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#define _DEFAULT_SOURCE /* for getopt() and optarg */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <stdarg.h>
#include <linux/input.h>
#include <linux/uinput.h>
#define VERSION "0.0.1"
#define DEFAULT_DELAY_MS 30
#define DEFAULT_KBD "/dev/input/by-id/usb-Marson_Marson_Keyboard_and_Mouse_Link_Ver:ps2120L-event-kbd"
const char *self;
int debugging = 0; /* -v */
const char *keyboard_dev = DEFAULT_KBD; /* -k */
int delay_ms = DEFAULT_DELAY_MS; /* -d */
/* variadic macros are apparently C99 and not just a GNU extension */
void logmsg(const char *prefix, const char *fmt, ...) {
va_list ap;
va_start(ap, fmt);
fprintf(stderr, "%s: %s: ", self, prefix);
vfprintf(stderr, fmt, ap);
va_end(ap);
fputc('\n', stderr);
}
#define die(fmt, ...) { logmsg("fatal", fmt, ##__VA_ARGS__); exit(1); };
#define warn(fmt, ...) { logmsg("warning", fmt, ##__VA_ARGS__); };
#define info(fmt, ...) { logmsg("info", fmt, ##__VA_ARGS__); };
#define debug(fmt, ...) { if(debugging) logmsg("debug", fmt, ##__VA_ARGS__); };
void set_self(const char *argv0) {
char *p;
self = argv0;
p = strrchr(self, '/');
if(p) self = p + 1;
}
void print_help(void) {
/* helptext comes from usage.c, which gets generated by mkusage.pl,
from the content in the the .rst file. */
extern const char *helptext[];
const char **helpline;
puts("marsond " VERSION ", by B. Watson <urchlay@slackware.uk>, WTFPL");
puts("Usage:");
for(helpline = helptext; *helpline; helpline++)
puts(*helpline);
}
void version(void) {
puts(VERSION);
}
void parse_args(int argc, char **argv) {
int opt;
opterr = 0;
if(argc >= 2) {
if(strcmp(argv[1], "--help") == 0) {
print_help();
exit(0);
} else if(strcmp(argv[1], "--version") == 0) {
version();
exit(0);
}
}
while( (opt = getopt(argc, argv, "d:hk:vV")) != -1) {
switch(opt) {
case 'v': debugging++; break;
case 'd': delay_ms = atoi(optarg); break;
case 'k': keyboard_dev = optarg; break;
case 'h': print_help(); exit(0); break;
case 'V': version(); exit(0); break;
case '?': die("invalid option (try --help)"); break;
default: print_help(); exit(1); break;
}
}
if(delay_ms < 1) die("invalid -d argument");
}
void daemonize(void) {
int pid;
pid = fork();
if(pid < 0) {
die("fork() failed");
} else if(pid) {
/* parent */
exit(0);
}
/* we are the child here */
setsid();
pid = fork();
if(pid < 0) {
die("fork() failed");
} else if(pid) {
/* 2nd generation parent */
info("forked to background, PID %d\n", pid);
exit(0);
}
/* we are the grandchild here */
chdir("/");
close(0);
close(1);
close(2);
}
int main(int argc, char **argv) {
int infd, outfd, i;
struct uinput_user_dev dev;
struct input_event ev;
set_self(argv[0]);
debug("starting up");
parse_args(argc, argv);
if((outfd = open("/dev/uinput", O_WRONLY | O_NONBLOCK)) >= 0) {
debug("opened /dev/uinput");
} else {
die("failed to open /dev/uinput: %s", strerror(errno));
}
if((infd = open(keyboard_dev, O_RDONLY)) >= 0) {
debug("opened %s", keyboard_dev);
} else {
die("failed to open %s: %s", keyboard_dev, strerror(errno));
}
if(ioctl(infd, EVIOCGRAB, 1) >= 0) {
debug("grabbed %s", keyboard_dev);
} else {
die("failed to grab %s: %s", keyboard_dev, strerror(errno));
}
if(ioctl(outfd, UI_SET_EVBIT, EV_KEY) >= 0) {
debug("UI_SET_EVBIT OK");
} else {
die("UI_SET_EVBIT failed: %s", strerror(errno));
}
for(i = 0; i < KEY_MAX; i++) {
if(ioctl(outfd, UI_SET_KEYBIT, i) >= 0) {
/* we don't wanna be *that* verbose */
} else {
die("UI_SET_EVBIT failed: %s", strerror(errno));
}
}
debug("UI_SET_KEYBIT OK");
memset(&dev, 0, sizeof(dev));
snprintf(dev.name, UINPUT_MAX_NAME_SIZE, "marsond virtual keyboard");
dev.id.bustype = BUS_USB;
dev.id.vendor = 0x69;
dev.id.product = 0x666;
dev.id.version = 1;
if(write(outfd, &dev, sizeof(dev)) >= 0) {
debug("wrote dev structure to /dev/uinput");
} else {
die("write to /dev/uinput failed: %s", strerror(errno));
}
if(ioctl(outfd, UI_DEV_CREATE) >= 0) {
debug("created virtual keyboard device");
} else {
die("UI_DEV_CREATE failed: %s", strerror(errno));
}
if(!debugging) daemonize();
/* note: don't call die() unless debugging is true, since daemonize()
closes our stderr (there's nowhere for the error message to print). */
while(1) {
if(read(infd, &ev, sizeof(ev)) < 0) {
if(debugging)
die("read from %s failed: %s", keyboard_dev, strerror(errno));
}
debug("event: type %d, code %d, value %d\n",
ev.type, ev.code, ev.value);
if(ev.type == EV_KEY && ev.code == KEY_ENTER && ev.value == 0) {
debug("got Enter key release, delaying %d ms", delay_ms);
usleep(delay_ms * 1000);
}
if(write(outfd, &ev, sizeof(ev)) < 0) {
if(debugging)
die("write to /dev/uinput failed: %s", strerror(errno));
}
}
exit(1);
}
/*
for the A key:
event: type 4, code 4, value 458756
event: type 1, code 30, value 1
event: type 0, code 0, value 0
event: type 4, code 4, value 458756
event: type 1, code 30, value 0
event: type 0, code 0, value 0
for Enter:
event: type 4, code 4, value 458792
event: type 1, code 28, value 1
event: type 0, code 0, value 0
event: type 4, code 4, value 458792
event: type 1, code 28, value 0
event: type 0, code 0, value 0
*/
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