X Input Device Extension Library

Mark Patrick

   Ardent Computer

George Sachs

   Hewlett-Packard

   X Version 11, Release 7.7

   Version 1.0

   Copyright © 1989, 1990, 1991 Hewlett-Packard Company, Ardent
   Computer

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   Table of Contents

   1. Input Extension

        Overview

              Design Approach
              Core Input Devices
              Extension Input Devices
              Using Extension Input Devices

        Library Extension Requests

              Window Manager Functions
              Events
              Event Handling Functions

   A. Input Extension Protocol Encoding

Chapter 1. Input Extension

   Table of Contents

   Overview

        Design Approach
        Core Input Devices
        Extension Input Devices
        Using Extension Input Devices

   Library Extension Requests

        Window Manager Functions
        Events
        Event Handling Functions

Overview

   This document describes an extension to the X11 server. The
   purpose of this extension is to support the use of additional
   input devices beyond the pointer and keyboard devices defined
   by the core X protocol. This first section gives an overview of
   the input extension. The following sections correspond to
   chapters 9, 10, and 11, ``Window and Session Manager
   Functions'', ``Events'', and ``Event Handling Functions'' of
   the ``Xlib - C Language Interface'' manual and describe how to
   use the input device extension.

Design Approach

   The design approach of the extension is to define functions and
   events analogous to the core functions and events. This allows
   extension input devices and events to be individually
   distinguishable from each other and from the core input devices
   and events. These functions and events make use of a device
   identifier and support the reporting of n-dimensional motion
   data as well as other data that is not currently reportable via
   the core input events.

Core Input Devices

   The X server core protocol supports two input devices: a
   pointer and a keyboard. The pointer device has two major
   functions. First, it may be used to generate motion information
   that client programs can detect. Second, it may also be used to
   indicate the current location and focus of the X keyboard. To
   accomplish this, the server echoes a cursor at the current
   position of the X pointer. Unless the X keyboard has been
   explicitly focused, this cursor also shows the current location
   and focus of the X keyboard.

   The X keyboard is used to generate input that client programs
   can detect.

   The X keyboard and X pointer are referred to in this document
   as the core devices, and the input events they generate (
   KeyPress , KeyRelease , ButtonPress , ButtonRelease , and
   MotionNotify ) are known as the core input events. All other
   input devices are referred to as extension input devices, and
   the input events they generate are referred to as extension
   input events. This input extension does not change the behavior
   or functionality of the core input devices, core events, or
   core protocol requests, with the exception of the core grab
   requests. These requests may affect the synchronization of
   events from extension devices. See the explanation in the
   section titled ``Event Synchronization and Core Grabs.''

   Selection of the physical devices to be initially used by the
   server as the core devices is left implementation dependent.
   Functions are defined that allow client programs to change
   which physical devices are used as the core devices.

Extension Input Devices

   The input extension controls access to input devices other than
   the X keyboard and X pointer. It allows client programs to
   select input from these devices independently from each other
   and independently from the core devices. Input events from
   these devices are of extension types ( DeviceKeyPress ,
   DeviceKeyRelease , DeviceButtonPress , DeviceButtonRelease ,
   DeviceMotionNotify , and so on) and contain a device identifier
   so that events of the same type coming from different input
   devices can be distinguished.

   Extension input events are not limited in size by the size of
   the server 32-byte wire events. Extension input events may be
   constructed by the server sending as many wire-sized events as
   necessary to return the information required for that event.
   The library event reformatting routines are responsible for
   combining these into one or more client XEvents.

   Any input device that generates key, button, or motion data may
   be used as an extension input device. Extension input devices
   may have zero or more keys, zero or more buttons, and may
   report zero or more axes of motion. Motion may be reported as
   relative movements from a previous position or as an absolute
   position. All valuators reporting motion information for a
   given extension input device must report the same kind of
   motion information (absolute or relative).

   This extension is designed to accommodate new types of input
   devices that may be added in the future. The protocol requests
   that refer to specific characteristics of input devices
   organize that information by input device classes. Server
   implementors may add new classes of input devices without
   changing the protocol requests.

   All extension input devices are treated like the core X
   keyboard in determining their location and focus. The server
   does not track the location of these devices on an individual
   basis and, therefore, does not echo a cursor to indicate their
   current location. Instead, their location is determined by the
   location of the core X pointer. Like the core X keyboard, some
   may be explicitly focused. If they are not explicitly focused,
   their focus is determined by the location of the core X
   pointer.

Input Device Classes

   Some of the input extension requests divide input devices into
   classes based on their functionality. This is intended to allow
   new classes of input devices to be defined at a later time
   without changing the semantics of these functions. The
   following input device classes are currently defined:

   KEY

   The device reports key events.

   BUTTON

   The device reports button events.

   VALUATOR

   The device reports valuator data in motion events.

   PROXIMITY

   The device reports proximity events.

   FOCUS

   The device can be focused.

   FEEDBACK

   The device supports feedbacks.

   Additional classes may be added in the future. Functions that
   support multiple input classes, such as the XListInputDevices
   function that lists all available input devices, organize the
   data they return by input class. Client programs that use these
   functions should not access data unless it matches a class
   defined at the time those clients were compiled. In this way,
   new classes can be added without forcing existing clients that
   use these functions to be recompiled.

Using Extension Input Devices

   A client that wishes to access an input device does so through
   the library functions defined in the following sections. A
   typical sequence of requests that a client would make is as
   follows:
     * XListInputDevices - lists all of the available input
       devices. From the information returned by this request,
       determine whether the desired input device is attached to
       the server. For a description of the XListInputDevices
       request, see the section entitled ``Listing Available
       Devices.''
     * XOpenDevice - requests that the server open the device for
       access by this client. This request returns an XDevice
       structure that is used by most other input extension
       requests to identify the specified device. For a
       description of the XOpenDevice request, see the section
       entitled ``Enabling and Disabling Extension Devices.''
     * Determine the event types and event classes needed to
       select the desired input extension events, and identify
       them when they are received. This is done via macros whose
       name corresponds to the desired event, for example,
       DeviceKeyPress . For a description of these macros, see the
       section entitled ``Selecting Extension Device Events.''
     * XSelectExtensionEvent - selects the desired events from the
       server. For a description of the XSelextExtensionEvent
       request, see the section entitled ``Selecting Extension
       Device Events.''
     * XNextEvent - receives the next available event. This is the
       core XNextEvent function provided by the standard X
       library.

   Other requests are defined to grab and focus extension devices,
   to change their key, button, or modifier mappings, to control
   the propagation of input extension events, to get motion
   history from an extension device, and to send input extension
   events to another client. These functions are described in the
   following sections.

Library Extension Requests

   Extension input devices are accessed by client programs through
   the use of new protocol requests. The following requests are
   provided as extensions to Xlib. Constants and structures
   referenced by these functions may be found in the files
   <X11/extensions/XI.h> and <X11/extensions/XInput.h>, which are
   attached to this document as Appendix A.

   The library will return NoSuchExtension if an extension request
   is made to a server that does not support the input extension.

   Input extension requests cannot be used to access the X
   keyboard and X pointer devices.

Window Manager Functions

   This section discusses the following X Input Extension Window
   Manager topics:
     * Changing the core devices
     * Event synchronization and core grabs
     * Extension active grabs
     * Passively grabbing a key
     * Passively grabbing a button
     * Thawing a device
     * Controlling device focus
     * Controlling device feedback
     * Ringing a bell on an input device
     * Controlling device encoding
     * Controlling button mapping
     * Obtaining the state of a device

Changing the Core Devices

   These functions are provided to change which physical device is
   used as the X pointer or X keyboard.

Note

   Using these functions may change the characteristics of the
   core devices. The new pointer device may have a different
   number of buttons from the old one, or the new keyboard device
   may have a different number of keys or report a different range
   of keycodes. Client programs may be running that depend on
   those characteristics. For example, a client program could
   allocate an array based on the number of buttons on the pointer
   device and then use the button numbers received in button
   events as indices into that array. Changing the core devices
   could cause such client programs to behave improperly or to
   terminate abnormally if they ignore the ChangeDeviceNotify
   event generated by these requests.

   These functions change the X keyboard or X pointer device and
   generate an XChangeDeviceNotify event and a MappingNotify
   event. The specified device becomes the new X keyboard or X
   pointer device. The location of the core device does not change
   as a result of this request.

   These requests fail and return AlreadyGrabbed if either the
   specified device or the core device it would replace are
   grabbed by some other client. They fail and return GrabFrozen
   if either device is frozen by the active grab of another
   client.

   These requests fail with a BadDevice error if the specified
   device is invalid, has not previously been opened via
   XOpenDevice , or is not supported as a core device by the
   server implementation.

   Once the device has successfully replaced one of the core
   devices, it is treated as a core device until it is in turn
   replaced by another ChangeDevice request or until the server
   terminates. The termination of the client that changed the
   device will not cause it to change back. Attempts to use the
   XCloseDevice request to close the new core device will fail
   with a BadDevice error.

   To change which physical device is used as the X keyboard, use
   the XChangeKeyboardDevice function. The specified device must
   support input class Keys (as reported in the ListInputDevices
   request) or the request will fail with a BadMatch error.

   int XChangeKeyboardDevice(Display *display, XDevice *device);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   If no error occurs, XChangeKeyboardDevice returns Success . A
   ChangeDeviceNotify event with the request field set to
   NewKeyboard is sent to all clients selecting that event. A
   MappingNotify event with the request field set to
   MappingKeyboard is sent to all clients. The requested device
   becomes the X keyboard, and the old keyboard becomes available
   as an extension input device. The focus state of the new
   keyboard is the same as the focus state of the old X keyboard.

   XChangeKeyboardDevice can generate AlreadyGrabbed , BadDevice ,
   BadMatch , and GrabFrozen errors.

   To change which physical device is used as the X pointer, use
   the XChangePointerDevice function. The specified device must
   support input class Valuators (as reported in the
   XListInputDevices request) and report at least two axes of
   motion, or the request will fail with a BadMatch error. If the
   specified device reports more than two axes, the two specified
   in the xaxis and yaxis arguments will be used. Data from other
   valuators on the device will be ignored.

   If the specified device reports absolute positional
   information, and the server implementation does not allow such
   a device to be used as the X pointer, the request will fail
   with a BadDevice error.

   int XChangePointerDevice(Display *display, XDevice *device, int
   xaxis, int yaxis);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   xaxis

   Specifies the zero-based index of the axis to be used as the
   x-axis of the pointer device.

   yaxis

   Specifies the zero-based index of the axis to be used as the
   y-axis of the pointer device.

   If no error occurs, XChangePointerDevice returns Success . A
   ChangeDeviceNotify event with the request field set to
   NewPointer is sent to all clients selecting that event. A
   MappingNotify event with the request field set to
   MappingPointer is sent to all clients. The requested device
   becomes the X pointer, and the old pointer becomes available as
   an extension input device.

   XChangePointerDevice can generate AlreadyGrabbed , BadDevice ,
   BadMatch , and GrabFrozen errors.

Event Synchronization and Core Grabs

   Implementation of the input extension requires an extension of
   the meaning of event synchronization for the core grab
   requests. This is necessary in order to allow window managers
   to freeze all input devices with a single request.

   The core grab requests require a pointer_mode and keyboard_mode
   argument. The meaning of these modes is changed by the input
   extension. For the XGrabPointer and XGrabButton requests,
   pointer_mode controls synchronization of the pointer device,
   and keyboard_mode controls the synchronization of all other
   input devices. For the XGrabKeyboard and XGrabKey requests,
   pointer_mode controls the synchronization of all input devices,
   except the X keyboard, while keyboard_mode controls the
   synchronization of the keyboard. When using one of the core
   grab requests, the synchronization of extension devices is
   controlled by the mode specified for the device not being
   grabbed.

Extension Active Grabs

   Active grabs of extension devices are supported via the
   XGrabDevice function in the same way that core devices are
   grabbed using the core XGrabKeyboard function, except that an
   extension input device is passed as a function parameter. The
   XUngrabDevice function allows a previous active grab for an
   extension device to be released.

   Passive grabs of buttons and keys on extension devices are
   supported via the XGrabDeviceButton and XGrabDeviceKey
   functions. These passive grabs are released via the
   XUngrabDeviceKey and XUngrabDeviceButton functions.

   To grab an extension device, use the XGrabDevice function. The
   device must have previously been opened using the XOpenDevice
   function.

   int XGrabDevice(Display *display, XDevice *device, Window
   grab_window, Bool owner_events, int event_count, XEventClass
   *event_list, int this_device_mode, int other_device_mode, Time
   time);

   "display"

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   grab_window

   Specifies the ID of a window associated with the device
   specified above.

   owner_events

   Specifies a boolean value of either True or False .

   event_count

   Specifies the number of elements in the event_list array.

   event_list

   Specifies a pointer to a list of event classes that indicate
   which events the client wishes to receive. These event classes
   must have been obtained using the device being grabbed.

   this_device_mode

   Controls further processing of events from this device. You can
   pass one of these constants: GrabModeSync or GrabModeAsync .

   other_device_mode

   Controls further processing of events from all other devices.
   You can pass one of these constants: GrabModeSync or
   GrabModeAsync .

   time

   Specifies the time. This may be either a timestamp expressed in
   milliseconds or CurrentTime .

   XGrabDevice actively grabs an extension input device and
   generates DeviceFocusIn and DeviceFocusOut events. Further
   input events from this device are reported only to the grabbing
   client. This function overrides any previous active grab by
   this client for this device.

   The event_list parameter is a pointer to a list of event
   classes. This list indicates which events the client wishes to
   receive while the grab is active. If owner_events is False ,
   input events from this device are reported with respect to
   grab_window and are reported only if specified in event_list.
   If owner_events is True , then if a generated event would
   normally be reported to this client, it is reported normally.
   Otherwise, the event is reported with respect to the
   grab_window and is only reported if specified in event_list.

   The this_device_mode argument controls the further processing
   of events from this device, and the other_device_mode argument
   controls the further processing of input events from all other
   devices.
     * If the this_device_mode argument is GrabModeAsync , device
       event processing continues normally; if the device is
       currently frozen by this client, then processing of device
       events is resumed. If the this_device_mode argument is
       GrabModeSync , the state of the grabbed device (as seen by
       client applications) appears to freeze, and no further
       device events are generated by the server until the
       grabbing client issues a releasing XAllowDeviceEvents call
       or until the device grab is released. Actual device input
       events are not lost while the device is frozen; they are
       simply queued for later processing.
     * If the other_device_mode is GrabModeAsync , event
       processing from other input devices is unaffected by
       activation of the grab. If other_device_mode is
       GrabModeSync , the state of all devices except the grabbed
       device (as seen by client applications) appears to freeze,
       and no further events are generated by the server until the
       grabbing client issues a releasing XAllowEvents or
       XAllowDeviceEvents call or until the device grab is
       released. Actual events are not lost while the other
       devices are frozen; they are simply queued for later
       processing.

   XGrabDevice fails on the following conditions:
     * If the device is actively grabbed by some other client, it
       returns AlreadyGrabbed .
     * If grab_window is not viewable, it returns GrabNotViewable
       .
     * If the specified time is earlier than the last-grab-time
       for the specified device or later than the current X server
       time, it returns GrabInvalidTime . Otherwise, the
       last-grab-time for the specified device is set to the
       specified time and CurrentTime is replaced by the current X
       server time.
     * If the device is frozen by an active grab of another
       client, it returns GrabFrozen .

   If a grabbed device is closed by a client while an active grab
   by that client is in effect, that active grab will be released.
   Any passive grabs established by that client will be released.
   If the device is frozen only by an active grab of the
   requesting client, it is thawed.

   XGrabDevice can generate BadClass , BadDevice , BadValue , and
   BadWindow errors.

   To release a grab of an extension device, use the XUngrabDevice
   function.

   int XUngrabDevice(Display *display, XDevice *device, Time
   time);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   time

   Specifies the time. This may be either a timestamp expressed in
   milliseconds, or CurrentTime .

   XUngrabDevice allows a client to release an extension input
   device and any queued events if this client has it grabbed from
   either XGrabDevice or XGrabDeviceKey . If any other devices are
   frozen by the grab, XUngrabDevice thaws them. This function
   does not release the device and any queued events if the
   specified time is earlier than the last-device-grab time or is
   later than the current X server time. It also generates
   DeviceFocusIn and DeviceFocusOut events. The X server
   automatically performs an XUngrabDevice if the event window for
   an active device grab becomes not viewable or if the client
   terminates without releasing the grab.

   XUngrabDevice can generate BadDevice errors.

Passively Grabbing a Key

   To passively grab a single key on an extension device, use
   XGrabDeviceKey . That device must have previously been opened
   using the XOpenDevice function, or the request will fail with a
   BadDevice error. If the specified device does not support input
   class Keys , the request will fail with a BadMatch error.

   int XGrabDeviceKey(Display *display, XDevice *device, int
   keycode, unsignedint modifiers, XDevice *modifier_device,
   Window grab_window, Bool owner_events, int event_count,
   XEventClass *event_list, int this_device_mode, int
   other_device_mode);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   keycode

   Specifies the keycode of the key that is to be grabbed. You can
   pass either the keycode or AnyKey .

   modifiers

   Specifies the set of keymasks. This mask is the bitwise
   inclusive OR of these keymask bits: ShiftMask , LockMask ,
   ControlMask , Mod1Mask , Mod2Mask , Mod3Mask , Mod4Mask , and
   Mod5Mask .

   You can also pass AnyModifier , which is equivalent to issuing
   the grab key request for all possible modifier combinations
   (including the combination of no modifiers).

   modifier_device

   Specifies the device whose modifiers are to be used. If NULL is
   specified, the core X keyboard is used as the modifier_device.

   grab_window

   Specifies the ID of a window associated with the device
   specified above.

   owner_events

   Specifies a boolean value of either True or False .

   event_count

   Specifies the number of elements in the event_list array.

   event_list

   Specifies a pointer to a list of event classes that indicate
   which events the client wishes to receive.

   this_device_mode

   Controls further processing of events from this device. You can
   pass one of these constants: GrabModeSync or GrabModeAsync .

   other_device_mode

   Controls further processing of events from all other devices.
   You can pass one of these constants: GrabModeSync or
   GrabModeAsync .

   XGrabDeviceKey is analogous to the core XGrabKey function. It
   creates an explicit passive grab for a key on an extension
   device. The XGrabDeviceKey function establishes a passive grab
   on a device. Consequently, in the future,
     * IF the device is not grabbed and the specified key, which
       itself can be a modifier key, is logically pressed when the
       specified modifier keys logically are down on the specified
       modifier device (and no other keys are down),
     * AND no other modifier keys logically are down,
     * AND EITHER the grab window is an ancestor of (or is) the
       focus window or the grab window is a descendent of the
       focus window and contains the pointer,
     * AND a passive grab on the same device and key combination
       does not exist on any ancestor of the grab window,
     * THEN the device is actively grabbed, as for XGrabDevice ,
       the last-device-grab time is set to the time at which the
       key was pressed (as transmitted in the DeviceKeyPress
       event), and the DeviceKeyPress event is reported.

   The interpretation of the remaining arguments is as for
   XGrabDevice . The active grab is terminated automatically when
   the logical state of the device has the specified key released
   (independent of the logical state of the modifier keys).

   Note that the logical state of a device (as seen by means of
   the X protocol) may lag the physical state if device event
   processing is frozen.

   A modifier of AnyModifier is equivalent to issuing the request
   for all possible modifier combinations (including the
   combination of no modifiers). It is not required that all
   modifiers specified have currently assigned keycodes. A key of
   AnyKey is equivalent to issuing the request for all possible
   keycodes. Otherwise, the key must be in the range specified by
   min_keycode and max_keycode in the information returned by the
   XListInputDevices function. If it is not within that range,
   XGrabDeviceKey generates a BadValue error.

   XGrabDeviceKey generates a BadAccess error if some other client
   has issued a XGrabDeviceKey with the same device and key
   combination on the same window. When using AnyModifier or
   AnyKey , the request fails completely and the X server
   generates a BadAccess error, and no grabs are established if
   there is a conflicting grab for any combination.

