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+/*	$NetBSD: machdep.c,v 1.20 2012/12/01 11:37:27 mbalmer Exp $	*/
+
+/*
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Timothy C. Stoehr.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+#include <time.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)machdep.c	8.1 (Berkeley) 5/31/93";
+#else
+__RCSID("$NetBSD: machdep.c,v 1.20 2012/12/01 11:37:27 mbalmer Exp $");
+#endif
+#endif /* not lint */
+
+/*
+ * machdep.c
+ *
+ * This source herein may be modified and/or distributed by anybody who
+ * so desires, with the following restrictions:
+ *    1.)  No portion of this notice shall be removed.
+ *    2.)  Credit shall not be taken for the creation of this source.
+ *    3.)  This code is not to be traded, sold, or used for personal
+ *         gain or profit.
+ *
+ */
+
+/* Included in this file are all system dependent routines.  Extensive use
+ * of #ifdef's will be used to compile the appropriate code on each system:
+ *
+ *    UNIX:        all UNIX systems.
+ *    UNIX_BSD4_2: UNIX BSD 4.2 and later, UTEK, (4.1 BSD too?)
+ *    UNIX_SYSV:   UNIX system V
+ *    UNIX_V7:     UNIX version 7
+ *
+ * All UNIX code should be included between the single "#ifdef UNIX" at the
+ * top of this file, and the "#endif" at the bottom.
+ *
+ * To change a routine to include a new UNIX system, simply #ifdef the
+ * existing routine, as in the following example:
+ *
+ *   To make a routine compatible with UNIX system 5, change the first
+ *   function to the second:
+ *
+ *      md_function()
+ *      {
+ *         code;
+ *      }
+ *
+ *      md_function()
+ *      {
+ *      #ifdef UNIX_SYSV
+ *         sys5code;
+ *      #else
+ *         code;
+ *      #endif
+ *      }
+ *
+ * Appropriate variations of this are of course acceptable.
+ * The use of "#elseif" is discouraged because of non-portability.
+ * If the correct #define doesn't exist, "UNIX_SYSV" in this case, make it up
+ * and insert it in the list at the top of the file.  Alter the CFLAGS
+ * in you Makefile appropriately.
+ *
+ */
+
+#ifdef UNIX
+
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <pwd.h>
+
+#ifdef UNIX_BSD4_2
+#include <sys/time.h>
+#endif
+
+#ifdef UNIX_SYSV
+#include <time.h>
+#endif
+
+#include <signal.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <unistd.h>
+#include "rogue.h"
+#include "pathnames.h"
+
+/* md_slurp:
+ *
+ * This routine throws away all keyboard input that has not
+ * yet been read.  It is used to get rid of input that the user may have
+ * typed-ahead.
+ *
+ * This function is not necessary, so it may be stubbed.  The might cause
+ * message-line output to flash by because the game has continued to read
+ * input without waiting for the user to read the message.  Not such a
+ * big deal.
+ */
+
+void
+md_slurp(void)
+{
+	(void)fpurge(stdin);
+}
+
+/* md_heed_signals():
+ *
+ * This routine tells the program to call particular routines when
+ * certain interrupts/events occur:
+ *
+ *      SIGINT: call onintr() to interrupt fight with monster or long rest.
+ *      SIGQUIT: call byebye() to check for game termination.
+ *      SIGHUP: call error_save() to save game when terminal hangs up.
+ *
+ *		On VMS, SIGINT and SIGQUIT correspond to ^C and ^Y.
+ *
+ * This routine is not strictly necessary and can be stubbed.  This will
+ * mean that the game cannot be interrupted properly with keyboard
+ * input, this is not usually critical.
+ */
+
+void
+md_heed_signals(void)
+{
+	signal(SIGINT, onintr);
+	signal(SIGQUIT, byebye);
+	signal(SIGHUP, error_save);
+}
+
+/* md_ignore_signals():
+ *
+ * This routine tells the program to completely ignore the events mentioned
+ * in md_heed_signals() above.  The event handlers will later be turned on
+ * by a future call to md_heed_signals(), so md_heed_signals() and
+ * md_ignore_signals() need to work together.
+ *
+ * This function should be implemented or the user risks interrupting
+ * critical sections of code, which could cause score file, or saved-game
+ * file, corruption.
+ */
+
+void
+md_ignore_signals(void)
+{
+	signal(SIGQUIT, SIG_IGN);
+	signal(SIGINT, SIG_IGN);
+	signal(SIGHUP, SIG_IGN);
+}
+
+/* md_get_file_id():
+ *
+ * This function returns an integer that uniquely identifies the specified
+ * file.  It need not check for the file's existence.  In UNIX, the inode
+ * number is used.
+ *
+ * This function is used to identify saved-game files.
+ */
+
+int
+md_get_file_id(const char *fname)
+{
+	struct stat sbuf;
+
+	if (stat(fname, &sbuf)) {
+		return(-1);
+	}
+	return((int)sbuf.st_ino);
+}
+
+/* md_link_count():
+ *
+ * This routine returns the number of hard links to the specified file.
+ *
+ * This function is not strictly necessary.  On systems without hard links
+ * this routine can be stubbed by just returning 1.
+ */
+
+int
+md_link_count(const char *fname)
+{
+	struct stat sbuf;
+
+	stat(fname, &sbuf);
+	return((int)sbuf.st_nlink);
+}
+
+/* md_gct(): (Get Current Time)
+ *
+ * This function returns the current year, month(1-12), day(1-31), hour(0-23),
+ * minute(0-59), and second(0-59).  This is used for identifying the time
+ * at which a game is saved.
+ *
+ * This function is not strictly necessary.  It can be stubbed by returning
+ * zeros instead of the correct year, month, etc.  If your operating
+ * system doesn't provide all of the time units requested here, then you
+ * can provide only those that it does, and return zeros for the others.