   XGrabDeviceKey returns Success upon successful completion of
   the request.

   XGrabDeviceKey can generate BadAccess , BadClass , BadDevice ,
   BadMatch , BadValue , and BadWindow errors.

   To release a passive grab of a single key on an extension
   device, use XUngrabDeviceKey .

   int XUngrabDeviceKey(Display *display, XDevice *device, int
   keycode, unsignedint modifiers, XDevice *modifier_device,
   Window ungrab_window);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   keycode

   Specifies the keycode of the key that is to be ungrabbed. You
   can pass either the keycode or AnyKey .

   modifiers

   Specifies the set of keymasks. This mask is the bitwise
   inclusive OR of these keymask bits: ShiftMask , LockMask ,
   ControlMask , Mod1Mask , Mod2Mask , Mod3Mask , Mod4Mask , and
   Mod5Mask .

   You can also pass AnyModifier , which is equivalent to issuing
   the ungrab key request for all possible modifier combinations
   (including the combination of no modifiers).

   modifier_device

   Specifies the device whose modifiers are to be used. If NULL is
   specified, the core X keyboard is used as the modifier_device.

   ungrab_window

   Specifies the ID of a window associated with the device
   specified above.

   XUngrabDeviceKey is analogous to the core XUngrabKey function.
   It releases an explicit passive grab for a key on an extension
   input device.

   XUngrabDeviceKey can generate BadAlloc , BadDevice , BadMatch ,
   BadValue , and BadWindow errors.

Passively Grabbing a Button

   To establish a passive grab for a single button on an extension
   device, use XGrabDeviceButton . The specified device must have
   previously been opened using the XOpenDevice function, or the
   request will fail with a BadDevice error. If the specified
   device does not support input class Buttons , the request will
   fail with a BadMatch error.

   int XGrabDeviceButton(Display *display, XDevice *device,
   unsignedint button, unsignedint modifiers,
   XDevice*modifier_device , Window grab_window, Bool
   owner_events, int event_count, XEventClass *event_list, int
   this_device_mode, int other_device_mode);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   button

   Specifies the code of the button that is to be grabbed. You can
   pass either the button or AnyButton .

   modifiers

   Specifies the set of keymasks. This mask is the bitwise
   inclusive OR of these keymask bits: ShiftMask , LockMask ,
   ControlMask , Mod1Mask , Mod2Mask , Mod3Mask , Mod4Mask , and
   Mod5Mask .

   You can also pass AnyModifier , which is equivalent to issuing
   the grab request for all possible modifier combinations
   (including the combination of no modifiers).

   modifier_device

   Specifies the device whose modifiers are to be used. If NULL is
   specified, the core X keyboard is used as the modifier_device.

   grab_window

   Specifies the ID of a window associated with the device
   specified above.

   owner_events

   Specifies a boolean value of either True or False .

   event_count

   Specifies the number of elements in the event_list array.

   event_list

   Specifies a list of event classes that indicates which device
   events are to be reported to the client.

   this_device_mode

   Controls further processing of events from this device. You can
   pass one of these constants: GrabModeSync or GrabModeAsync .

   other_device_mode

   Controls further processing of events from all other devices.
   You can pass one of these constants: GrabModeSync or
   GrabModeAsync .

   XGrabDeviceButton is analogous to the core XGrabButton
   function. It creates an explicit passive grab for a button on
   an extension input device. Because the server does not track
   extension devices, no cursor is specified with this request.
   For the same reason, there is no confine_to parameter. The
   device must have previously been opened using the XOpenDevice
   function.

   The XGrabDeviceButton function establishes a passive grab on a
   device. Consequently, in the future,
     * IF the device is not grabbed and the specified button is
       logically pressed when the specified modifier keys
       logically are down (and no other buttons or modifier keys
       are down),
     * AND EITHER the grab window is an ancestor of (or is) the
       focus window OR the grab window is a descendent of the
       focus window and contains the pointer,
     * AND a passive grab on the same device and button/key
       combination does not exist on any ancestor of the grab
       window,
     * THEN the device is actively grabbed, as for XGrabDevice ,
       the last-grab time is set to the time at which the button
       was pressed (as transmitted in the DeviceButtonPress
       event), and the DeviceButtonPress event is reported.

   The interpretation of the remaining arguments is as for
   XGrabDevice . The active grab is terminated automatically when
   logical state of the device has all buttons released
   (independent of the logical state of the modifier keys).

   Note that the logical state of a device (as seen by means of
   the X protocol) may lag the physical state if device event
   processing is frozen.

   A modifier of AnyModifier is equivalent to issuing the request
   for all possible modifier combinations (including the
   combination of no modifiers). It is not required that all
   modifiers specified have currently assigned keycodes. A button
   of AnyButton is equivalent to issuing the request for all
   possible buttons. Otherwise, it is not required that the
   specified button be assigned to a physical button.

   XGrabDeviceButton generates a BadAccess error if some other
   client has issued a XGrabDeviceButton with the same device and
   button combination on the same window. When using AnyModifier
   or AnyButton , the request fails completely and the X server
   generates a BadAccess error and no grabs are established if
   there is a conflicting grab for any combination.

   XGrabDeviceButton can generate BadAccess , BadClass , BadDevice
   , BadMatch , BadValue , and BadWindow errors.

   To release a passive grab of a button on an extension device,
   use XUngrabDeviceButton .

   int XUngrabDeviceButton(Display *display, XDevice *device,
   unsignedint button, unsignedint modifiers, XDevice
   *modifier_device, Window ungrab_window);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   button

   Specifies the code of the button that is to be ungrabbed. You
   can pass either a button or AnyButton .

   modifiers

   Specifies the set of keymasks. This mask is the bitwise
   inclusive OR of these keymask bits: ShiftMask , LockMask ,
   ControlMask , Mod1Mask , Mod2Mask , Mod3Mask , Mod4Mask , and
   Mod5Mask .

   You can also pass AnyModifier , which is equivalent to issuing
   the ungrab key request for all possible modifier combinations
   (including the combination of no modifiers).

   modifier_device

   Specifies the device whose modifiers are to be used. If NULL is
   specified, the core X keyboard is used as the modifier_device.

   ungrab_window

   Specifies the ID of a window associated with the device
   specified above.

   XUngrabDeviceButton is analogous to the core XUngrabButton
   function. It releases an explicit passive grab for a button on
   an extension device. That device must have previously been
   opened using the XOpenDevice function, or a BadDevice error
   will result.

   A modifier of AnyModifier is equivalent to issuing the request
   for all possible modifier combinations (including the
   combination of no modifiers).

   XUngrabDeviceButton can generate BadAlloc , BadDevice ,
   BadMatch , BadValue , and BadWindow errors.

Thawing a Device

   To allow further events to be processed when a device has been
   frozen, use XAllowDeviceEvents .

   int XAllowDeviceEvents(Display *display, XDevice *device, int
   event_mode, Time time);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   event_mode

   Specifies the event mode. You can pass one of these constants:
   AsyncThisDevice , SyncThisDevice , AsyncOtherDevices ,
   ReplayThisDevice , AsyncAll , or SyncAll .

   time

   Specifies the time. This may be either a timestamp expressed in
   milliseconds, or CurrentTime .

   XAllowDeviceEvents releases some queued events if the client
   has caused a device to freeze. It has no effect if the
   specified time is earlier than the last-grab time of the most
   recent active grab for the client and device, or if the
   specified time is later than the current X server time. The
   following describes the processing that occurs depending on
   what constant you pass to the event_mode argument:
     * AsyncThisDevice
     * If the specified device is frozen by the client, event
       processing for that continues as usual. If the device is
       frozen multiple times by the client on behalf of multiple
       separate grabs, AsyncThisDevice thaws for all.
       AsyncThisDevice has no effect if the specified device is
       not frozen by the client, but the device need not be
       grabbed by the client.
     * SyncThisDevice
     * If the specified device is frozen and actively grabbed by
       the client, event processing for that device continues
       normally until the next key or button event is reported to
       the client. At this time, the specified device again
       appears to freeze. However, if the reported event causes
       the grab to be released, the specified device does not
       freeze. SyncThisDevice has no effect if the specified
       device is not frozen by the client or is not grabbed by the
       client.
     * ReplayThisDevice
     * If the specified device is actively grabbed by the client
       and is frozen as the result of an event having been sent to
       the client (either from the activation of a
       GrabDeviceButton or from a previous AllowDeviceEvents with
       mode SyncThisDevice , but not from a Grab ), the grab is
       released and that event is completely reprocessed. This
       time, however, the request ignores any passive grabs at or
       above (toward the root) the grab-window of the grab just
       released. The request has no effect if the specified device
       is not grabbed by the client or if it is not frozen as the
       result of an event.
     * AsyncOtherDevices
     * If the remaining devices are frozen by the client, event
       processing for them continues as usual. If the other
       devices are frozen multiple times by the client on behalf
       of multiple separate grabs, AsyncOtherDevices ``thaws'' for
       all. AsyncOtherDevices has no effect if the devices are not
       frozen by the client, but those devices need not be grabbed
       by the client.
     * SyncAll
     * If all devices are frozen by the client, event processing
       (for all devices) continues normally until the next button
       or key event is reported to the client for a grabbed
       device, at which time the devices again appear to freeze.
       However, if the reported event causes the grab to be
       released, then the devices do not freeze (but if any device
       is still grabbed, then a subsequent event for it will still
       cause all devices to freeze). SyncAll has no effect unless
       all devices are frozen by the client. If any device is
       frozen twice by the client on behalf of two separate grabs,
       SyncAll "thaws" for both (but a subsequent freeze for
       SyncAll will freeze each device only once).
     * AsyncAll
     * If all devices are frozen by the client, event processing
       (for all devices) continues normally. If any device is
       frozen multiple times by the client on behalf of multiple
       separate grabs, AsyncAll ``thaws ''for all. If any device
       is frozen twice by the client on behalf of two separate
       grabs, AsyncAll ``thaws'' for both. AsyncAll has no effect
       unless all devices are frozen by the client.

   AsyncThisDevice , SyncThisDevice , and ReplayThisDevice have no
   effect on the processing of events from the remaining devices.
   AsyncOtherDevices has no effect on the processing of events
   from the specified device. When the event_mode is SyncAll or
   AsyncAll , the device parameter is ignored.

   It is possible for several grabs of different devices (by the
   same or different clients) to be active simultaneously. If a
   device is frozen on behalf of any grab, no event processing is
   performed for the device. It is possible for a single device to
   be frozen because of several grabs. In this case, the freeze
   must be released on behalf of each grab before events can again
   be processed.

   XAllowDeviceEvents can generate BadDevice and BadValue errors.

Controlling Device Focus

   The current focus window for an extension input device can be
   determined using the XGetDeviceFocus function. Extension
   devices are focused using the XSetDeviceFocus function in the
   same way that the keyboard is focused using the core
   XSetInputFocus function, except that a device ID is passed as a
   function parameter. One additional focus state, FollowKeyboard
   , is provided for extension devices.

   To get the current focus state, revert state, and focus time of
   an extension device, use XGetDeviceFocus .

   int XGetDeviceFocus(Display *display, XDevice *device, Window
   *focus_return, int *revert_to_return, Time *focus_time_return);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   focus_return

   Specifies the address of a variable into which the server can
   return the ID of the window that contains the device focus or
   one of the constants None , PointerRoot , or FollowKeyboard .

   revert_to_return

   Specifies the address of a variable into which the server can
   return the current revert_to status for the device.

   focus_time_return

   Specifies the address of a variable into which the server can
   return the focus time last set for the device.

   XGetDeviceFocus returns the focus state, the revert-to state,
   and the last-focus-time for an extension input device.

   XGetDeviceFocus can generate BadDevice and BadMatch errors.

   To set the focus of an extension device, use XSetDeviceFocus .

   int XSetDeviceFocus(Display *display, XDevice *device, Window
   focus, int revert_to, Time time);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   focus

   Specifies the ID of the window to which the device's focus
   should be set. This may be a window ID, or PointerRoot ,
   FollowKeyboard , or None .

   revert_to

   Specifies to which window the focus of the device should revert
   if the focus window becomes not viewable. One of the following
   constants may be passed: RevertToParent , RevertToPointerRoot ,
   RevertToNone , or RevertToFollowKeyboard .

   time

   Specifies the time. You can pass either a timestamp, expressed
   in milliseconds, or CurrentTime .

   XSetDeviceFocus changes the focus for an extension input device
   and the last-focus-change-time. It has no effect if the
   specified time is earlier than the last-focus-change-time or is
   later than the current X server time. Otherwise, the
   last-focus-change-time is set to the specified time. This
   function causes the X server to generate DeviceFocusIn and
   DeviceFocusOut events.

   The action taken by the server when this function is requested
   depends on the value of the focus argument:
     * If the focus argument is None , all input events from this
       device will be discarded until a new focus window is set.
       In this case, the revert_to argument is ignored.
     * If the focus argument is a window ID, it becomes the focus
       window of the device. If an input event from the device
       would normally be reported to this window or to one of its
       inferiors, the event is reported normally. Otherwise, the
       event is reported relative to the focus window.
     * If the focus argument is PointerRoot , the focus window is
       dynamically taken to be the root window of whatever screen
       the pointer is on at each input event. In this case, the
       revert_to argument is ignored.
     * If the focus argument is FollowKeyboard , the focus window
       is dynamically taken to be the same as the focus of the X
       keyboard at each input event.

   The specified focus window must be viewable at the time
   XSetDeviceFocus is called. Otherwise, it generates a BadMatch
   error. If the focus window later becomes not viewable, the X
   server evaluates the revert_to argument to determine the new
   focus window.
     * If the revert_to argument is RevertToParent , the focus
       reverts to the parent (or the closest viewable ancestor),
       and the new revert_to value is taken to be RevertToNone .
     * If the revert_to argument is RevertToPointerRoot ,
       RevertToFollowKeyboard , or RevertToNone , the focus
       reverts to that value.

   When the focus reverts, the X server generates DeviceFocusIn
   and DeviceFocusOut events, but the last-focus-change time is
   not affected.

   XSetDeviceFocus can generate BadDevice , BadMatch , BadValue ,
   and BadWindow errors.

Controlling Device Feedback

   To determine the current feedback settings of an extension
   input device, use XGetFeedbackControl .

   XFeedbackState * XGetFeedbackControl(Display *display, XDevice
   *device, int *num_feedbacks_return);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   num_feedbacks_return

   Returns the number of feedbacks supported by the device.

   XGetFeedbackControl returns a list of FeedbackState structures
   that describe the feedbacks supported by the specified device.
   There is an XFeedbackState structure for each class of
   feedback. These are of variable length, but the first three
   members are common to all.



typedef struct {
     XID class;
     int length;
     XID id;
} XFeedbackState;

   The common members are as follows:
     * The class member identifies the class of feedback. It may
       be compared to constants defined in the file <
       X11/extensions/XI.h >. Currently defined feedback constants
       include: KbdFeedbackClass , PtrFeedbackClass ,
       StringFeedbackClass , IntegerFeedbackClass ,
       LedFeedbackClass , and BellFeedbackClass .
     * The length member specifies the length of the FeedbackState
       structure and can be used by clients to traverse the list.
     * The id member uniquely identifies a feedback for a given
       device and class. This allows a device to support more than
       one feedback of the same class. Other feedbacks of other
       classes or devices may have the same ID.

   Those feedbacks equivalent to those supported by the core
   keyboard are reported in class KbdFeedback using the
   XKbdFeedbackState structure, which is defined as follows:



typedef struct {
     XID class;
     int length;
     XID id;
     int click;
     int percent;
     int pitch;
     int duration;
     int led_mask;
     int global_auto_repeat;
     char auto_repeats[32];
} XKbdFeedbackState;

   The additional members of the XKbdFeedbackState structure
   report the current state of the feedback:
     * The click member specifies the key-click volume and has a
       value in the range 0 (off) to 100 (loud).
     * The percent member specifies the bell volume and has a
       value in the range 0 (off) to 100 (loud).
     * The pitch member specifies the bell pitch in Hz. The range
       of the value is implementation-dependent.
     * The duration member specifies the duration in milliseconds
       of the bell.
     * The led_mask member is a bit mask that describes the
       current state of up to 32 LEDs. A value of 1 in a bit
       indicates that the corresponding LED is on.
     * The global_auto_repeat member has a value of
       AutoRepeatModeOn or AutoRepeatModeOff .
     * The auto_repeats member is a bit vector. Each bit set to 1
       indicates that auto-repeat is enabled for the corresponding
       key. The vector is represented as 32 bytes. Byte N (from 0)
       contains the bits for keys 8N to 8N + 7, with the least
       significant bit in the byte representing key 8N.

   Those feedbacks equivalent to those supported by the core
   pointer are reported in class PtrFeedback using the
   XPtrFeedbackState structure, which is defined as follows:



typedef struct {
     XID class;
     int length;
     XID id;
     int accelNum;
     int accelDenom;
     int threshold;
} XPtrFeedbackState;

   The additional members of the XPtrFeedbackState structure
   report the current state of the feedback:
     * The accelNum member returns the numerator for the
       acceleration multiplier.
     * The accelDenom member returns the denominator for the
       acceleration multiplier.
     * The accelDenom member returns the threshold for the
       acceleration.

   Integer feedbacks are those capable of displaying integer
   numbers and reported via the XIntegerFeedbackState structure.
   The minimum and maximum values that they can display are
   reported.



typedef struct {
     XID class;
     int length;
     XID id;
     int resolution;
     int minVal;
     int maxVal;
} XIntegerFeedbackState;

   The additional members of the XIntegerFeedbackState structure
   report the capabilities of the feedback:
     * The resolution member specifies the number of digits that
       the feedback can display.
     * The minVal member specifies the minimum value that the
       feedback can display.
     * The maxVal specifies the maximum value that the feedback
       can display.

   String feedbacks are those that can display character
   information and are reported via the XStringFeedbackState
   structure. Clients set these feedbacks by passing a list of
   KeySyms to be displayed. The XGetFeedbackControl function
   returns the set of key symbols that the feedback can display,
   as well as the maximum number of symbols that can be displayed.
   The XStringFeedbackState structure is defined as follows:



typedef struct {
     XID class;
     int length;
     XID id;
     int max_symbols;
     int  num_syms_supported;
     KeySym *syms_supported;
} XStringFeedbackState;

   The additional members of the XStringFeedbackState structure
   report the capabilities of the feedback:
     * The max_symbols member specifies the maximum number of
       symbols that can be displayed.
     * The syms_supported member is a pointer to the list of
       supported symbols.
     * The num_syms_supported member specifies the length of the
       list of supported symbols.

   Bell feedbacks are those that can generate a sound and are
   reported via the XBellFeedbackState structure. Some
   implementations may support a bell as part of a KbdFeedback
   feedback. Class BellFeedback is provided for implementations
   that do not choose to do so and for devices that support
   multiple feedbacks that can produce sound. The meaning of the
   members is the same as that of the corresponding fields in the
   XKbdFeedbackState structure.



typedef struct {
     XID class;
     int length;
     XID id;
     int percent;
     int pitch;
     int duration;
} XBellFeedbackState;

   Led feedbacks are those that can generate a light and are
   reported via the XLedFeedbackState structure. Up to 32 lights
   per feedback are supported. Each bit in led_mask corresponds to
   one supported light, and the corresponding bit in led_values
   indicates whether that light is currently on (1) or off (0).
   Some implementations may support leds as part of a KbdFeedback
   feedback. Class LedFeedback is provided for implementations
   that do not choose to do so and for devices that support
   multiple led feedbacks.



typedef struct {
     XID class;
     int length;
     XID id;
     Mask led_values;
     Mask led_mask;
} XLedFeedbackState;

   XGetFeedbackControl can generate BadDevice and BadMatch errors.

   To free the information returned by the XGetFeedbackControl
   function, use XFreeFeedbackList .

   void XFreeFeedbackList(XFeedbackState *list);

   list

   Specifies the pointer to the XFeedbackState structure returned
   by a previous call to XGetFeedbackControl .

   XFreeFeedbackList frees the list of feedback control
   information.

   To change the settings of a feedback on an extension device,
   use XChangeFeedbackControl . This function modifies the current
   control values of the specified feedback using information
   passed in the appropriate XFeedbackControl structure for the
   feedback. Which values are modified depends on the valuemask
   passed.

   int XChangeFeedbackControl(Display *display, XDevice *device,
   unsignedlong valuemask, XFeedbackControl *value);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   valuemask

   Specifies one value for each bit in the mask (least to most
   significant bit). The values are associated with the feedbacks
   for the specified device.

   value

   Specifies a pointer to the XFeedbackControl structure.

   XChangeFeedbackControl controls the device characteristics
   described by the XFeedbackControl structure. There is an
   XFeedbackControl structure for each class of feedback. These
   are of variable length, but the first three members are common
   to all and are as follows:



typedef struct {
     XID class;
     int length;
     XID id;
} XFeedbackControl;

   Feedback class KbdFeedback controls feedbacks equivalent to
   those provided by the core keyboard using the
   KbdFeedbackControl structure, which is defined as follows:.



typedef struct {
     XID class;
     int length;
     XID id;
     int click;
     int percent;
     int pitch;
     int duration;
     int led_mask;
     int led_value;
     int key;
     int auto_repeat_mode;
} XKbdFeedbackControl;

   This class controls the device characteristics described by the
   XKbdFeedbackControl structure. These include the
   key_click_percent, global_auto_repeat, and individual key
   auto-repeat. Valid modes are AutoRepeatModeOn ,
   AutoRepeatModeOff , and AutoRepeatModeDefault .

   Valid masks are as follows:

#define   DvKeyClickPercent           (1><<0)
#define   DvPercent                   (1><<0)
#define   DvPitch                     (1><<0)
#define   DvDuration                  (1><<0)
#define   DvLed                       (1><<0)
#define   DvLedMode                   (1><<0)
#define   DvKey                       (1><<0)
#define   DvAutoRepeatMode            (1><<0)

   Feedback class PtrFeedback controls feedbacks equivalent to
   those provided by the core pointer using the PtrFeedbackControl
   structure, which is defined as follows:



typedef struct {
     XID class;
     int length;
     XID id;
     int accelNum;
     int accelDenom;
     int threshold;
} XPtrFeedbackControl;

   Which values are modified depends on the valuemask passed.

   Valid masks are as follows:
#define    DvAccelnum        (1L<<0)
#define    DvAccelDenom      (1L<<1)
#define    DvThreshold       (1L<<2)

   The acceleration, expressed as a fraction, is a multiplier for
   movement. For example, specifying 3/1 means that the device
   moves three times as fast as normal. The fraction may be
   rounded arbitrarily by the X server. Acceleration takes effect
   only if the device moves more than threshold pixels at once and
   applies only to the amount beyond the value in the threshold
   argument. Setting a value to -1 restores the default. The
   values of the accelNumerator and threshold fields must be
   nonzero for the pointer values to be set. Otherwise, the
   parameters will be unchanged. Negative values generate a
   BadValue error, as does a zero value for the accelDenominator
   field.

   This request fails with a BadMatch error if the specified
   device is not currently reporting relative motion. If a device
   that is capable of reporting both relative and absolute motion
   has its mode changed from Relative to Absolute by an
   XSetDeviceMode request, valuator control values will be ignored
   by the server while the device is in that mode.

   Feedback class IntegerFeedback controls integer feedbacks
   displayed on input devices and are reported via the
   IntegerFeedbackControl structure, which is defined as follows:



typedef struct {
     XID class;
     int length;
     XID id;
     int int_to_display;
} XIntegerFeedbackControl;

   Valid masks are as follows:

#define   DvInteger           (1L<<0)

   Feedback class StringFeedback controls string feedbacks
   displayed on input devices and reported via the
   StringFeedbackControl structure, which is defined as follows:



typedef struct {
     XID class;
     int length;
     XID id;
     int num_keysyms;
     KeySym *syms_to_display;
} XStringFeedbackControl;

   Valid masks are as follows:

#define   DvString           (1L<<0)

   Feedback class BellFeedback controls a bell on an input device
   and is reported via the BellFeedbackControl structure, which is
   defined as follows:



typedef struct {
     XID class;
     int length;
     XID id;
     int percent;
     int pitch;
     int duration;
} XBellFeedbackControl;

   Valid masks are as follows:

#define   DvPercent                   (1L<<1)
#define   DvPitch                     (1L<<2)
#define   DvDuration                  (1L<<3)

   Feedback class LedFeedback controls lights on an input device
   and are reported via the LedFeedbackControl structure, which is
   defined as follows:



typedef struct {
     XID class;
     int length;
     XID id;
     int led_mask;
     int led_values;
} XLedFeedbackControl;

   Valid masks are as follows:

#define   DvLed                       (1L<<4)
#define   DvLedMode                   (1L<<5)

   XChangeFeedbackControl can generate BadDevice , BadFeedBack ,
   BadMatch , and BadValue errors.

Ringing a Bell on an Input Device

   To ring a bell on an extension input device, use XDeviceBell .

   int XDeviceBell(Display *display, XDevice *device,
   XIDfeedbackclass, feedbackid, int percent);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   feedbackclass

   Specifies the feedbackclass. Valid values are KbdFeedbackClass
   and BellFeedbackClass .

   feedbackid

   Specifies the ID of the feedback that has the bell.

   percent

   Specifies the volume in the range -100 (quiet) to 100 percent
   (loud).

   XDeviceBell is analogous to the core XBell function. It rings
   the specified bell on the specified input device feedback,
   using the specified volume. The specified volume is relative to
   the base volume for the feedback. If the value for the percent
   argument is not in the range -100 to 100 inclusive, a BadValue
   error results. The volume at which the bell rings when the
   percent argument is nonnegative is:

       base - [(base * percent) / 100] + percent

   The volume at which the bell rings when the percent argument is
   negative is:

       base + [(base * percent) / 100]

   To change the base volume of the bell, use
   XChangeFeedbackControl .

   XDeviceBell can generate BadDevice and BadValue errors.

Controlling Device Encoding

   To get the key mapping of an extension device that supports
   input class Keys , use XGetDeviceKeyMapping .

   KeySym * XGetDeviceKeyMapping(Display *display, XDevice
   *device, KeyCode first_keycode_wanted, int keycode_count, int
   *keysyms_per_keycode_return);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   first_keycode_wanted

   Specifies the first keycode that is to be returned.

   keycode_count

   Specifies the number of keycodes that are to be returned.

   keysyms_per_keycode_return

   Returns the number of keysyms per keycode.

   XGetDeviceKeyMapping is analogous to the core
   XGetKeyboardMapping function. It returns the symbols for the
   specified number of keycodes for the specified extension
   device.

   XGetDeviceKeyMapping returns the symbols for the specified
   number of keycodes for the specified extension device, starting
   with the specified keycode. The first_keycode_wanted must be
   greater than or equal to min-keycode as returned by the
   XListInputDevices request (else a BadValue error results). The
   following value:
first_keycode_wanted + keycode_count - 1

   must be less than or equal to max-keycode as returned by the
   XListInputDevices request (else a BadValue error results).

   The number of elements in the keysyms list is as follows:
keycode_count * keysyms_per_keycode_return

   And KEYSYM number N (counting from zero) for keycode K has an
   index (counting from zero), in keysyms, of the following:
(K - first_keycode_wanted) * keysyms_per_keycode_return + N

   The keysyms_per_keycode_return value is chosen arbitrarily by
   the server to be large enough to report all requested symbols.
   A special KEYSYM value of NoSymbol is used to fill in unused
   elements for individual keycodes.

   To free the data returned by this function, use XFree.

   If the specified device has not first been opened by this
   client via XOpenDevice , this request will fail with a
   BadDevice error. If that device does not support input class
   Keys , this request will fail with a BadMatch error.

   XGetDeviceKeyMapping can generate BadDevice , BadMatch , and
   BadValue errors.

   To change the keyboard mapping of an extension device that
   supports input class Keys , use XChangeDeviceKeyMapping .

   int XChangeDeviceKeyMapping(Display *display, XDevice *device,
   int first_keycode, int keysyms_per_keycode, KeySym *keysyms,
   int num_codes);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   first_keycode

   Specifies the first keycode that is to be changed.

   keysyms_per_keycode

   Specifies the keysyms that are to be used.

   keysyms

   Specifies a pointer to an array of keysyms.

   num_codes

   Specifies the number of keycodes that are to be changed.

   XChangeDeviceKeyMapping is analogous to the core
   XChangeKeyboardMapping function. It defines the symbols for the
   specified number of keycodes for the specified extension
   keyboard device.

   If the specified device has not first been opened by this
   client via XOpenDevice , this request will fail with a
   BadDevice error. If the specified device does not support input
   class Keys , this request will fail with a BadMatch error.

   The number of elements in the keysyms list must be a multiple
   of keysyms_per_keycode. Otherwise, XChangeDeviceKeyMapping
   generates a BadLength error. The specified first_keycode must
   be greater than or equal to the min_keycode value returned by
   the ListInputDevices request, or this request will fail with a
   BadValue error. In addition, if the following expression is not
   less than the max_keycode value returned by the
   ListInputDevices request, the request will fail with a BadValue
   error:
       first_keycode + (num_codes / keysyms_per_keycode) - 1

   XChangeDeviceKeyMapping can generate BadAlloc , BadDevice ,
   BadMatch , and BadValue errors.

   To obtain the keycodes that are used as modifiers on an
   extension device that supports input class Keys , use
   XGetDeviceModifierMapping .

   XModifierKeymap * XGetDeviceModifierMapping(Display *display,
   XDevice *device);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   XGetDeviceModifierMapping is analogous to the core
   XGetModifierMapping function. The XGetDeviceModifierMapping
   function returns a newly created XModifierKeymap structure that
   contains the keys being used as modifiers for the specified
   device. The structure should be freed after use with
   XFreeModifierMapping . If only zero values appear in the set
   for any modifier, that modifier is disabled.

   XGetDeviceModifierMapping can generate BadDevice and BadMatch
   errors.

   To set which keycodes are to be used as modifiers for an
   extension device, use XSetDeviceModifierMapping .

   int XSetDeviceModifierMapping(Display *display, XDevice
   *device, XModifierKeymap *modmap);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   modmap

   Specifies a pointer to the XModifierKeymap structure.

   XSetDeviceModifierMapping is analogous to the core
   XSetModifierMapping function. The XSetDeviceModifierMapping
   function specifies the keycodes of the keys, if any, that are
   to be used as modifiers. A zero value means that no key should
   be used. No two arguments can have the same nonzero keycode
   value. Otherwise, XSetDeviceModifierMapping generates a
   BadValue error. There are eight modifiers, and the modifiermap
   member of the XModifierKeymap structure contains eight sets of
   max_keypermod keycodes, one for each modifier in the order
   Shift , Lock , Control , Mod1 , Mod2 , Mod3 , Mod4 , and Mod5 .
   Only nonzero keycodes have meaning in each set, and zero
   keycodes are ignored. In addition, all of the nonzero keycodes
   must be in the range specified by min_keycode and max_keycode
   reported by the XListInputDevices function. Otherwise,
   XSetModifierMapping generates a BadValue error. No keycode may
   appear twice in the entire map. Otherwise, it generates a
   BadValue error.

   A X server can impose restrictions on how modifiers can be
   changed, for example, if certain keys do not generate up
   transitions in hardware or if multiple modifier keys are not
   supported. If some such restriction is violated, the status
   reply is MappingFailed , and none of the modifiers are changed.
   If the new keycodes specified for a modifier differ from those
   currently defined and any (current or new) keys for that
   modifier are in the logically down state, the status reply is
   MappingBusy , and none of the modifiers are changed.
   XSetModifierMapping generates a DeviceMappingNotify event on a
   MappingSuccess status.

   XSetDeviceModifierMapping can generate BadAlloc , BadDevice ,
   BadMatch , and BadValue errors.

Controlling Button Mapping

   To set the mapping of the buttons on an extension device, use
   XSetDeviceButtonMapping .

   int XSetDeviceButtonMapping(Display *display, XDevice *device,
   unsignedchar map[], int nmap);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   map

   Specifies the mapping list.

   nmap

   Specifies the number of items in the mapping list.

   XSetDeviceButtonMapping sets the mapping of the buttons on an
   extension device. If it succeeds, the X server generates a
   DeviceMappingNotify event, and XSetDeviceButtonMapping returns
   MappingSuccess . Elements of the list are indexed starting from
   one. The length of the list must be the same as
   XGetDeviceButtonMapping would return, or a BadValue error
   results. The index is a button number, and the element of the
   list defines the effective number. A zero element disables a
   button, and elements are not restricted in value by the number
   of physical buttons. However, no two elements can have the same
   nonzero value, or a BadValue error results. If any of the
   buttons to be altered are logically in the down state,
   XSetDeviceButtonMapping returns MappingBusy , and the mapping
   is not changed.

   XSetDeviceButtonMapping can generate BadDevice , BadMatch , and
   BadValue errors.

   To get the button mapping, use XGetDeviceButtonMapping .

   int XGetDeviceButtonMapping(Display *display, XDevice *device,
   unsignedchar map_return[], int nmap);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   map_return

   Specifies the mapping list.

   nmap

   Specifies the number of items in the mapping list.

   XGetDeviceButtonMapping returns the current mapping of the
   specified extension device. Elements of the list are indexed
   starting from one. XGetDeviceButtonMapping returns the number
   of physical buttons actually on the pointer. The nominal
   mapping for the buttons is the identity mapping: map[i]=i. The
   nmap argument specifies the length of the array where the
   button mapping is returned, and only the first nmap elements
   are returned in map_return.

   XGetDeviceButtonMapping can generate BadDevice and BadMatch
   errors.

Obtaining the State of a Device

   To obtain information that describes the state of the keys,
   buttons, and valuators of an extension device, use
   XQueryDeviceState .

   XDeviceState * XQueryDeviceState(Display *display, XDevice
   *device);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   XQueryDeviceState returns a pointer to an XDeviceState
   structure, which points to a list of structures that describe
   the state of the keys, buttons, and valuators on the device:



typedef struct {
     XID device_id;
     int num_classes;
     XInputClass *data;
} XDeviceState;

   The structures are of variable length, but the first two
   members are common to all and are as follows:



typedef struct {
     unsigned char class;
     unsigned char length;
} XInputClass;

   The class member contains a class identifier. This identifier
   can be compared with constants defined in the file <
   X11/extensions/XI.h >. Currently defined constants are:
   KeyClass , ButtonClass , and ValuatorClass .

   The length member contains the length of the structure and can
   be used by clients to traverse the list.

   The XValuatorState structure describes the current state of the
   valuators on the device. The num_valuators member contains the
   number of valuators on the device. The mode member is a mask
   whose bits report the data mode and other state information for
   the device. The following bits are currently defined:


     DeviceMode     1 << 0     Relative = 0, Absolute = 1
     ProximityState     1 << 1     InProximity = 0, OutOfProximity = 1

   The valuators member contains a pointer to an array of integers
   that describe the current value of the valuators. If the mode
   is Relative , these values are undefined.



typedef struct {
     unsigned char class;
     unsigned char length;
     unsigned char num_valuators;
     unsigned char mode;
     int *valuators;
} XValuatorState;

   The XKeyState structure describes the current state of the keys
   on the device. Byte N (from 0) contains the bits for key 8N to
   8N + 7 with the least significant bit in the byte representing
   key 8N.



typedef struct {
     unsigned char class;
     unsigned char length;
     short num_keys;
     char keys[32];
} XKeyState;

   The XButtonState structure describes the current state of the
   buttons on the device. Byte N (from 0) contains the bits for
   button 8N to 8N + 7 with the least significant bit in the byte
   representing button 8N.



typedef struct {
     unsigned char class;
     unsigned char length;
     short num_buttons;
     char buttons[32];
} XButtonState;

   XQueryDeviceState can generate BadDevice errors.

   To free the data returned by this function, use
   XFreeDeviceState .

   void XFreeDeviceState(XDeviceState *state);

   state

   Specifies the pointer to the XDeviceState data returned by a
   previous call to XQueryDeviceState .

   XFreeDeviceState frees the device state data.

Events

   The input extension creates input events analogous to the core
   input events. These extension input events are generated by
   manipulating one of the extension input devices. The remainder
   of this section discusses the following X Input Extension event
   topics:
     * Event types
     * Event classes
     * Event structures

Event Types

   Event types are integer numbers that a client can use to
   determine what kind of event it has received. The client
   compares the type field of the event structure with known event
   types to make this determination.

   The core input event types are constants and are defined in the
   header file < X11/X.h >. Extension event types are not
   constants. Instead, they are dynamically allocated by the
   extension's request to the X server when the extension is
   initialized. Because of this, extension event types must be
   obtained by the client from the server.

   The client program determines the event type for an extension
   event by using the information returned by the XOpenDevice
   request. This type can then be used for comparison with the
   type field of events received by the client.

   Extension events propagate up the window hierarchy in the same
   manner as core events. If a window is not interested in an
   extension event, it usually propagates to the closest ancestor
   that is interested, unless the dont_propagate list prohibits
   it. Grabs of extension devices may alter the set of windows
   that receive a particular extension event.

   The following table lists the event category and its associated
   event type or types.
        Event Category           Event Type
          Device key           DeviceKeyPress
                              DeviceKeyRelease
         Device motion        DeviceButtonPress
                             DeviceButtonRelease
                             DeviceMotionNotify
      Device input focus        DeviceFocusIn
                               DeviceFocusOut
   Device state notification  DeviceStateNotify
       Device proximity          ProximityIn
                                ProximityOut
        Device mapping       DeviceMappingNotify
         Device change       ChangeDeviceNotify

Event Classes

   Event classes are integer numbers that are used in the same way
   as the core event masks. They are used by a client program to
   indicate to the server which events that client program wishes
   to receive.

   The core input event masks are constants and are defined in the
   header file < X11/X.h >. Extension event classes are not
   constants. Instead, they are dynamically allocated by the
   extension's request to the X server when the extension is
   initialized. Because of this, extension event classes must be
   obtained by the client from the server.

   The event class for an extension event and device is obtained
   from information returned by the XOpenDevice function. This
   class can then be used in an XSelectExtensionEvent request to
   ask that events of that type from that device be sent to the
   client program.

   For DeviceButtonPress events, the client may specify whether or
   not an implicit passive grab should be done when the button is
   pressed. If the client wants to guarantee that it will receive
   a DeviceButtonRelease event for each DeviceButtonPress event it
   receives, it should specify the DeviceButtonPressGrab class in
   addition to the DeviceButtonPress class. This restricts the
   client in that only one client at a time may request
   DeviceButtonPress events from the same device and window if any
   client specifies this class.

   If any client has specified the DeviceButtonPressGrab class,
   any requests by any other client that specify the same device
   and window and specify either DeviceButtonPress or
   DeviceButtonPressGrab will cause an Access error to be
   generated.

   If only the DeviceButtonPress class is specified, no implicit
   passive grab will be done when a button is pressed on the
   device. Multiple clients may use this class to specify the same
   device and window combination.

   The client may also select DeviceMotion events only when a
   button is down. It does this by specifying the event classes
   DeviceButton1Motion through DeviceButton5Motion . An input
   device will support only as many button motion classes as it
   has buttons.

Event Structures

   Each extension event type has a corresponding structure
   declared in < X11/extensions/XInput.h >. All event structures
   have the following common members:

   type

   Set to the event type number that uniquely identifies it. For
   example, when the X server reports a DeviceKeyPress event to a
   client application, it sends an XDeviceKeyPressEvent structure.

   serial

   Set from the serial number reported in the protocol but
   expanded from the 16-bit least significant bits to a full
   32-bit value.

   send_event

   Set to True if the event came from an XSendEvent request.

   display

   Set to a pointer to a structure that defines the display on
   which the event was read.

   Extension event structures report the current position of the X
   pointer. In addition, if the device reports motion data and is
   reporting absolute data, the current value of any valuators the
   device contains is also reported.

Device Key Events

   Key events from extension devices contain all the information
   that is contained in a key event from the X keyboard. In
   addition, they contain a device ID and report the current value
   of any valuators on the device, if that device is reporting
   absolute data. If data for more than six valuators is being
   reported, more than one key event will be sent. The axes_count
   member contains the number of axes that are being reported. The
   server sends as many of these events as are needed to report
   the device data. Each event contains the total number of axes
   reported in the axes_count member and the first axis reported
   in the current event in the first_axis member. If the device
   supports input class Valuators , but is not reporting absolute
   mode data, the axes_count member contains zero (0).

   The location reported in the x, y and x_root, y_root members is
   the location of the core X pointer.

   The XDeviceKeyEvent structure is defined as follows:



typedef struct {
     int type;                      /* of event */
     unsigned long serial;          /* # of last request processed */
     Bool send_event;               /* true if from SendEvent request */
     Display *display;              /* Display the event was read from *
/
     Window window;                 /* "event" window reported relative
to */
     XID deviceid;
     Window root;                   /* root window event occurred on */
     Window subwindow;              /* child window */
     Time time;                     /* milliseconds */
     int x, y;                      /* x, y coordinates in event window
*/
     int x_root;                    /* coordinates relative to root */
     int y_root;                    /* coordinates relative to root */
     unsigned int state;            /* key or button mask */
     unsigned int keycode;          /* detail */
     Bool same_screen;              /* same screen flag */
     unsigned int device_state;     /* device key or button mask */
     unsigned char axes_count;
     unsigned char first_axis;
     int axis_data[6];
} XDeviceKeyEvent;

typedef XDeviceKeyEvent XDeviceKeyPressedEvent;
typedef XDeviceKeyEvent XDeviceKeyReleasedEvent;

Device Button Events

   Button events from extension devices contain all the
   information that is contained in a button event from the X
   pointer. In addition, they contain a device ID and report the
   current value of any valuators on the device if that device is
   reporting absolute data. If data for more than six valuators is
   being reported, more than one button event may be sent. The
   axes_count member contains the number of axes that are being
   reported. The server sends as many of these events as are
   needed to report the device data. Each event contains the total
   number of axes reported in the axes_count member and the first
   axis reported in the current event in the first_axis member. If
   the device supports input class Valuators , but is not
   reporting absolute mode data, the axes_count member contains
   zero (0).

   The location reported in the x, y and x_root, y_root members is
   the location of the core X pointer.



typedef struct {
     int type;                      /* of event */
     unsigned long serial;          /* # of last request processed by se
rver */
     Bool send_event;               /* true if from a SendEvent request
*/
     Display *display;              /* Display the event was read from *
/
     Window window;                 /* "event" window reported relative
to */
     XID deviceid;
     Window root;                   /* root window that the event occurr
ed on */
     Window subwindow;              /* child window */
     Time time;                     /* milliseconds */
     int x, y;                      /* x, y coordinates in event window
*/
     int x_root;                    /* coordinates relative to root */
     int y_root;                    /* coordinates relative to root */
     unsigned int state;            /* key or button mask */
     unsigned int button;           /* detail */
     Bool same_screen;              /* same screen flag */
     unsigned int device_state;     /* device key or button mask */
     unsigned char axes_count;
     unsigned char first_axis;
     int axis_data[6];
} XDeviceButtonEvent;

typedef XDeviceButtonEvent XDeviceButtonPressedEvent;
typedef XDeviceButtonEvent XDeviceButtonReleasedEvent;

Device Motion Events

   Motion events from extension devices contain all the
   information that is contained in a motion event from the X
   pointer. In addition, they contain a device ID and report the
   current value of any valuators on the device.

   The location reported in the x, y and x_root, y_root members is
   the location of the core X pointer, and so is 2-dimensional.

   Extension motion devices may report motion data for a variable
   number of axes. The axes_count member contains the number of
   axes that are being reported. The server sends as many of these
   events as are needed to report the device data. Each event
   contains the total number of axes reported in the axes_count
   member and the first axis reported in the current event in the
   first_axis member.



typedef struct {
     int type;                          /* of event */
     unsigned long serial;              /* # of last request processed b
y server */
     Bool send_event;                   /* true if from a SendEvent requ
est */
     Display *display;                  /* Display the event was read fr
om */
     Window window;                     /* "event" window reported relat
ive to */
     XID deviceid;
     Window root;                       /* root window that the event oc
curred on */
     Window subwindow;                  /* child window */
     Time time;                         /* milliseconds */
     int x, y;                          /* x, y coordinates in event win
dow */
     int x_root;                        /* coordinates relative to root
*/
     int y_root;                        /* coordinates relative to root
*/
     unsigned int state;                /* key or button mask */
     char is_hint;                      /* detail */
     Bool same_screen;                  /* same screen flag */
     unsigned int device_state;         /* device key or button mask */
     unsigned char axes_count;
     unsigned char first_axis;
     int axis_data[6];
} XDeviceMotionEvent;

Device Focus Events

   These events are equivalent to the core focus events. They
   contain the same information, with the addition of a device ID
   to identify which device has had a focus change, and a
   timestamp.

   DeviceFocusIn and DeviceFocusOut events are generated for focus
   changes of extension devices in the same manner as core focus
   events are generated.



typedef struct {
     int type;                      /* of event */
     unsigned long serial;          /* # of last request processed by se
rver */
     Bool send_event;               /* true if this came from a SendEven
t request */
     Display *display;              /* Display the event was read from *
/
     Window window;                 /* "event" window it is reported rel
ative to */
     XID deviceid;
     int mode;                      /* NotifyNormal, NotifyGrab, NotifyU
ngrab */
     int detail;
                                    /*
                                     * NotifyAncestor, NotifyVirtual, No
tifyInferior,
                                     * NotifyNonLinear,NotifyNonLinearVi
rtual, NotifyPointer,
                                     * NotifyPointerRoot, NotifyDetailNo
ne
                                     */
     Time time;
} XDeviceFocusChangeEvent;

typedef XDeviceFocusChangeEvent XDeviceFocusInEvent;
typedef XDeviceFocusChangeEvent XDeviceFocusOutEvent;

Device StateNotify Event

   This event is analogous to the core keymap event but reports
   the current state of the device for each input class that it
   supports. It is generated after every DeviceFocusIn event and
   EnterNotify event and is delivered to clients who have selected
   XDeviceStateNotify events.

   If the device supports input class Valuators , the mode member
   in the XValuatorStatus structure is a bitmask that reports the
   device mode, proximity state, and other state information. The
   following bits are currently defined:


     0x01     Relative = 0, Absolute = 1
     0x02     InProximity = 0, OutOfProximity = 1

   If the device supports more valuators than can be reported in a
   single XEvent , multiple XDeviceStateNotify events will be
   generated.



typedef struct {
     unsigned char class;
     unsigned char length;
} XInputClass;

typedef struct {
     int type;
     unsigned long serial;     /* # of last request processed by server
*/
     Bool send_event;          /* true if this came from a SendEvent req
uest */
     Display *display;         /* Display the event was read from */
     Window window;
     XID deviceid;
     Time time;
     int num_classes;
     char data[64];
} XDeviceStateNotifyEvent;

typedef struct {
     unsigned char class;
     unsigned char length;
     unsigned char num_valuators;
     unsigned char mode;
     int valuators[6];
} XValuatorStatus;

typedef struct {
     unsigned char class;
     unsigned char length;
     short num_keys;
     char keys[32];
} XKeyStatus;

typedef struct {
     unsigned char class;
     unsigned char length;
     short num_buttons;
     char buttons[32];
} XButtonStatus;

Device Mapping Event

   This event is equivalent to the core MappingNotify event. It
   notifies client programs when the mapping of keys, modifiers,
   or buttons on an extension device has changed.



typedef struct {
     int type;
     unsigned long serial;
     Bool send_event;
     Display *display;
     Window window;
     XID deviceid;
     Time time;
     int request;
     int first_keycode;
     int count;
} XDeviceMappingEvent;

ChangeDeviceNotify Event

   This event has no equivalent in the core protocol. It notifies
   client programs when one of the core devices has been changed.



typedef struct {
     int type;
     unsigned long serial;
     Bool send_event;
     Display *display;
     Window window;
     XID deviceid;
     Time time;
     int request;
} XChangeDeviceNotifyEvent;

Proximity Events

   These events have no equivalent in the core protocol. Some
   input devices such as graphics tablets or touchscreens may send
   these events to indicate that a stylus has moved into or out of
   contact with a positional sensing surface.

   The event contains the current value of any valuators on the
   device if that device is reporting absolute data. If data for
   more than six valuators is being reported, more than one
   proximity event may be sent. The axes_count member contains the
   number of axes that are being reported. The server sends as
   many of these events as are needed to report the device data.
   Each event contains the total number of axes reported in the
   axes_count member and the first axis reported in the current
   event in the first_axis member. If the device supports input
   class Valuators , but is not reporting absolute mode data, the
   axes_count member contains zero (0).



typedef struct {
     int type;                 /* ProximityIn or ProximityOut */
     unsigned long serial;     /* # of last request processed by server
*/
     Bool send_event;          /* true if this came from a SendEvent req
uest */
     Display *display;         /* Display the event was read from */
     Window window;
     XID deviceid;
     Window root;
     Window subwindow;
     Time time;
     int x, y;
     int x_root, y_root;
     unsigned int state;
     Bool same_screen;
     unsigned int device_state;   /* device key or button mask */
     unsigned char axes_count;
     unsigned char first_axis;
     int axis_data[6];
} XProximityNotifyEvent;

typedef XProximityNotifyEvent XProximityInEvent;
typedef XProximityNotifyEvent XProximityOutEvent;

Event Handling Functions

   This section discusses the X Input Extension event handling
   functions that allow you to:
     * Determine the extension version
     * List the available devices
     * Enable and disable extension devices
     * Change the mode of a device
     * Initialize valuators on an input device
     * Get input device controls
     * Change input device controls
     * Select extension device events
     * Determine selected device events
     * Control event propagation
     * Send an event
     * Get motion history

Determining the Extension Version

   XExtensionVersion * XGetExtensionVersion(Display *display, char
   *name);

   display

   Specifies the connection to the X server.

   name

   Specifies the name of the desired extension.

   XGetExtensionVersion allows a client to determine whether a
   server supports the desired version of the input extension.

   The XExtensionVersion structure returns information about the
   version of the extension supported by the server and is defined
   as follows:



typedef struct {
     Bool present;
     short major_version;
     short minor_version;
} XExtensionVersion;

   The major and minor versions can be compared with constants
   defined in the header file < X11/extensions/XI.h >. Each
   version is a superset of the previous versions.

   You should use XFree. to free the data returned by this
   function.

Listing Available Devices

   A client program that wishes to access a specific device must
   first determine whether that device is connected to the X
   server. This is done through the XListInputDevices function,
   which will return a list of all devices that can be opened by
   the X server. The client program can use one of the names
   defined in the < X11/extensions/XI.h > header file in an
   XInternAtom request to determine the device type of the desired
   device. This type can then be compared with the device types
   returned by the XListInputDevices request.

   XDeviceInfo * XListInputDevices(Display *display, int
   *ndevices);

   display

   Specifies the connection to the X server.

   ndevices

   Specifies the address of a variable into which the server can
   return the number of input devices available to the X server.

   XListInputDevices allows a client to determine which devices
   are available for X input and information about those devices.
   An array of XDeviceInfo structures is returned, with one
   element in the array for each device. The number of devices is
   returned in the ndevices argument.

   The X pointer device and X keyboard device are reported, as
   well as all available extension input devices. The use member
   of the XDeviceInfo structure specifies the current use of the
   device. If the value of this member is IsXPointer , the device
   is the X pointer device. If the value is IsXKeyboard , the
   device is the X keyboard device. If the value is
   IsXExtensionDevice , the device is available for use as an
   extension input device.

   Each XDeviceInfo entry contains a pointer to a list of
   structures that describe the characteristics of each class of
   input supported by that device. The num_classes member contains
   the number of entries in that list.

   If the device supports input class Valuators , one of the
   structures pointed to by the XDeviceInfo structure will be an
   XValuatorInfo structure. The axes member of that structure
   contains the address of an array of XAxisInfo structures. There
   is one element in this array for each axis of motion reported
   by the device. The number of elements in this array is
   contained in the num_axes element of the XValuatorInfo
   structure. The size of the motion buffer for the device is
   reported in the motion_buffer member of the XValuatorInfo
   structure.

   The XDeviceInfo structure is defined as follows:



typedef struct _XDeviceInfo {
     XID id;
     Atom type;
     char *name;
     int num_classes;
     int use;
     XAnyClassPtr inputclassinfo;
} XDeviceInfo;

   The structures pointed to by the XDeviceInfo structure are
   defined as follows:



typedef struct _XKeyInfo {
     XID class;
     int length;
     unsigned short min_keycode;
     unsigned short max_keycode;
     unsigned short num_keys;
} XKeyInfo;

typedef struct _XButtonInfo {
     XID class;
     int length;
     short num_buttons;
} XButtonInfo;

typedef struct _XValuatorInfo {
     XID class;
     int length;
     unsigned char num_axes;
     unsigned char mode;
     unsigned long motion_buffer;
     XAxisInfoPtr axes;
} XValuatorInfo;

   The XAxisInfo structure pointed to by the XValuatorInfo
   structure is defined as follows:



typedef struct _XAxisInfo {
     int resolution;
     int min_value;
     int max_value;
} XAxisInfo;

   The following atom names are defined in the <
   X11/extensions/XI.h > header file.


MOUSE     QUADRATURE
TABLET     SPACEBALL
KEYBOARD     DATAGLOVE
TOUCHSCREEN     EYETRACKER
TOUCHPAD     CURSORKEYS
BUTTONBOX     FOOTMOUSE
BARCODE     ID_MODULE
KNOB_BOX     ONE_KNOB
TRACKBALL     NINE_KNOB\s+1

   These names can be used in an XInternAtom request to return an
   atom that can be used for comparison with the type member of
   the XDeviceInfo structure.

   XListInputDevices returns NULL if there are no input devices to
   list.

   To free the data returned by XListInputDevices , use
   XFreeDeviceList .

   void XFreeDeviceList(XDeviceInfo *list);

   list

   Specifies the pointer to the XDeviceInfo array returned by a
   previous call to XListInputDevices .

   XFreeDeviceList frees the list of input device information.

Enabling and Disabling Extension Devices

   Each client program that wishes to access an extension device
   must request that the server open that device by calling the
   XOpenDevice function.

   XDevice * XOpenDevice(Display *display, XID device_id);

   display

   Specifies the connection to the X server.

   device_id

   Specifies the ID that uniquely identifies the device to be
   opened. This ID is obtained from the XListInputDevices request.

   XOpenDevice opens the device for the requesting client and, on
   success, returns an XDevice structure, which is defined as
   follows:



typedef struct {
     XID device_id;
     int num_classes;
     XInputClassInfo *classes;
} XDevice;

   The XDevice structure contains a pointer to an array of
   XInputClassInfo structures. Each element in that array contains
   information about events of a particular input class supported
   by the input device.

   The XInputClassInfo structure is defined as follows:



typedef struct {
     unsigned char input_class;
     unsigned char event_type_base;
} XInputClassInfo;

   A client program can determine the event type and event class
   for a given event by using macros defined by the input
   extension. The name of the macro corresponds to the desired
   event, and the macro is passed the structure that describes the
   device from which input is desired, for example:



     DeviceKeyPress(XDevice *device, event_type, event_class)

   The macro will fill in the values of the event class to be used
   in an XSelectExtensionEvent request to select the event and the
   event type to be used in comparing with the event types of
   events received via XNextEvent.

   XOpenDevice can generate BadDevice errors.

   Before terminating, the client program should request that the
   server close the device by calling the XCloseDevice function.

   int XCloseDevice(Display *display, XDevice *device);

   display

   Specifies the connection to the X server.

   device

   Specifies the device to be closed.

   XCloseDevice closes the device for the requesting client and
   frees the associated XDevice structure.

   A client may open the same extension device more than once.
   Requests after the first successful one return an additional
   XDevice structure with the same information as the first, but
   otherwise have no effect. A single XCloseDevice request will
   terminate that client's access to the device.

   Closing a device releases any active or passive grabs the
   requesting client has established. If the device is frozen only
   by an active grab of the requesting client, any queued events
   are released.

   If a client program terminates without closing a device, the
   server will automatically close that device on behalf of the
   client. This does not affect any other clients that may be
   accessing that device.

   XCloseDevice can generate BadDevice errors.

Changing the Mode of a Device

   Some devices are capable of reporting either relative or
   absolute motion data. To change the mode of a device from
   relative to absolute, use XSetDeviceMode .

   int XSetDeviceMode(Display *display, XDevice *device, int
   mode);

   display

   Specifies the connection to the X server.

   device

   Specifies the device whose mode should be changed.

   mode

   Specifies the mode. You can pass Absolute or Relative .

   XSetDeviceMode allows a client to request the server to change
   the mode of a device that is capable of reporting either
   absolute positional data or relative motion data. If the device
   is invalid or if the client has not previously requested that
   the server open the device via an XOpenDevice request, this
   request will fail with a BadDevice error. If the device does
   not support input class Valuators or if it is not capable of
   reporting the specified mode, the request will fail with a
   BadMatch error.

   This request will fail and return DeviceBusy if another client
   has already opened the device and requested a different mode.

   XSetDeviceMode can generate BadDevice , BadMatch , BadMode ,
   and DeviceBusy errors.

Initializing Valuators on an Input Device

   Some devices that report absolute positional data can be
   initialized to a starting value. Devices that are capable of
   reporting relative motion or absolute positional data may
   require that their valuators be initialized to a starting value
   after the mode of the device is changed to Absolute .

   To initialize the valuators on such a device, use
   XSetDeviceValuators .

   Status XSetDeviceValuators(Display *display, XDevice *device,
   int*valuators,first_valuator, num_valuators);

   display

   Specifies the connection to the X server.

   device

   Specifies the device whose valuators should be initialized.

   valuators

   Specifies the values to which each valuator should be set.

   first_valuator

   Specifies the first valuator to be set.

   num_valuators

   Specifies the number of valuators to be set.

   XSetDeviceValuators initializes the specified valuators on the
   specified extension input device. Valuators are numbered
   beginning with zero. Only the valuators in the range specified
   by first_valuator and num_valuators are set. A BadValue error
   results if the number of valuators supported by the device is
   less than the following expression:


     first_valuator + num_valuators

   If the request succeeds, Success is returned. If the specified
   device is grabbed by some other client, the request will fail
   and a status of AlreadyGrabbed will be returned.

   XSetDeviceValuators can generate BadDevice , BadLength ,
   BadMatch , and BadValue errors.

Getting Input Device Controls

   Some input devices support various configuration controls that
   can be queried or changed by clients. The set of supported
   controls will vary from one input device to another. Requests
   to manipulate these controls will fail if either the target X
   server or the target input device does not support the
   requested device control.

   Each device control has a unique identifier. Information passed
   with each device control varies in length and is mapped by data
   structures unique to that device control.

   To query a device control, use XGetDeviceControl .

   XDeviceControl * XGetDeviceControl(Display *display, XDevice
   *device, int control);

   display

   Specifies the connection to the X server.

   device

   Specifies the device whose configuration control status is to
   be returned.

   control

   Identifies the specific device control to be queried.

   XGetDeviceControl returns the current state of the specified
   device control. If the target X server does not support that
   device control, a BadValue error is returned. If the specified
   device does not support that device control, a BadMatch error
   is returned.

   If the request is successful, a pointer to a generic
   XDeviceState structure is returned. The information returned
   varies according to the specified control and is mapped by a
   structure appropriate for that control. The first two members
   are common to all device controls and are defined as follows:



typedef struct {
     XID control;
     int length;
} XDeviceState;
\fP

   The control may be compared to constants defined in the file <
   X11/extensions/XI.h >. Currently defined device controls
   include DEVICE_RESOLUTION.

   The information returned for the DEVICE_RESOLUTION control is
   defined in the XDeviceResolutionState structure, which is
   defined as follows:



typedef struct {
     XID control;
     int length;
     int num_valuators;
     int *resolutions;
     int *min_resolutions;
     int *max_resolutions;
} XDeviceResolutionState;

   This device control returns a list of valuators and the range
   of valid resolutions allowed for each. Valuators are numbered
   beginning with zero (0). Resolutions for all valuators on the
   device are returned. For each valuator i on the device,
   resolutions[i] returns the current setting of the resolution,
   min_resolutions[i] returns the minimum valid setting, and
   max_resolutions[i] returns the maximum valid setting.

   When this control is specified, XGetDeviceControl fails with a
   BadMatch error if the specified device has no valuators.

   XGetDeviceControl can generate BadMatch and BadValue errors.

Changing Input Device Controls

   Some input devices support various configuration controls that
   can be changed by clients. Typically, this would be done to
   initialize the device to a known state or configuration. The
   set of supported controls will vary from one input device to
   another. Requests to manipulate these controls will fail if
   either the target X server or the target input device does not
   support the requested device control. Setting the device
   control will also fail if the target input device is grabbed by
   another client or is open by another client and has been set to
   a conflicting state.

   Each device control has a unique identifier. Information passed
   with each device control varies in length and is mapped by data
   structures unique to that device control.

   To change a device control, use XChangeDeviceControl .

   Status XChangeDeviceControl(Display *display, XDevice *device,
   int control, XDeviceControl *value);

   display

   Specifies the connection to the X server.

   device

   Specifies the device whose configuration control status is to
   be modified.

   control

   Identifies the specific device control to be changed.

   value

   Specifies a pointer to an XDeviceControl structure that
   describes which control is to be changed and how it is to be
   changed.

   XChangeDeviceControl changes the current state of the specified
   device control. If the target X server does not support that
   device control, a BadValue error is returned. If the specified
   device does not support that device control, a BadMatch error
   is returned. If another client has the target device grabbed, a
   status of AlreadyGrabbed is returned. If another client has the
   device open and has set it to a conflicting state, a status of
   DeviceBusy is returned. If the request fails for any reason,
   the device control will not be changed.

   If the request is successful, the device control will be
   changed and a status of Success is returned. The information
   passed varies according to the specified control and is mapped
   by a structure appropriate for that control. The first two
   members are common to all device controls:



typedef struct {
     XID control;
     int length;
} XDeviceControl;

   The control may be set using constants defined in the <
   X11/extensions/XI.h > header file. Currently defined device
   controls include DEVICE_RESOLUTION.

   The information that can be changed by the DEVICE_RESOLUTION
   control is defined in the XDeviceResolutionControl structure,
   which is defined as follows:



typedef struct {
     XID control;
     int length;
     int first_valuator;
     int num_valuators;
     int *resolutions;
} XDeviceResolutionControl;

   This device control changes the resolution of the specified
   valuators on the specified extension input device. Valuators
   are numbered beginning with zero. Only the valuators in the
   range specified by first_valuator and num_valuators are set. A
   value of -1 in the resolutions list indicates that the
   resolution for this valuator is not to be changed. The
   num_valuators member specifies the number of valuators in the
   resolutions list.

   When this control is specified, XChangeDeviceControl fails with
   a BadMatch error if the specified device has no valuators. If a
   resolution is specified that is not within the range of valid
   values (as returned by XGetDeviceControl ),
   XChangeDeviceControl fails with a BadValue error. A BadValue
   error results if the number of valuators supported by the
   device is less than the following expression:



     first_valuator + num_valuators,

   XChangeDeviceControl can generate BadMatch and BadValue errors.

Selecting Extension Device Events

   To select device input events, use XSelectExtensionEvent . The
   parameters passed are a pointer to a list of classes that
   define the desired event types and devices, a count of the
   number of elements in the list, and the ID of the window from
   which events are desired.

   int XSelectExtensionEvent(Display *display, Window window,
   XEventClass *event_list, int event_count);

   display

   Specifies the connection to the X server.

   window

   Specifies the ID of the window from which the client wishes to
   receive events.

   event_list

   Specifies a pointer to an array of event classes that specify
   which events are desired.

   event_count

   Specifies the number of elements in the event_list.

   XSelectExtensionEvent requests the server to send events that
   match the events and devices described by the event list and
   that come from the requested window. The elements of the
   XEventClass array are the event_class values obtained by
   invoking a macro with the pointer to an XDevice structure
   returned by the XOpenDevice request. For example, the
   DeviceKeyPress macro would return the XEventClass for
   DeviceKeyPress events from the specified device if it were
   invoked in the following form:


     DeviceKeyPress (XDevice *device, event_type, event_class)

   Macros are defined for the following event classes:
DeviceKeyPress
DeviceKeyRelease
DeviceButtonPress
DeviceButtonRelease
DeviceMotionNotify
DeviceFocusIn
DeviceFocusOut
ProximityIn
ProximityOut
DeviceStateNotify
DeviceMappingNotify
ChangeDeviceNotify
DevicePointerMotionHint
DeviceButton1Motion
DeviceButton2Motion
DeviceButton3Motion,
DeviceButton4Motion
DeviceButton5Motion
DeviceButtonMotion,
DeviceOwnerGrabButton
DeviceButtonPressGrab

   To get the next available event from within a client program,
   use the core XNextEvent function. This returns the next event
   whether it came from a core device or an extension device.

   Succeeding XSelectExtensionEvent requests using event classes
   for the same device as was specified on a previous request will
   replace the previous set of selected events from that device
   with the new set.

   XSelectExtensionEvent can generate BadAccess , BadClass ,
   BadLength , and BadWindow errors.

Determining Selected Device Events

   To determine which extension events are currently selected from
   a given window, use XGetSelectedExtensionEvents .

   int XGetSelectedExtensionEvents(Display *display, Window
   window, int *this_client_count, XEventClass **this_client, int
   *all_clients_count, XEventClass **all_clients);

   display

   Specifies the connection to the X server.

   window

   Specifies the ID of the window from which the client wishes to
   receive events.

   this_client_count

   Returns the number of elements in the this_client list.

   this_client

   Returns a list of XEventClasses that specify which events are
   selected by this client.

   all_clients_count

   Returns the number of elements in the all_clients list.

   all_clients

   Returns a list of XEventClasses that specify which events are
   selected by all clients.

   XGetSelectedExtensionEvents returns pointers to two event class
   arrays. One lists the extension events selected by this client
   from the specified window. The other lists the extension events
   selected by all clients from the specified window. This
   information is analogous to that returned in your_event_mask
   and all_event_masks of the XWindowAttributes structure when an
   XGetWindowAttributes request is made. To free the two arrays
   returned by this function, use XFree.

   XGetSelectedExtensionEvents can generate BadWindow errors.

Controlling Event Propagation

   Extension events propagate up the window hierarchy in the same
   manner as core events. If a window is not interested in an
   extension event, it usually propagates to the closest ancestor
   that is interested, unless the dont_propagate list prohibits
   it. Grabs of extension devices may alter the set of windows
   that receive a particular extension event.

   Client programs may control event propagation through the use
   of the following two functions: XChangeDeviceDontPropagateList
   and XGetDeviceDontPropagateList .

   int XChangeDeviceDontPropagateList(Display *display, Window
   window, int event_count, XEventClass *events, int mode);

   display

   Specifies the connection to the X server.

   window

   Specifies the desired window.

   event_count

   Specifies the number of elements in the events list.

   events

   Specifies a pointer to the list of XEventClasses.

   mode

   Specifies the mode. You can pass AddToList or DeleteFromList .

   XChangeDeviceDontPropagateList adds an event to or deletes an
   event from the do_not_propagate list of extension events for
   the specified window. There is one list per window, and the
   list remains for the life of the window. The list is not
   altered if a client that changed the list terminates.

   Suppression of event propagation is not allowed for all events.
   If a specified XEventClass is invalid because suppression of
   that event is not allowed, a BadClass error results.

   XChangeDeviceDontPropagateList can generate BadClass , BadMode
   , and BadWindow errors.

   XEventClass * XGetDeviceDontPropagateList(Display *display,
   Window window, int *event_count);

   display

   Specifies the connection to the X server.

   window

   Specifies the desired window.

   event_count

   Returns the number of elements in the array returned by this
   function.

   XGetDeviceDontPropagateList allows a client to determine the
   do_not_propagate list of extension events for the specified
   window. It returns an array of XEventClass , each XEventClass
   representing a device/event type pair. To free the data
   returned by this function, use XFree.

   XGetDeviceDontPropagateList can generate BadWindow errors.

Sending an Event

   To send an extension event to another client, use
   XSendExtensionEvent .

   int XSendExtensionEvent(Display *display, XDevice *device,
   Window window, Bool propagate, int event_count, XEventClass
   *event_list, XEvent *event);

   display

   Specifies the connection to the X server.

   device

   Specifies the device whose ID is recorded in the event.

   window

   Specifies the destination window ID. You can pass a window ID,
   PointerWindow or InputFocus .

   propagate

   Specifies a boolean value that is either True or False .

   event_count

   Specifies the number of elements in the event_list array.

   event_list

   Specifies a pointer to an array of XEventClass .

   event

   Specifies a pointer to the event that is to be sent.

   XSendExtensionEvent identifies the destination window,
   determines which clients should receive the specified event,
   and ignores any active grabs. It requires a list of XEventClass
   to be specified. These are obtained by opening an input device
   with the XOpenDevice request.

   XSendExtensionEvent uses the window argument to identify the
   destination window as follows:
     * If you pass PointerWindow , the destination window is the
       window that contains the pointer.
     * If you pass InputFocus and if the focus window contains the
       pointer, the destination window is the window that contains
       the pointer. If the focus window does not contain the
       pointer, the destination window is the focus window.

   To determine which clients should receive the specified events,
   XSendExtensionEvent uses the propagate argument as follows:
     * If propagate is False , the event is sent to every client
       selecting from the destination window any of the events
       specified in the event_list array.
     * If propagate is True and no clients have selected from the
       destination window any of the events specified in the
       event_list array, the destination is replaced with the
       closest ancestor of destination for which some client has
       selected one of the specified events and for which no
       intervening window has that event in its do_not_propagate
       mask. If no such window exists, or if the window is an
       ancestor of the focus window, and InputFocus was originally
       specified as the destination, the event is not sent to any
       clients. Otherwise, the event is reported to every client
       selecting on the final destination any of the events
       specified in event_list.

   The event in the XEvent structure must be one of the events
   defined by the input extension, so that the X server can
   correctly byte swap the contents as necessary. The contents of
   the event are otherwise unaltered and unchecked by the X server
   except to force send_event to True in the forwarded event and
   to set the sequence number in the event correctly.

   XSendExtensionEvent returns zero if the conversion-to-wire
   protocol failed; otherwise, it returns nonzero.

   XSendExtensionEvent can generate BadClass , BadDevice ,
   BadValue , and BadWindow errors.

Getting Motion History

   XDeviceTimeCoord * XGetDeviceMotionEvents( axis_count_return),
   Display *display, XDevice *device, Timestart, stop, int
   *nevents_return, int *mode_return, int *axis_count_return);

   display

   Specifies the connection to the X server.

   device

   Specifies the desired device.

   start

   Specifies the start time.

   stop

   Specifies the stop time.

   nevents_return

   Returns the number of positions in the motion buffer returned
   for this request.

   mode_return

   Returns the mode of the nevents information. The mode will be
   one of the following: Absolute or Relative .

   axis_count_return

   Returns the number of axes reported in each of the positions
   returned.

   XGetDeviceMotionEvents returns all positions in the device's
   motion history buffer that fall between the specified start and
   stop times inclusive. If the start time is in the future or is
   later than the stop time, no positions are returned.

   The return type for this function is an XDeviceTimeCoord
   structure, which is defined as follows:



typedef struct {
     Time time;
     unsigned int *data;
} XDeviceTimeCoord;

   The data member is a pointer to an array of data items. Each
   item is of type int, and there is one data item per axis of
   motion reported by the device. The number of axes reported by
   the device is returned in the axis_count variable.

   The value of the data items depends on the mode of the device.
   The mode is returned in the mode variable. If the mode is
   Absolute , the data items are the raw values generated by the
   device. These may be scaled by the client program using the
   maximum values that the device can generate for each axis of
   motion that it reports. The maximum value for each axis is
   reported in the max_val member of the XAxisInfo structure,
   which is part of the information returned by the
   XListInputDevices request.

   If the mode is Relative , the data items are the relative
   values generated by the device. The client program must choose
   an initial position for the device and maintain a current
   position by accumulating these relative values.

   Consecutive calls to XGetDeviceMotionEvents can return data of
   different modes, that is, if some client program has changed
   the mode of the device via an XSetDeviceMode request.

   XGetDeviceMotionEvents can generate BadDevice and BadMatch
   errors.

   To free the data returned by XGetDeviceMotionEvents , use
   XFreeDeviceMotionEvents .

   void XFreeDeviceMotionEvents(XDeviceTimeCoord *events);

   events

   Specifies the pointer to the XDeviceTimeCoord array returned by
   a previous call to XGetDeviceMotionEvents .

   XFreeDeviceMotionEvents frees the specified array of motion
   information. Appendix A

   The following information is contained in the
   <X11/extensions/XInput.h> and <X11/extensions/XI.h> header
   files:



/* Definitions used by the library and client */

#ifndef _XINPUT_H_
#define _XINPUT_H_

#ifndef _XLIB_H_
#include <X11/Xlib.h>
#endif

#ifndef _XI_H_
#include "XI.h"
#endif

#define _deviceKeyPress          0
#define _deviceKeyRelease     1

#define _deviceButtonPress     0
#define _deviceButtonRelease     1

#define _deviceMotionNotify     0

#define _deviceFocusIn          0
#define _deviceFocusOut          1

#define _proximityIn          0
#define _proximityOut          1

#define _deviceStateNotify     0
#define _deviceMappingNotify     1
#define _changeDeviceNotify     2

#define FindTypeAndClass(d, type, class, classid, offset) \
    { int i; XInputClassInfo *ip; \
    type = 0; class = 0; \
    for (i=0, ip= ((XDevice *) d)->classes; \
      i< ((XDevice *) d)->num_classes; \
      i++, ip++) \
     if (ip->input_class == classid) \
         {type =  ip->event_type_base + offset; \
          class =  ((XDevice *) d)->device_id << 8 | type;}}

#define DeviceKeyPress(d, type, class) \
    FindTypeAndClass(d, type, class, KeyClass, _deviceKeyPress)

#define DeviceKeyRelease(d, type, class) \
    FindTypeAndClass(d, type, class, KeyClass, _deviceKeyRelease)

#define DeviceButtonPress(d, type, class) \
    FindTypeAndClass(d, type, class, ButtonClass, _deviceButtonPress)

#define DeviceButtonRelease(d, type, class) \
    FindTypeAndClass(d, type, class, ButtonClass, _deviceButtonRelease)

#define DeviceMotionNotify(d, type, class) \
    FindTypeAndClass(d, type, class, ValuatorClass, _deviceMotionNotify)

#define DeviceFocusIn(d, type, class) \
    FindTypeAndClass(d, type, class, FocusClass, _deviceFocusIn)

#define DeviceFocusOut(d, type, class) \
    FindTypeAndClass(d, type, class, FocusClass, _deviceFocusOut)

#define ProximityIn(d, type, class) \
    FindTypeAndClass(d, type, class, ProximityClass, _proximityIn)

#define ProximityOut(d, type, class) \
    FindTypeAndClass(d, type, class, ProximityClass, _proximityOut)

#define DeviceStateNotify(d, type, class) \
    FindTypeAndClass(d, type, class, OtherClass, _deviceStateNotify)

#define DeviceMappingNotify(d, type, class) \
    FindTypeAndClass(d, type, class, OtherClass, _deviceMappingNotify)

#define ChangeDeviceNotify(d, type, class) \
    FindTypeAndClass(d, type, class, OtherClass, _changeDeviceNotify)

#define DevicePointerMotionHint(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _devicePointerMotionHin
t;}

#define DeviceButton1Motion(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _deviceButton1Motion;}

#define DeviceButton2Motion(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _deviceButton2Motion;}

#define DeviceButton3Motion(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _deviceButton3Motion;}

#define DeviceButton4Motion(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _deviceButton4Motion;}

#define DeviceButton5Motion(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _deviceButton5Motion;}

#define DeviceButtonMotion(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _deviceButtonMotion;}

#define DeviceOwnerGrabButton(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _deviceOwnerGrabButton;
}

#define DeviceButtonPressGrab(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _deviceButtonGrab;}

#define NoExtensionEvent(d, type, class) \
    { class =  ((XDevice *) d)->device_id << 8 | _noExtensionEvent;}

#define BadDevice(dpy, error) _xibaddevice(dpy, &error)

#define BadClass(dpy, error) _xibadclass(dpy, &error)

#define BadEvent(dpy, error) _xibadevent(dpy, &error)

#define BadMode(dpy, error) _xibadmode(dpy, &error)

#define DeviceBusy(dpy, error) _xidevicebusy(dpy, &error)

/***************************************************************
 *
 * DeviceKey events.  These events are sent by input devices that
 * support input class Keys.
 * The location of the X pointer is reported in the coordinate
 * fields of the x,y and x_root,y_root fields.
 *
 */

typedef struct
    {
    int            type;         /* of event */
    unsigned long  serial;       /* # of last request processed */
    Bool           send_event;   /* true if from SendEvent request */
    Display        *display;     /* Display the event was read from */
    Window         window;       /* "event" window reported relative to
*/
    XID            deviceid;
    Window         root;         /* root window event occurred on */
    Window         subwindow;    /* child window */
    Time           time;         /* milliseconds */
    int            x, y;         /* x, y coordinates in event window */
    int            x_root;       /* coordinates relative to root */
    int            y_root;       /* coordinates relative to root */
    unsigned int   state;        /* key or button mask */
    unsigned int   keycode;      /* detail */
    Bool           same_screen;  /* same screen flag */
    unsigned int   device_state; /* device key or button mask */
    unsigned char  axes_count;
    unsigned char  first_axis;
    int            axis_data[6];
    } XDeviceKeyEvent;

typedef XDeviceKeyEvent XDeviceKeyPressedEvent;
typedef XDeviceKeyEvent XDeviceKeyReleasedEvent;

/*******************************************************************
 *
 * DeviceButton events.  These events are sent by extension devices
 * that support input class Buttons.
 *
 */

typedef struct {
    int           type;         /* of event */
    unsigned long serial;       /* # of last request processed by server
 */
    Bool          send_event;   /* true if from a SendEvent request */
    Display       *display;     /* Display the event was read from */
    Window        window;       /* "event" window reported relative to *
/
    XID           deviceid;
    Window        root;         /* root window that the event occurred o
n */
    Window        subwindow;    /* child window */
    Time          time;         /* milliseconds */
    int           x, y;         /* x, y coordinates in event window */
    int           x_root;       /* coordinates relative to root */
    int           y_root;       /* coordinates relative to root */
    unsigned int  state;        /* key or button mask */
    unsigned int  button;       /* detail */
    Bool          same_screen;  /* same screen flag */
    unsigned int  device_state; /* device key or button mask */
    unsigned char axes_count;
    unsigned char first_axis;
    int           axis_data[6];
    } XDeviceButtonEvent;

typedef XDeviceButtonEvent XDeviceButtonPressedEvent;
typedef XDeviceButtonEvent XDeviceButtonReleasedEvent;

/*******************************************************************
 *
 * DeviceMotionNotify event.  These events are sent by extension devices
 * that support input class Valuators.
 *
 */

typedef struct
    {
    int           type;        /* of event */
    unsigned long serial;      /* # of last request processed by server
*/
    Bool          send_event;  /* true if from a SendEvent request */
    Display       *display;    /* Display the event was read from */
    Window        window;      /* "event" window reported relative to */
    XID           deviceid;
    Window        root;        /* root window that the event occurred on
 */
    Window        subwindow;   /* child window */
    Time          time;        /* milliseconds */
    int           x, y;        /* x, y coordinates in event window */
    int           x_root;      /* coordinates relative to root */
    int           y_root;      /* coordinates relative to root */
    unsigned int  state;       /* key or button mask */
    char          is_hint;     /* detail */
    Bool          same_screen; /* same screen flag */
    unsigned int  device_state; /* device key or button mask */
    unsigned char axes_count;
    unsigned char first_axis;
    int           axis_data[6];
    } XDeviceMotionEvent;

/*******************************************************************
 *
 * DeviceFocusChange events.  These events are sent when the focus
 * of an extension device that can be focused is changed.
 *
 */

typedef struct
    {
    int           type;       /* of event */
    unsigned long serial;     /* # of last request processed by server *
/
    Bool          send_event; /* true if from a SendEvent request */
    Display       *display;   /* Display the event was read from */
    Window        window;     /* "event" window reported relative to */
    XID           deviceid;
    int           mode;       /* NotifyNormal, NotifyGrab, NotifyUngrab
*/
    int           detail;
     /*
      * NotifyAncestor, NotifyVirtual, NotifyInferior,
      * NotifyNonLinear,NotifyNonLinearVirtual, NotifyPointer,
      * NotifyPointerRoot, NotifyDetailNone
      */
    Time                time;
    } XDeviceFocusChangeEvent;

typedef XDeviceFocusChangeEvent XDeviceFocusInEvent;
typedef XDeviceFocusChangeEvent XDeviceFocusOutEvent;

/*******************************************************************
 *
 * ProximityNotify events.  These events are sent by those absolute
 * positioning devices that are capable of generating proximity informat
ion.
 *
 */

typedef struct
    {
    int             type;      /* ProximityIn or ProximityOut */
    unsigned long   serial;    /* # of last request processed by server
*/
    Bool            send_event; /* true if this came from a SendEvent re
quest */
    Display         *display;  /* Display the event was read from */
    Window          window;
    XID                 deviceid;
    Window          root;
    Window          subwindow;
    Time            time;
    int             x, y;
    int             x_root, y_root;
    unsigned int    state;
    Bool            same_screen;
    unsigned int    device_state; /* device key or button mask */
    unsigned char   axes_count;
    unsigned char   first_axis;
    int             axis_data[6];
    } XProximityNotifyEvent;
typedef XProximityNotifyEvent XProximityInEvent;
typedef XProximityNotifyEvent XProximityOutEvent;

/*******************************************************************
 *
 * DeviceStateNotify events are generated on EnterWindow and FocusIn
 * for those clients who have selected DeviceState.
 *
 */

typedef struct
    {
    unsigned char     class;
    unsigned char     length;
    } XInputClass;

typedef struct {
    int           type;
    unsigned long serial;       /* # of last request processed by server
 */
    Bool          send_event;   /* true if this came from a SendEvent re
quest */
    Display       *display;     /* Display the event was read from */
    Window        window;
    XID           deviceid;
    Time          time;
    int           num_classes;
    char       data[64];
} XDeviceStateNotifyEvent;

typedef struct {
    unsigned char     class;
    unsigned char     length;
    unsigned char     num_valuators;
    unsigned char     mode;
    int                  valuators[6];
} XValuatorStatus;

typedef struct {
    unsigned char     class;
    unsigned char     length;
    short          num_keys;
    char             keys[32];
} XKeyStatus;

typedef struct {
    unsigned char     class;
    unsigned char     length;
    short          num_buttons;
    char             buttons[32];
} XButtonStatus;

/*******************************************************************
 *
 * DeviceMappingNotify event.  This event is sent when the key mapping,
 * modifier mapping, or button mapping of an extension device is changed
.
 *
 */

typedef struct {
    int           type;
    unsigned long serial;       /* # of last request processed by server
 */
    Bool          send_event;   /* true if this came from a SendEvent re
quest */
    Display       *display;     /* Display the event was read from */
    Window        window;       /* unused */
    XID           deviceid;
    Time          time;
    int           request;      /* one of MappingModifier, MappingKeyboa
rd,
                                    MappingPointer */
    int           first_keycode;/* first keycode */
    int           count;        /* defines range of change w. first_keyc
ode*/
} XDeviceMappingEvent;

/*******************************************************************
 *
 * ChangeDeviceNotify event.  This event is sent when an
 * XChangeKeyboard or XChangePointer request is made.
 *
 */

typedef struct {
    int           type;
    unsigned long serial;       /* # of last request processed by server
 */
    Bool          send_event;   /* true if this came from a SendEvent re
quest */
    Display       *display;     /* Display the event was read from */
    Window        window;       /* unused */
    XID           deviceid;
    Time          time;
    int           request;      /* NewPointer or NewKeyboard */
} XChangeDeviceNotifyEvent;

/*******************************************************************
 *
 * Control structures for input devices that support input class
 * Feedback.  These are used by the XGetFeedbackControl and
 * XChangeFeedbackControl functions.
 *
 */

typedef struct {
     XID            class;
     int            length;
     XID            id;
} XFeedbackState;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     click;
    int     percent;
    int     pitch;
    int     duration;
    int     led_mask;
    int     global_auto_repeat;
    char    auto_repeats[32];
} XKbdFeedbackState;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     accelNum;
    int     accelDenom;
    int     threshold;
} XPtrFeedbackState;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     resolution;
    int     minVal;
    int     maxVal;
} XIntegerFeedbackState;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     max_symbols;
    int     num_syms_supported;
    KeySym  *syms_supported;
} XStringFeedbackState;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     percent;
    int     pitch;
    int     duration;
} XBellFeedbackState;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     led_values;
    int     led_mask;
} XLedFeedbackState;

typedef struct {
     XID            class;
     int            length;
     XID         id;
} XFeedbackControl;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     accelNum;
    int     accelDenom;
    int     threshold;
} XPtrFeedbackControl;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     click;
    int     percent;
    int     pitch;
    int     duration;
    int     led_mask;
    int     led_value;
    int     key;
    int     auto_repeat_mode;
} XKbdFeedbackControl;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     num_keysyms;
    KeySym  *syms_to_display;
} XStringFeedbackControl;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     int_to_display;
} XIntegerFeedbackControl;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     percent;
    int     pitch;
    int     duration;
} XBellFeedbackControl;

typedef struct {
    XID     class;
    int     length;
    XID     id;
    int     led_mask;
    int     led_values;
} XLedFeedbackControl;

/*******************************************************************
 *
 * Device control structures.
 *
 */

typedef struct {
     XID            control;
     int            length;
} XDeviceControl;

typedef struct {
     XID            control;
     int            length;
     int            first_valuator;
     int            num_valuators;
     int            *resolutions;
} XDeviceResolutionControl;

typedef struct {
     XID            control;
     int            length;
     int            num_valuators;
     int            *resolutions;
     int            *min_resolutions;
     int            *max_resolutions;
} XDeviceResolutionState;

/*******************************************************************
 *
 * An array of XDeviceList structures is returned by the
 * XListInputDevices function.  Each entry contains information
 * about one input device.  Among that information is an array of
 * pointers to structures that describe the characteristics of
 * the input device.
 *
 */

typedef struct _XAnyClassinfo *XAnyClassPtr;

typedef struct _XAnyClassinfo {
    XID      class;
    int      length;
    } XAnyClassInfo;

typedef struct _XDeviceInfo *XDeviceInfoPtr;

typedef struct _XDeviceInfo
    {
    XID                 id;
    Atom                type;
    char                *name;
    int                 num_classes;
    int                 use;
    XAnyClassPtr      inputclassinfo;
    } XDeviceInfo;

typedef struct _XKeyInfo *XKeyInfoPtr;

typedef struct _XKeyInfo
    {
    XID               class;
    int               length;
    unsigned short      min_keycode;
    unsigned short      max_keycode;
    unsigned short      num_keys;
    } XKeyInfo;

typedef struct _XButtonInfo *XButtonInfoPtr;

typedef struct _XButtonInfo {
    XID          class;
    int          length;
    short      num_buttons;
    } XButtonInfo;

typedef struct _XAxisInfo *XAxisInfoPtr;

typedef struct _XAxisInfo {
    int      resolution;
    int      min_value;
    int      max_value;
    } XAxisInfo;

typedef struct _XValuatorInfo *XValuatorInfoPtr;

typedef struct     _XValuatorInfo
    {
    XID               class;
    int               length;
    unsigned char       num_axes;
    unsigned char       mode;
    unsigned long       motion_buffer;
    XAxisInfoPtr        axes;
    } XValuatorInfo;


/*******************************************************************
 *
 * An XDevice structure is returned by the XOpenDevice function.
 * It contains an array of pointers to XInputClassInfo structures.
 * Each contains information about a class of input supported by the
 * device, including a pointer to an array of data for each type of even
t
 * the device reports.
 *
 */


typedef struct {
        unsigned char   input_class;
        unsigned char   event_type_base;
} XInputClassInfo;

typedef struct {
        XID                    device_id;
        int                    num_classes;
        XInputClassInfo        *classes;
} XDevice;


/*******************************************************************
 *
 * The following structure is used to return information for the
 * XGetSelectedExtensionEvents function.
 *
 */

typedef struct {
        XEventClass     event_type;
        XID             device;
} XEventList;

/*******************************************************************
 *
 * The following structure is used to return motion history data from
 * an input device that supports the input class Valuators.
 * This information is returned by the XGetDeviceMotionEvents function.
 *
 */

typedef struct {
        Time   time;
        int    *data;
} XDeviceTimeCoord;


/*******************************************************************
 *
 * Device state structure.
 * This is returned by the XQueryDeviceState request.
 *
 */

typedef struct {
        XID          device_id;
        int          num_classes;
        XInputClass     *data;
} XDeviceState;

/*******************************************************************
 *
 * Note that the mode field is a bitfield that reports the Proximity
 * status of the device as well as the mode.  The mode field should
 * be OR'd with the mask DeviceMode and compared with the values
 * Absolute and Relative to determine the mode, and should be OR'd
 * with the mask ProximityState and compared with the values InProximity
 * and OutOfProximity to determine the proximity state.
 *
 */

typedef struct {
    unsigned char     class;
    unsigned char     length;
    unsigned char     num_valuators;
    unsigned char     mode;
    int                  *valuators;
} XValuatorState;

typedef struct {
    unsigned char     class;
    unsigned char     length;
    short          num_keys;
    char             keys[32];
} XKeyState;

typedef struct {
    unsigned char     class;
    unsigned char     length;
    short          num_buttons;
    char             buttons[32];
} XButtonState;

/*******************************************************************
 *
 * Function definitions.
 *
 */

_XFUNCPROTOBEGIN

extern int     XChangeKeyboardDevice(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */
#endif
);

extern int     XChangePointerDevice(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    int               /* xaxis */,
    int               /* yaxis */
#endif
);

extern int     XGrabDevice(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    Window          /* grab_window */,
    Bool          /* ownerEvents */,
    int               /* event count */,
    XEventClass*     /* event_list */,
    int               /* this_device_mode */,
    int               /* other_devices_mode */,
    Time          /* time */
#endif
);

extern int     XUngrabDevice(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    Time           /* time */
#endif
);

extern int     XGrabDeviceKey(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    unsigned int     /* key */,
    unsigned int     /* modifiers */,
    XDevice*          /* modifier_device */,
    Window          /* grab_window */,
    Bool          /* owner_events */,
    unsigned int     /* event_count */,
    XEventClass*     /* event_list */,
    int               /* this_device_mode */,
    int               /* other_devices_mode */
#endif
);

extern int     XUngrabDeviceKey(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    unsigned int     /* key */,
    unsigned int     /* modifiers */,
    XDevice*          /* modifier_dev */,
    Window          /* grab_window */
#endif
);

extern int     XGrabDeviceButton(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    unsigned int     /* button */,
    unsigned int     /* modifiers */,
    XDevice*          /* modifier_device */,
    Window          /* grab_window */,
    Bool          /* owner_events */,
    unsigned int     /* event_count */,
    XEventClass*     /* event_list */,
    int               /* this_device_mode */,
    int               /* other_devices_mode */
#endif
);

extern int     XUngrabDeviceButton(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    unsigned int     /* button */,
    unsigned int     /* modifiers */,
    XDevice*          /* modifier_dev */,
    Window          /* grab_window */
#endif
);

extern int     XAllowDeviceEvents(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    int               /* event_mode */,
    Time          /* time */
#endif
);

extern int     XGetDeviceFocus(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    Window*          /* focus */,
    int*          /* revert_to */,
    Time*          /* time */
#endif
);

extern int     XSetDeviceFocus(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    Window          /* focus */,
    int               /* revert_to */,
    Time          /* time */
#endif
);

extern XFeedbackState     *XGetFeedbackControl(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    int*          /* num_feedbacks */
#endif
);

extern int     XFreeFeedbackList(
#if NeedFunctionPrototypes
    XFeedbackState*     /* list */
#endif
);

extern int     XChangeFeedbackControl(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    unsigned long     /* mask */,
    XFeedbackControl*     /* f */
#endif
);

extern int     XDeviceBell(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    XID               /* feedbackclass */,
    XID               /* feedbackid */,
    int               /* percent */
#endif
);

extern KeySym     *XGetDeviceKeyMapping(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
#if NeedWidePrototypes
    unsigned int     /* first */,
#else
    KeyCode          /* first */,
#endif
    int               /* keycount */,
    int*          /* syms_per_code */
#endif
);

extern int     XChangeDeviceKeyMapping(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    int               /* first */,
    int               /* syms_per_code */,
    KeySym*          /* keysyms */,
    int               /* count */
#endif
);

extern XModifierKeymap     *XGetDeviceModifierMapping(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */
#endif
);

extern int     XSetDeviceModifierMapping(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    XModifierKeymap*     /* modmap */
#endif
);

extern int     XSetDeviceButtonMapping(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    unsigned char*     /* map[] */,
    int               /* nmap */
#endif
);

extern int     XGetDeviceButtonMapping(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    unsigned char*     /* map[] */,
    unsigned int     /* nmap */
#endif
);

extern XDeviceState     *XQueryDeviceState(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */
#endif
);

extern int     XFreeDeviceState(
#if NeedFunctionPrototypes
    XDeviceState*     /* list */
#endif
);

extern XExtensionVersion *XGetExtensionVersion(
#if NeedFunctionPrototypes
    Display*          /* display */,
    _Xconst char*     /* name */
#endif
);

extern XDeviceInfo     *XListInputDevices(
#if NeedFunctionPrototypes
    Display*          /* display */,
    int*          /* ndevices */
#endif
);

extern int     XFreeDeviceList(
#if NeedFunctionPrototypes
    XDeviceInfo*     /* list */
#endif
);

extern XDevice     *XOpenDevice(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XID               /* id */
#endif
);

extern int     XCloseDevice(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */
#endif
);

extern int     XSetDeviceMode(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    int               /* mode */
#endif
);

extern int     XSetDeviceValuators(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    int*          /* valuators */,
    int               /* first_valuator */,
    int               /* num_valuators */
#endif
);

extern XDeviceControl     *XGetDeviceControl(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    int               /* control */
#endif
);

extern int     XChangeDeviceControl(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    int               /* control */,
    XDeviceControl*     /* d */
#endif
);

extern int     XSelectExtensionEvent(
#if NeedFunctionPrototypes
    Display*          /* display */,
    Window          /* w */,
    XEventClass*     /* event_list */,
    int               /* count */
#endif
);

extern int     XGetSelectedExtensionEvents(
#if NeedFunctionPrototypes
    Display*          /* display */,
    Window          /* w */,
    int*          /* this_client_count */,
    XEventClass**     /* this_client_list */,
    int*          /* all_clients_count */,
    XEventClass**     /* all_clients_list */
#endif
);

extern int     XChangeDeviceDontPropagateList(
#if NeedFunctionPrototypes
    Display*          /* display */,
    Window          /* window */,
    int               /* count */,
    XEventClass*     /* events */,
    int               /* mode */
#endif
);

extern XEventClass     *XGetDeviceDontPropagateList(
#if NeedFunctionPrototypes
    Display*          /* display */,
    Window          /* window */,
    int*          /* count */
#endif
);

extern Status     XSendExtensionEvent(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    Window          /* dest */,
    Bool          /* prop */,
    int               /* count */,
    XEventClass*     /* list */,
    XEvent*          /* event */
#endif
);

extern XDeviceTimeCoord     *XGetDeviceMotionEvents(
#if NeedFunctionPrototypes
    Display*          /* display */,
    XDevice*          /* device */,
    Time          /* start */,
    Time          /* stop */,
    int*          /* nEvents */,
    int*          /* mode */,
    int*          /* axis_count */
#endif
);

extern int     XFreeDeviceMotionEvents(
#if NeedFunctionPrototypes
    XDeviceTimeCoord*     /* events */
#endif
);

extern int     XFreeDeviceControl(
#if NeedFunctionPrototypes
    XDeviceControl*     /* control */
#endif
);

_XFUNCPROTOEND

#endif /* _XINPUT_H_ */

/* Definitions used by the server, library and client */

#ifndef _XI_H_

#define _XI_H_

#define sz_xGetExtensionVersionReq          8
#define sz_xGetExtensionVersionReply          32
#define sz_xListInputDevicesReq               4
#define sz_xListInputDevicesReply          32
#define sz_xOpenDeviceReq               8
#define sz_xOpenDeviceReply               32
#define sz_xCloseDeviceReq               8
#define sz_xSetDeviceModeReq               8
#define sz_xSetDeviceModeReply               32
#define sz_xSelectExtensionEventReq          12
#define sz_xGetSelectedExtensionEventsReq     8
#define sz_xGetSelectedExtensionEventsReply     32
#define sz_xChangeDeviceDontPropagateListReq     12
#define sz_xGetDeviceDontPropagateListReq     8
#define sz_xGetDeviceDontPropagateListReply     32
#define sz_xGetDeviceMotionEventsReq          16
#define sz_xGetDeviceMotionEventsReply          32
#define sz_xChangeKeyboardDeviceReq          8
#define sz_xChangeKeyboardDeviceReply          32
#define sz_xChangePointerDeviceReq          8
#define sz_xChangePointerDeviceReply          32
#define sz_xGrabDeviceReq               20
#define sz_xGrabDeviceReply               32
#define sz_xUngrabDeviceReq               12
#define sz_xGrabDeviceKeyReq               20
#define sz_xGrabDeviceKeyReply               32
#define sz_xUngrabDeviceKeyReq               16
#define sz_xGrabDeviceButtonReq               20
#define sz_xGrabDeviceButtonReply          32
#define sz_xUngrabDeviceButtonReq          16
#define sz_xAllowDeviceEventsReq          12
#define sz_xGetDeviceFocusReq               8
#define sz_xGetDeviceFocusReply               32
#define sz_xSetDeviceFocusReq               16
#define sz_xGetFeedbackControlReq          8
#define sz_xGetFeedbackControlReply          32
#define sz_xChangeFeedbackControlReq          12
#define sz_xGetDeviceKeyMappingReq          8
#define sz_xGetDeviceKeyMappingReply          32
#define sz_xChangeDeviceKeyMappingReq          8
#define sz_xGetDeviceModifierMappingReq          8
#define sz_xSetDeviceModifierMappingReq          8
#define sz_xSetDeviceModifierMappingReply     32
#define sz_xGetDeviceButtonMappingReq          8
#define sz_xGetDeviceButtonMappingReply          32
#define sz_xSetDeviceButtonMappingReq          8
#define sz_xSetDeviceButtonMappingReply          32
#define sz_xQueryDeviceStateReq               8
#define sz_xQueryDeviceStateReply          32
#define sz_xSendExtensionEventReq          16
#define sz_xDeviceBellReq               8
#define sz_xSetDeviceValuatorsReq          8
#define sz_xSetDeviceValuatorsReply          32
#define sz_xGetDeviceControlReq               8
#define sz_xGetDeviceControlReply          32
#define sz_xChangeDeviceControlReq          8
#define sz_xChangeDeviceControlReply          32

#define INAME                "XInputExtension"

#define XI_KEYBOARD     "KEYBOARD"
#define XI_MOUSE     "MOUSE"
#define XI_TABLET     "TABLET"
#define XI_TOUCHSCREEN     "TOUCHSCREEN"
#define XI_TOUCHPAD     "TOUCHPAD"
#define XI_BARCODE     "BARCODE"
#define XI_BUTTONBOX     "BUTTONBOX"
#define XI_KNOB_BOX     "KNOB_BOX"
#define XI_ONE_KNOB     "ONE_KNOB"
#define XI_NINE_KNOB     "NINE_KNOB"
#define XI_TRACKBALL     "TRACKBALL"
#define XI_QUADRATURE     "QUADRATURE"
#define XI_ID_MODULE     "ID_MODULE"
#define XI_SPACEBALL     "SPACEBALL"
#define XI_DATAGLOVE     "DATAGLOVE"
#define XI_EYETRACKER     "EYETRACKER"
#define XI_CURSORKEYS     "CURSORKEYS"
#define XI_FOOTMOUSE     "FOOTMOUSE"

#define Dont_Check               0
#define XInput_Initial_Release          1
#define XInput_Add_XDeviceBell          2
#define XInput_Add_XSetDeviceValuators     3
#define XInput_Add_XChangeDeviceControl     4

#define XI_Absent          0
#define XI_Present          1

#define XI_Initial_Release_Major          1
#define XI_Initial_Release_Minor          0

#define XI_Add_XDeviceBell_Major          1
#define XI_Add_XDeviceBell_Minor          1

#define XI_Add_XSetDeviceValuators_Major     1
#define XI_Add_XSetDeviceValuators_Minor     2

#define XI_Add_XChangeDeviceControl_Major     1
#define XI_Add_XChangeDeviceControl_Minor     3

#define DEVICE_RESOLUTION     1

#define NoSuchExtension          1

#define COUNT               0
#define CREATE               1

#define NewPointer          0
#define NewKeyboard          1

#define XPOINTER          0
#define XKEYBOARD          1

#define UseXKeyboard          0xFF

#define IsXPointer          0
#define IsXKeyboard          1
#define IsXExtensionDevice     2

#define AsyncThisDevice          0
#define SyncThisDevice          1
#define ReplayThisDevice     2
#define AsyncOtherDevices     3
#define AsyncAll          4
#define SyncAll               5

#define FollowKeyboard           3
#define RevertToFollowKeyboard      3

#define DvAccelNum              (1L << 0)
#define DvAccelDenom            (1L << 1)
#define DvThreshold             (1L << 2)

#define DvKeyClickPercent     (1L<<0)
#define DvPercent          (1L<<1)
#define DvPitch               (1L<<2)
#define DvDuration          (1L<<3)
#define DvLed               (1L<<4)
#define DvLedMode          (1L<<5)
#define DvKey               (1L<<6)
#define DvAutoRepeatMode     (1L<<7)

#define DvString                (1L << 0)

#define DvInteger               (1L << 0)

#define DeviceMode              (1L << 0)
#define Relative                0
#define Absolute                1

#define ProximityState          (1L << 1)
#define InProximity             (0L << 1)
#define OutOfProximity          (1L << 1)

#define AddToList               0
#define DeleteFromList          1

#define KeyClass            0
#define ButtonClass            1
#define ValuatorClass            2
#define FeedbackClass            3
#define ProximityClass       4
#define FocusClass            5
#define OtherClass            6

#define KbdFeedbackClass       0
#define PtrFeedbackClass       1
#define StringFeedbackClass       2
#define IntegerFeedbackClass       3
#define LedFeedbackClass       4
#define BellFeedbackClass       5

#define _devicePointerMotionHint 0
#define _deviceButton1Motion      1
#define _deviceButton2Motion      2
#define _deviceButton3Motion      3
#define _deviceButton4Motion      4
#define _deviceButton5Motion      5
#define _deviceButtonMotion      6
#define _deviceButtonGrab      7
#define _deviceOwnerGrabButton      8
#define _noExtensionEvent      9

#define XI_BadDevice     0
#define XI_BadEvent     1
#define XI_BadMode     2
#define XI_DeviceBusy     3
#define XI_BadClass     4

typedef     unsigned long     XEventClass;

/*******************************************************************
 *
 * Extension version structure.
 *
 */

typedef struct {
        int        present;
        short     major_version;
        short     minor_version;
} XExtensionVersion;

#endif /* _XI_H_ */


Appendix A. Input Extension Protocol Encoding

   Syntactic Conventions

   All numbers are in decimal, unless prefixed with #x, in which
   case they are in hexadecimal (base 16).

   The general syntax used to describe requests, replies, errors,
   events, and compound types is:

NameofThing
  encode-form
  ...
  encode-form

   Each encode-form describes a single component.

   For components described in the protocol as:

name: TYPE

   the encode-form is:



N       TYPE    name

   N is the number of bytes occupied in the data stream, and TYPE
   is the interpretation of those bytes. For example,



depth: CARD8

   becomes:



1       CARD8   depth

   For components with a static numeric value the encode-form is:



N       value   name

   The value is always interpreted as an N-byte unsigned integer.
   For example, the first two bytes of a Window error are always
   zero (indicating an error in general) and three (indicating the
   Window error in particular):



1       0       Error
1       3       code

   For components described in the protocol as:

name: {Name1, ..., NameI}

   the encode-form is:



N               name
        value1 Name1
        ...
        valueI NameI

   The value is always interpreted as an N-byte unsigned integer.
   Note that the size of N is sometimes larger than that strictly
   required to encode the values. For example:

class: {InputOutput, InputOnly, CopyFromParent}

   becomes:



2                       class
        0       CopyFromParent
        1       InputOutput
        2       InputOnly

   For components described in the protocol as:

NAME: TYPE or Alternative1 ... or AlternativeI

   the encode-form is:



N       TYPE                    NAME
        value1  Alternative1
        ...
        valueI  AlternativeI

   The alternative values are guaranteed not to conflict with the
   encoding of TYPE. For example:

destination: WINDOW or PointerWindow or InputFocus

   becomes:



4       WINDOW          destination
        0       PointerWindow
        1       InputFocus

   For components described in the protocol as:



value-mask: BITMASK

   the encode-form is:



N       BITMASK                 value-mask
        mask1   mask-name1
        ...
        maskI   mask-nameI

   The individual bits in the mask are specified and named, and N
   is 2 or 4. The most-significant bit in a BITMASK is reserved
   for use in defining chained (multiword) bitmasks, as extensions
   augment existing core requests. The precise interpretation of
   this bit is not yet defined here, although a probable mechanism
   is that a 1-bit indicates that another N bytes of bitmask
   follows, with bits within the overall mask still interpreted
   from least-significant to most-significant with an N-byte unit,
   with N-byte units interpreted in stream order, and with the
   overall mask being byte-swapped in individual N-byte units.

   For LISTofVALUE encodings, the request is followed by a section
   of the form:



VALUEs
 encode-form
 ...
 encode-form

   listing an encode-form for each VALUE. The NAME in each
   encode-form keys to the corresponding BITMASK bit. The encoding
   of a VALUE always occupies four bytes, but the number of bytes
   specified in the encoding-form indicates how many of the
   least-significant bytes are actually used; the remaining bytes
   are unused and their values do not matter.

   In various cases, the number of bytes occupied by a component
   will be specified by a lowercase single-letter variable name
   instead of a specific numeric value, and often some other
   component will have its value specified as a simple numeric
   expression involving these variables. Components specified with
   such expressions are always interpreted as unsigned integers.
   The scope of such variables is always just the enclosing
   request, reply, error, event, or compound type structure. For
   example:



2       3+n                     request length
4n      LISTofPOINT             points

   For unused bytes (the values of the bytes are undefined and do
   not matter), the encode-form is:



N                       unused

   If the number of unused bytes is variable, the encode-form
   typically is:



p                       unused, p=pad(E)

   where E is some expression, and pad(E) is the number of bytes
   needed to round E up to a multiple of four.



pad(E) = (4 - (E mod 4)) mod 4

   Common Types

   LISTofFOO
     * In this document the LISTof notation strictly means some
       number of repetitions of the FOO encoding; the actual
       length of the list is encoded elsewhere.

   SETofFOO
     * A set is always represented by a bitmask, with a 1-bit
       indicating presence in the set.

   BITMASK: CARD32

   WINDOW: CARD32

   BYTE: 8-bit value

   INT8: 8-bit signed integer

   INT16: 16-bit signed integer

   INT32: 32-bit signed integer

   CARD8: 8-bit unsigned integer

   CARD16: 16-bit unsigned integer

   CARD32: 32-bit unsigned integer

   TIMESTAMP: CARD32

   EVENTCLASS: CARD32



INPUTCLASS
        0       KeyClass
        1       ButtonClass
        2       ValuatorClass
        3       FeedbackClass
        4       ProximityClass
        5       FocusClass
        6       OtherClass



INPUTCLASS
        0       KbdFeedbackClass
        1       PtrFeedbackClass
        2       StringFeedbackClass
        3       IntegerFeedbackClass
        4       LedFeedbackClass
        5       BellFeedbackClass



INPUTINFO
        0       KEYINFO
        1       BUTTONINFO
        2       VALUATORINFO



DEVICEMODE
        0       Relative
        1       Absolute



PROXIMITYSTATE
        0       InProximity
        1       OutOfProximity



BOOL
        0       False
        1       True

   KEYSYM: CARD32

   KEYCODE: CARD8

   BUTTON: CARD8



SETofKEYBUTMASK
        #x0001  Shift
        #x0002  Lock
        #x0004  Control
        #x0008  Mod1
        #x0010  Mod2
        #x0020  Mod3
        #x0040  Mod4
        #x0080  Mod5
        #x0100  Button1
        #x0200  Button2
        #x0400  Button3
        #x0800  Button4
        #x1000  Button5
        #xe000  unused but must be zero



SETofKEYMASK
        encodings are the same as for SETofKEYBUTMASK, except with
        #xff00          unused but must be zero

   STRING8: LISTofCARD8



STR
        1       n               length of name in bytes
        n       STRING8         name

   Errors



Request
        1       0               Error
        1       1               code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Value
        1       0               Error
        1       2               code
        2       CARD16          sequence number
        4       <32-bits>               bad value
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Window
        1       0               Error
        1       3               code
        2       CARD16          sequence number
        4       CARD32          bad resource id
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Match
        1       0               Error
        1       8               code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Access
        1       0               Error
        1       10              code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Alloc
        1       0               Error
        1       11              code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Name
        1       0               Error
        1       15              code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Device
        1       0               Error
        1       CARD8           code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Event
        1       0               Error
        1       CARD8           code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Mode
        1       0               Error
        1       CARD8           code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused



Class
        1       0               Error
        1       CARD8           code
        2       CARD16          sequence number
        4                       unused
        2       CARD16          minor opcode
        1       CARD8           major opcode
        21                      unused

   Keyboards

   KEYCODE values are always greater than 7 (and less than 256).

   KEYSYM values with the bit #x10000000 set are reserved as
   vendor-specific.

   The names and encodings of the standard KEYSYM values are
   contained in appendix F.

   Pointers

   BUTTON values are numbered starting with one.

   Requests



GetExtensionVersion
        1       CARD8           input extension opcode
        1       1               GetExtensionVersion opcode
        2       2+(n+p)/4               request length
        2       n               length of name
        2                       unused
        n       STRING8         name
        p                       unused, p=pad(n)



 =>
        1       1               Reply
        1       1               GetExtensionVersion opcode
        2       CARD16          sequence number
        4       0               reply length
        2       CARD16          major version
        2       CARD16          minor version
        1       BOOL            present
        19                      unused



ListInputDevices
        1       CARD8           input extension opcode
        1       2               ListInputDevices opcode
        2       1               request length



 =>
        1       1                       Reply
        1       2                       ListInputDevices opcode
        2       CARD16                  sequence number
        4       (n+p)/4                 reply length
        1       CARD8                   number of input devices
        23                              unused
        n       LISTofDEVICEINFO        info for each input device
        p                               unused, p=pad(n)



  DEVICEINFO
        4       CARD32          device type
        1       CARD8           device id
        1       CARD8           number of input classes this device repo
rts
        1       CARD8           device use
                        0       IsXPointer
                        1       IsXKeyboard
                        2       IsXExtensionDevice
        1                       unused
        n       LISTofINPUTINFO                 input info for each inpu
t class
        m       STR                     name
        p                               unused, p=pad(m)



  INPUTINFO     KEYINFO or BUTTONINFO or VALUATORINFO



  KEYINFO
        1       0               class id
        1       8               length
        1       KEYCODE         minimum keycode
        1       KEYCODE         maximum keycode
        2       CARD16          number of keys
        2                       unused



BUTTONINFO
        1       1               class id
        1       4               length
        2       CARD16          number of buttons



VALUATORINFO
        1       2               class id
        1       8+12n           length
        1       n               number of axes
        1       SETofDEVICEMODE                 mode
        4       CARD32          size of motion buffer
        12n     LISTofAXISINFO          valuator limits



AXISINFO
        4       CARD32          resolution
        4       CARD32          minimum value
        4       CARD32          maximum value



OpenDevice
        1       CARD8           input extension opcode
        1       3               OpenDevice opcode
        2       2               request length
        1       CARD8           device id
        3                       unused



 =>
        1       1                       Reply
        1       3                       OpenDevice opcode
        2       CARD16                  sequence number
        4       (n+p)/4                 reply length
        1       CARD8                   number of input classes
        23                              unused
        n       LISTofINPUTCLASSINFO    input class information
        p                               unused, p=pad(n)



  INPUTCLASSINFO
        1       CARD8           input class id
                0       KEY
                1       BUTTON
                2       VALUATOR
                3       FEEDBACK
                4       PROXIMITY
                5       FOCUS
                6       OTHER
        1       CARD8           event type base code for this class



CloseDevice
        1       CARD8           input extension opcode
        1       4               CloseDevice opcode
        2       2               request length
        1       CARD8           device id
        3                       unused



SetDeviceMode
        1       CARD8           input extension opcode
        1       5               SetDeviceMode opcode
        2       2               request length
        1       CARD8           device id
        1       CARD8           mode
        2                       unused



 =>
        1       1                       Reply
        1       5                       SetDeviceMode opcode
        2       CARD16                  sequence number
        4       0                       reply length
        1       CARD8                   status
                0               Success
                        1       AlreadyGrabbed
                3 + first_error DeviceBusy
        23                              unused



SelectExtensionEvent
        1       CARD8                   input extension opcode
        1       6                       SelectExtensionEvent opcode
        2       3+n                             request length
        4       Window                  event window
        2       CARD16                  count
        2                               unused
        4n      LISTofEVENTCLASS        desired events



GetSelectedExtensionEvents
        1       CARD8           input extension opcode
        1       7               GetSelectedExtensionEvents opcode
        2       2               request length
        4       Window          event window



 =>
        1       1               Reply
        1       7               GetSelecteExtensionEvents opcode
        2       CARD16          sequence number
        4       n + m           reply length
        2       n               this client count
        2       m               all clients count
        20                      unused
        4n      LISTofEVENTCLASS        this client list
        4m      LISTofEVENTCLASS        all clients list



ChangeDeviceDontPropagateList
        1       CARD8                   input extension opcode
        1       8                       ChangeDeviceDontPropagateList op
code
        2       3+n                             request length
        4       Window                  event window
        2       n                       count of events
        1       mode
                0       AddToList
                1       DeleteFromList
        1                               unused
        4n      LISTofEVENTCLASS        desired events



GetDeviceDontPropagateList
        1       CARD8           input extension opcode
        1       9               GetDeviceDontPropagateList opcode
        2       2               request length
        4       Window          event window



 =>
        1       1                       Reply
        1       9                       GetDeviceDontPropagateList opcod
e
        2       CARD16                  sequence number
        4       n                       reply length
        2       n                       count of events
        22                              unused
        4n      LISTofEVENTCLASS        don't propagate list



GetDeviceMotionEvents
        1       CARD8           input extension opcode
        1       10              GetDeviceMotionEvents opcode
        2       4               request length
        4       TIMESTAMP               start
                0       CurrentTime
        4       TIMESTAMP               stop
                0       CurrentTime
        1       CARD8           device id
        3                       unused



 =>
        1               1               Reply
        1               10      GetDeviceMotionEvents opcode
        2               CARD16  sequence number
        4               (m+1)n  reply length
        4               n               number of DEVICETIMECOORDs in ev
ents
        1               m               number of valuators per event
        1               CARD8           mode of the device
                        0       Absolute
                        1       Relative
        18                              unused
        (4m+4)n LISTofDEVICETIMECOORD   events



  DEVICETIMECOORD
        4       TIMESTAMP               time
        4m      LISTofINT32             valuators



ChangeKeyboardDevice
        1       CARD8           input extension opcode
        1       11              ChangeKeyboardDevice opcode
        2       2               request length
        1       CARD8           device id
        3                       unused



 =>
        1       1               Reply
        1       11              ChangeKeyboardDevice opcode
        2       CARD16          sequence number
        4       0               reply length
        1                       status
                0       Success
                1       AlreadyGrabbed
                2       DeviceFrozen
        23                      unused



ChangePointerDevice
        1       CARD8           input extension opcode
        1       12              ChangePointerDevice opcode
        2       2               request length
        1       CARD8           x-axis
        1       CARD8           y-axis
        1       CARD8           device id
        1                       unused



 =>
        1       1               Reply
        1       12              ChangePointerDevice opcode
        2       CARD16          sequence number
        4       0               reply length
        1                       status
                0       Success
                1       AlreadyGrabbed
                2       DeviceFrozen
        23                      unused



GrabDevice
        1       CARD8           input extension opcode
        1       13              GrabDevice opcode
        2       5+n                     request length
        4       WINDOW          grab-window
        4       TIMESTAMP               time
                0       CurrentTime
        2       n               count of events
        1                       this-device-mode
                0       Synchronous
                1       Asynchronous
        1                       other-devices-mode
                0       Synchronous
                1       Asynchronous
        1       BOOL            owner-events
        1       CARD8           device id
        2                       unused
        4n      LISTofEVENTCLASS        event list



 =>
        1       1               Reply
        1       13              GrabDevice opcode
        2       CARD16          sequence number
        4       0               reply length
        1                       status
                0       Success
                1       AlreadyGrabbed
                2       InvalidTime
                3       NotViewable
                4       Frozen
        23                      unused



UngrabDevice
        1       CARD8           input extension opcode
        1       14              UngrabDevice opcode
        2       3               request length
        4       TIMESTAMP               time
                0       CurrentTime
        1       CARD8           device id
        3                       unused



GrabDeviceKey
        1       CARD8           input extension opcode
        1       15              GrabDeviceKey opcode
        2       5+n             request length
        4       WINDOW          grab-window
        2       n               count of events
        2       SETofKEYMASK            modifiers
                #x8000  AnyModifier
        1       CARD8           modifier device
                #x0FF   UseXKeyboard
        1       CARD8           grabbed device
        1       KEYCODE                 key
                0       AnyKey
        1                       this-device-mode
                0       Synchronous
                1       Asynchronous
        1                       other-devices-mode
                0       Synchronous
                1       Asynchronous
        1       BOOL            owner-events
        2                       unused
        4n      LISTofEVENTCLASS        event list



UngrabDeviceKey
        1       CARD8           input extension opcode
        1       16              UngrabDeviceKey opcode
        2       4               request length
        4       WINDOW          grab-window
        2       SETofKEYMASK            modifiers
                #x8000  AnyModifier
        1       CARD8           modifier device
                #x0FF   UseXKeyboard
        1       KEYCODE                 key
                0       AnyKey
        1       CARD8           grabbed device
        3                       unused




GrabDeviceButton
        1       CARD8           input extension opcode
        1       17              GrabDeviceButton opcode
        2       5+n             request length
        4       WINDOW          grab-window
        1       CARD8           grabbed device
        1       CARD8           modifier device
                #x0FF   UseXKeyboard
        2       n               count of desired events
        2       SETofKEYMASK            modifiers
        1                       this-device-mode
                0       Synchronous
                1       Asynchronous
        1                       other-device-mode
                0       Synchronous
                1       Asynchronous
        1       BUTTON          button
                0       AnyButton
        1       BOOL            owner-events
                #x8000  AnyModifier
        2                       unused
        4n      LISTofEVENTCLASS        event list



UngrabDeviceButton
        1       CARD8           input extension opcode
        1       18              UngrabDeviceButton opcode
        2       4               request length
        4       WINDOW          grab-window
        2       SETofKEYMASK            modifiers
                #x8000  AnyModifier
        1       CARD8           modifier device
                #x0FF   UseXKeyboard
        1       BUTTON          button
                0       AnyButton
        1       CARD8           grabbed device
        3                       unused



AllowDeviceEvents
        1       CARD8           input extension opcode
        1       19              AllowDeviceEvents opcode
        2       3               request length
        4       TIMESTAMP               time
                0       CurrentTime
        1                       mode
                0       AsyncThisDevice
                1       SyncThisDevice
                2       ReplayThisDevice
                3       AsyncOtherDevices
                4       AsyncAll
                5       SyncAll
        1       CARD8           device id
        2                       unused



GetDeviceFocus
        1       CARD8           input extension opcode
        1       20              GetDeviceFocus opcode
        2       2               request length
        1       CARD8           device
        3                       unused



 =>
        1       1               Reply
        1       20              GetDeviceFocus opcode
        2       CARD16          sequence number
        4       0               reply length
        4       WINDOW          focus
                0       None
                1       PointerRoot
                3       FollowKeyboard
        4       TIMESTAMP       focus time
        1                       revert-to
                0       None
                1       PointerRoot
                2       Parent
                3       FollowKeyboard
        15                      unused



SetDeviceFocus
        1       CARD8           input extension opcode
        1       21              SetDeviceFocus opcode
        2       4               request length
        4       WINDOW          focus
                0       None
                1       PointerRoot
                3       FollowKeyboard
        4       TIMESTAMP               time
                0       CurrentTime
        1                       revert-to
                0       None
                1       PointerRoot
                2       Parent
                3       FollowKeyboard
        1       CARD8           device
        2                       unused



GetFeedbackControl
        1       CARD8           input extension opcode
        1       22              GetFeedbackControl opcode
        2       2               request length
        1       CARD8           device id
        3                       unused



 =>
        1       1               Reply
        1       22              GetFeedbackControl opcode
        2       CARD16          sequence number
        4       m/4                     reply length
        2       n               number of feedbacks supported
        22                      unused
        m       LISTofFEEDBACKSTATE     feedbacks



  FEEDBACKSTATE KBDFEEDBACKSTATE, PTRFEEDBACKSTATE, INTEGERFEEDBACKSTATE
,
  STRINGFEEDBACKSTATE, BELLFEEDBACKSTATE, or LEDFEEDBACKSTATE



  KBDFEEDBACKSTATE
        1       0               feedback class id
        1       CARD8           id of this feedback
        2       20              length
        2       CARD16          pitch
        2       CARD16          duration
        4       CARD32          led_mask
        4       CARD32          led_values
        1                       global_auto_repeat
                0       Off
                1       On
        1       CARD8           click
        1       CARD8           percent
        1                       unused
        32      LISTofCARD8     auto_repeats



  PTRFEEDBACKSTATE
        1       0               feedback class id
        1       CARD8           id of this feedback
        2       12              length
        2                       unused
        2       CARD16          acceleration-numerator
        2       CARD16          acceleration-denominator
        2       CARD16          threshold



  INTEGERFEEDBACKSTATE
        1       0               feedback class id
        1       CARD8           id of this feedback
        2       16              length
        4       CARD32          resolution
        4       INT32           minimum value
        4       INT32           maximum value



  STRINGFEEDBACKSTATE
        1       1               feedback class id
        1       CARD8           id of this feedback
        2       4n+8            length
        2       CARD16          max_symbols
        2       n               number of keysyms supported
        4n      LISTofKEYSYM            key symbols supported



  BELLFEEDBACKSTATE
        1       1               feedback class id
        1       CARD8           id of this feedback
        2       12              length
        1       CARD8           percent
        3                       unused
        2       CARD16          pitch
        2       CARD16          duration



  LEDFEEDBACKSTATE
        1       1               feedback class id
        1       CARD8           id of this feedback
        2       12              length
        4       CARD32          led_mask
        4       BITMASK         led_values
                #x0001  On
                #x0002  Off



ChangeFeedbackControl
        1       CARD8           input extension opcode
        1       23              ChangeFeedbackControl opcode
        2       3+n/4           request length
        4       BITMASK         value-mask (has n bits set to 1)
                #x0001  keyclick-percent
                #x0002  bell-percent
                #x0004  bell-pitch
                #x0008  bell-duration
                #x0010  led
                #x0020  led-mode
                #x0040  key
                #x0080  auto-repeat-mode
                #x0001  string
                #x0001  integer
                #x0001  acceleration-numerator
                #x0002  acceleration-denominator
                #x0004  acceleration-threshold
        1       CARD8           device id
        1       CARD8           feedback class id
        2                       unused
        n       FEEDBACKCLASS



  FEEDBACKCLASS KBDFEEDBACKCTL, PTRFEEDBACKCTL, INTEGERFEEDBACKCTL,
  STRINGFEEDBACKCTL, BELLFEEDBACKCTL, or LEDFEEDBACKCTL



  KBDFEEDBACKCTL
        1       0               feedback class id
        1       CARD8           id of this feedback
        2       20              length
        1       KEYCODE         key
        1                       auto-repeat-mode
                0       Off
                1       On
                2       Default
        1       INT8            key-click-percent
        1       INT8            bell-percent
        2       INT16           bell-pitch
        2       INT16           bell-duration
        4       CARD32          led_mask
        4       CARD32          led_values



  PTRFEEDBACKCTL
        1       1               feedback class id
        1       CARD8           id of this feedback
        2       12              length
        2                       unused
        2       INT16           numerator
        2       INT16           denominator
        2       INT16           threshold



  STRINGCTL
        1       2               feedback class id
        1       CARD8           id of this feedback
        2       4n+8            length
        2                       unused
        2       n               number of keysyms to display
        4n      LISTofKEYSYM            list of key symbols to display



  INTEGERCTL
        1       3               feedback class id
        1       CARD8           id of this feedback
        2       8               length
        4       INT32           integer to display



  LEDCTL
        1       4               feedback class id
        1       CARD8           id of this feedback
        2       12              length
        4       CARD32          led_mask
        4       BITMASK         led_values
                #x0001  On
                #x0002  Off



  BELLCTL
        1       5               feedback class id
        1       CARD8           id of this feedback
        2       8               length
        1       INT8            percent
        3                       unused
        2       INT16           pitch
        2       INT16           duration



GetDeviceKeyMapping
        1       CARD8           input extension opcode
        1       24              GetDeviceKeyMapping opcode
        2       2               request length
        1       CARD8           device
        1       KEYCODE         first-keycode
        1       CARD8           count
        1                       unused



 =>
        1       1               Reply
        1       24              GetDeviceKeyMapping opcode
        2       CARD16          sequence number
        4       nm              reply length (m = count field from the r
equest)
        1       n               keysyms-per-keycode
        23                      unused
        4nm     LISTofKEYSYM            keysyms



ChangeDeviceKeyMapping
        1       CARD8           input extension opcode
        1       25              ChangeDeviceKeyMapping opcode
        2       2+nm            request length
        1       CARD8           device
        1       KEYCODE         first-keycode
        1       m               keysyms-per-keycode
        1       n               keycode-count
        4nm     LISTofKEYSYM            keysyms



GetDeviceModifierMapping
        1       CARD8           input extension opcode
        1       26              GetDeviceModifierMapping opcode
        2       2               request length
        1       CARD8           device
        3                       unused



 =>
        1       1               Reply
        1       26              GetDeviceModifierMapping opcode
        2       CARD16          sequence number
        4       2n              reply length
        1       n               keycodes-per-modifier
        23                      unused
        8n      LISTofKEYCODE           keycodes



SetDeviceModifierMapping
        1       CARD8           input extension opcode
        1       27              SetDeviceModifier opcode
        2       2+2n            request length
        1       CARD8           device
        1       n               keycodes-per-modifier
        2                       unused
        8n      LISTofKEYCODE           keycodes



 =>
        1       1               Reply
        1       27              SetDeviceModifierMapping opcode
        2       CARD16          sequence number
        4       0               reply length
        1                       status
                0       Success
                1       Busy
                2       Failed
        23                      unused



GetDeviceButtonMapping
        1       CARD8           input extension opcode
        1       28              GetDeviceButtonMapping opcode
        2       2               request length
        1       CARD8           device
        3                       unused



 =>
        1       1               Reply
        1       28              GetDeviceButtonMapping opcode
        2       CARD16          sequence number
        4       (n+p)/4         reply length
        1       n               number of elements in map list
        23                      unused
        n       LISTofCARD8                     map
        p                       unused, p=pad(n)



SetDeviceButtonMapping
        1       CARD8           input extension opcode
        1       29              SetDeviceButtonMapping opcode
        2       2+(n+p)/4               request length
        1       CARD8           device
        1       n               length of map
        2                       unused
        n       LISTofCARD8                     map
        p                       unused, p=pad(n)



 =>
        1       1               Reply
        1       29              SetDeviceButtonMapping opcode
        2       CARD16          sequence number
        4       0               reply length
        1                       status
                0       Success
                1       Busy
        23                      unused



QueryDeviceState
        1       CARD8           input extension opcode
        1       30              QueryDeviceState opcode
        2       2               request length
        1       CARD8           device
        3                       unused



 =>
        1       1                       Reply
        1       30                      QueryDeviceState opcode
        2       CARD16                  sequence number
        4       m/4                     reply length
        1       n                       number of input classes
        23                              unused
        m       LISTofINPUTSTATE



  INPUTSTATE    KEYSTATE or BUTTONSTATE or VALUATORSTATE



  KEYSTATE
        1       CARD8           key input class id
        1       36              length
        1       CARD8           num_keys
        1                       unused
        32      LISTofCARD8             status of keys



  BUTTONSTATE
        1       CARD8           button input class id
        1       36              length
        1       CARD8           num_buttons
        1                       unused
        32      LISTofCARD8                     status of buttons



  VALUATORSTATE
        1       CARD8           valuator input class id
        1       4n + 4          length
        1       n               number of valuators
        1                       mode
                #x01    DeviceMode (0 = Relative, 1 = Absolute)
                #x02    ProximityState (0 = InProximity, 1 = OutOfProxim
ity)
        4n      LISTofCARD32            status of valuators



SendExtensionEvent
        1       CARD8                   input extension opcode
        1       31                      SendExtensionEvent opcode
        2       4 + 8n + m              request length
        4       WINDOW                  destination
        1       CARD8                   device
        1       BOOL                    propagate
        2       CARD16                  eventclass count
        1       CARD8                   num_events
        3                               unused
        32n     LISTofEVENTS            events to send
        4m      LISTofEVENTCLASS        desired events



DeviceBell
        1       CARD8           input extension opcode
        1       32              DeviceBell opcode
        2       2               request length
        1       CARD8           device id
        1       CARD8           feedback id
        1       CARD8           feedback class
        1       INT8            percent



SetDeviceValuators
        1       CARD8           input extension opcode
        1       33              SetDeviceValuators opcode
        2       2 + n           request length
        1       CARD8           device id
        1       CARD8           first valuator
        1       n               number of valuators
        1                       unused
        4n      LISTofINT32     valuator values to set



 =>
        1       1                       Reply
        1       33                      SetDeviceValuators opcode
        2       CARD16                  sequence number
        4       0                       reply length
        1       CARD8                   status
                0       Success
                1       AlreadyGrabbed
        23                              unused



GetDeviceControl
        1       CARD8           input extension opcode
        1       34              GetDeviceControl opcode
        2       2               request length
        2       CARD16          device control type
        1       CARD8           device id
        1                       unused



 =>
        1       1                       Reply
        1       34                      GetDeviceControl opcode
        2       CARD16                  sequence number
        4       n/4                     reply length
        1       CARD8                   status
                0                       Success
                1                       AlreadyGrabbed
                3 + first_error         DeviceBusy
        23                              unused
        n                               DEVICESTATE



DEVICESTATE                     DEVICERESOLUTIONSTATE



DEVICERESOLUTIONSTATE
        2       0               control type
        2       8 + 12n         length
        4       n               num_valuators
        4n      LISTOfCARD32    resolution values
        4n      LISTOfCARD32    resolution min_values
        4n      LISTOfCARD32    resolution max_values



ChangeDeviceControl
        1       CARD8           input extension opcode
        1       35              ChangeDeviceControl opcode
        2       2+n/4           request length
        2       CARD16          control type
        1       CARD8           device id
        1                       unused
        n                       DEVICECONTROL



DEVICECONTROL           DEVICERESOLUTIONCTL



DEVICERESOLUTIONCTL
        2       1               control type
        2       8 + 4n          length
        1       CARD8           first_valuator
        1       n               num_valuators
        2                       unused
        4n      LISTOfCARD32    resolution values



 =>
        1       1                       Reply
        1       35                      ChangeDeviceControl opcode
        2       CARD16                  sequence number
        4       0                       reply length
        1       CARD8                   status
                0                       Success
                1                       AlreadyGrabbed
                3 + first_error         DeviceBusy
        23                              unused

   Events

   DeviceKeyPress, DeviceKeyRelease, DeviceButtonPress,
   DeviceButtonRelease, ProximityIn, ProximityOut, and
   DeviceStateNotify events may be followed by zero or more
   DeviceValuator events. DeviceMotionNotify events will be
   followed by one or more DeviceValuator events.



DeviceValuator
        1       CARD8           code
        1       CARD8           device id
        2       CARD16          sequence number
        2       SETofKEYBUTMASK         state
        1       n               number of valuators this device reports
        1       m               number of first valuator in this event
        24      LISTofINT32     valuators



DeviceKeyPress
        1       CARD8           code
        1       KEYCODE         detail
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          root
        4       WINDOW          event
        4       WINDOW          child
                0       None
        2       INT16           root-x
        2       INT16           root-y
        2       INT16           event-x
        2       INT16           event-y
        2       SETofKEYBUTMASK         state
        1       BOOL            same-screen
        1       CARD8           device id
                #x80            MORE_EVENTS follow



DeviceKeyRelease
        1       CARD8           code
        1       KEYCODE         detail
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          root
        4       WINDOW          event
        4       WINDOW          child
                0       None
        2       INT16           root-x
        2       INT16           root-y
        2       INT16           event-x
        2       INT16           event-y
        2       SETofKEYBUTMASK                 state
        1       BOOL            same-screen
        1       CARD8           device id
                #x80            MORE_EVENTS follow



DeviceButtonPress
        1       CARD8           code
        1       BUTTON          detail
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          root
        4       WINDOW          event
        4       WINDOW          child
                0       None
        2       INT16           root-x
        2       INT16           root-y
        2       INT16           event-x
        2       INT16           event-y
        2       SETofKEYBUTMASK         state
        1       BOOL            same-screen
        1       CARD8           device id
                #x80            MORE_EVENTS follow



DeviceButtonRelease
        1       CARD8           code
        1       BUTTON          detail
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          root
        4       WINDOW          event
        4       WINDOW          child
                0       None
        2       INT16           root-x
        2       INT16           root-y
        2       INT16           event-x
        2       INT16           event-y
        2       SETofKEYBUTMASK         state
        1       BOOL            same-screen
        1       CARD8           device id
                #x80            MORE_EVENTS follow



DeviceMotionNotify
        1       CARD8           code
        1                       detail
                0       Normal
                1       Hint
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          root
        4       WINDOW          event
        4       WINDOW          child
                0       None
        2       INT16           root-x
        2       INT16           root-y
        2       INT16           event-x
        2       INT16           event-y
        2       SETofKEYBUTMASK         state
        1       BOOL            same-screen
        1       CARD8           device id
                #x80            MORE_EVENTS follow



DeviceFocusIn
        1       CARD8           code
        1                       detail
                0       Ancestor
                1       Virtual
                2       Inferior
                3       Nonlinear
                4       NonlinearVirtual
                5       Pointer
                6       PointerRoot
                7       None
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          event
        1                       mode
                0       Normal
                1       Grab
                2       Ungrab
                3       WhileGrabbed
        1       CARD8           device id
        18                      unused



DeviceFocusOut
        1       CARD8           code
        1                       detail
                0       Ancestor
                1       Virtual
                2       Inferior
                3       Nonlinear
                4       NonlinearVirtual
                5       Pointer
                6       PointerRoot
                7       None
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          event
        1                       mode
                0       Normal
                1       Grab
                2       Ungrab
                3       WhileGrabbed
        1       CARD8           device id
        18                      unused



ProximityIn
        1       CARD8           code
        1                       unused
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          root
        4       WINDOW          event
        4       WINDOW          child
                0       None
        2       INT16           root-x
        2       INT16           root-y
        2       INT16           event-x
        2       INT16           event-y
        2       SETofKEYBUTMASK                 state
        1       BOOL            same-screen
        1       CARD8           device id
                #x80            MORE_EVENTS follow



ProximityOut
        1       CARD8           code
        1                       unused
        2       CARD16          sequence number
        4       TIMESTAMP               time
        4       WINDOW          root
        4       WINDOW          event
        4       WINDOW          child
                0       None
        2       INT16           root-x
        2       INT16           root-y
        2       INT16           event-x
        2       INT16           event-y
        2       SETofKEYBUTMASK                 state
        1       BOOL            same-screen
        1       CARD8           device id
                #x80            MORE_EVENTS follow

   DeviceStateNotify events may be immediately followed by zero or
   one DeviceKeyStateNotify and/ or zero or more DeviceValuator
   events.



DeviceStateNotify
        1       CARD8           code
        1       CARD8           device id
                #x80            MORE_EVENTS follow
        2       CARD16          sequence number
        4       TIMESTAMP               time
        1       CARD8           num_keys
        1       CARD8           num_buttons
        1       CARD8           num_valuators
        1       CARD8           valuator mode and input classes reported
                #x01    reporting keys
                #x02    reporting buttons
                #x04    reporting valuators
                #x40    device mode (0 = Relative, 1 = Absolute)
                #x80    proximity state (0 = InProximity, 1 = OutOfProxi
mity)
        4       LISTofCARD8             first 32 keys (if reported)
        4       LISTofCARD8             first 32 buttons (if reported)
        12      LISTofCARD32            first 3 valuators (if reported)



DeviceKeyStateNotify
        1       CARD8           code
        1       CARD8           device id
                #x80            MORE_EVENTS follow
        2       CARD16          sequence number
        28      LISTofCARD8             state of keys 33-255



DeviceButtonStateNotify
        1       CARD8           code
        1       CARD8           device id
                #x80            MORE_EVENTS follow
        2       CARD16          sequence number
        28      LISTofCARD8             state of buttons 33-255



DeviceValuator
        1       CARD8           code
        1       CARD8           device id
        2       CARD16          sequence number
        2       SETofKEYBUTMASK         state
        1       n               number of valuators this device reports
        1       n               number of first valuator in this event
        24      LISTofINT32     valuators



DeviceMappingNotify
        1       CARD8           code
        1       CARD8           device id
        2       CARD16          sequence number
        1                       request
                0       MappingModifier
                1       MappingKeyboard
                2       MappingPointer
        1       KEYCODE         first-keycode
        1       CARD8           count
        1                       unused
        4       TIMESTAMP               time
        20                      unused



ChangeDeviceNotify
        1       CARD8           code
        1       CARD8           id of device specified on change request
        2       CARD16          sequence number
        4       TIMESTAMP               time
        1                       request
                0       NewPointer
                1       NewKeyboard
        23                      unused