+ * If you cannot provide good time values, then users may be able to copy
+ * saved-game files and play them.
+ */
+
+void
+md_gct(struct rogue_time *rt_buf)
+{
+	struct tm *t;
+	time_t seconds;
+
+	time(&seconds);
+	t = localtime(&seconds);
+
+	rt_buf->year = t->tm_year;
+	rt_buf->month = t->tm_mon + 1;
+	rt_buf->day = t->tm_mday;
+	rt_buf->hour = t->tm_hour;
+	rt_buf->minute = t->tm_min;
+	rt_buf->second = t->tm_sec;
+}
+
+/* md_gfmt: (Get File Modification Time)
+ *
+ * This routine returns a file's date of last modification in the same format
+ * as md_gct() above.
+ *
+ * This function is not strictly necessary.  It is used to see if saved-game
+ * files have been modified since they were saved.  If you have stubbed the
+ * routine md_gct() above by returning constant values, then you may do
+ * exactly the same here.
+ * Or if md_gct() is implemented correctly, but your system does not provide
+ * file modification dates, you may return some date far in the past so
+ * that the program will never know that a saved-game file being modified.
+ * You may also do this if you wish to be able to restore games from
+ * saved-games that have been modified.
+ */
+
+void
+md_gfmt(const char *fname, struct rogue_time *rt_buf)
+{
+	struct stat sbuf;
+	time_t seconds;
+	struct tm *t;
+
+	stat(fname, &sbuf);
+	seconds = sbuf.st_mtime;
+	t = localtime(&seconds);
+
+	rt_buf->year = t->tm_year;
+	rt_buf->month = t->tm_mon + 1;
+	rt_buf->day = t->tm_mday;
+	rt_buf->hour = t->tm_hour;
+	rt_buf->minute = t->tm_min;
+	rt_buf->second = t->tm_sec;
+}
+
+/* md_df: (Delete File)
+ *
+ * This function deletes the specified file, and returns true (1) if the
+ * operation was successful.  This is used to delete saved-game files
+ * after restoring games from them.
+ *
+ * Again, this function is not strictly necessary, and can be stubbed
+ * by simply returning 1.  In this case, saved-game files will not be
+ * deleted and can be replayed.
+ */
+
+boolean
+md_df(const char *fname)
+{
+	if (unlink(fname)) {
+		return(0);
+	}
+	return(1);
+}
+
+/* md_gln: (Get login name)
+ *
+ * This routine returns the login name of the user.  This string is
+ * used mainly for identifying users in score files.
+ *
+ * A dummy string may be returned if you are unable to implement this
+ * function, but then the score file would only have one name in it.
+ */
+
+const char *
+md_gln(void)
+{
+	struct passwd *p;
+
+	if (!(p = getpwuid(getuid())))
+		return NULL;
+	return p->pw_name;
+}
+
+/* md_sleep:
+ *
+ * This routine causes the game to pause for the specified number of
+ * seconds.
+ *
+ * This routine is not particularly necessary at all.  It is used for
+ * delaying execution, which is useful to this program at some times.
+ */
+
+void
+md_sleep(int nsecs)
+{
+	(void)sleep(nsecs);
+}
+
+/* md_getenv()
+ *
+ * This routine gets certain values from the user's environment.  These
+ * values are strings, and each string is identified by a name.  The names
+ * of the values needed, and their use, is as follows:
+ *
+ *   ROGUEOPTS
+ *     A string containing the various game options.  This need not be
+ *     defined.
+ *   HOME
+ *     The user's home directory.  This is only used when the user specifies
+ *     '~' as the first character of a saved-game file.  This string need
+ *     not be defined.
+ *   SHELL
+ *     The user's favorite shell.  If not found, "/bin/sh" is assumed.
+ *
+ * If your system does not provide a means of searching for these values,
+ * you will have to do it yourself.  None of the values above really need
+ * to be defined; you can get by with simply always returning zero.
+ * Returning zero indicates that their is no defined value for the
+ * given string.
+ */
+
+char *
+md_getenv(const char *name)
+{
+	char *value;
+
+	value = getenv(name);
+
+	return(value);
+}
+
+/* md_malloc()
+ *
+ * This routine allocates, and returns a pointer to, the specified number
+ * of bytes.  This routines absolutely MUST be implemented for your
+ * particular system or the program will not run at all.  Return zero
+ * when no more memory can be allocated.
+ */
+
+void *
+md_malloc(size_t n)
+{
+	char *t;
+
+	t = malloc(n);
+	return(t);
+}
+
+/* md_gseed() (Get Seed)
+ *
+ * This function returns a seed for the random number generator (RNG).  This
+ * seed causes the RNG to begin generating numbers at some point in its
+ * sequence.  Without a random seed, the RNG will generate the same set
+ * of numbers, and every game will start out exactly the same way.  A good
+ * number to use is the process id, given by getpid() on most UNIX systems.
+ *
+ * You need to find some single random integer, such as:
+ *   process id.
+ *   current time (minutes + seconds) returned from md_gct(), if implemented.
+ *
+ * It will not help to return "get_rand()" or "rand()" or the return value of
+ * any pseudo-RNG.  If you don't have a random number, you can just return 1,
+ * but this means your games will ALWAYS start the same way, and will play
+ * exactly the same way given the same input.
+ */
+
+int
+md_gseed(void)
+{
+	time_t seconds;
+
+	time(&seconds);
+	return((int)seconds);
+}
+
+/* md_exit():
+ *
+ * This function causes the program to discontinue execution and exit.
+ * This function must be implemented or the program will continue to
+ * hang when it should quit.
+ */
+
+void
+md_exit(int status)
+{
+	exit(status);
+}
+
+/* md_lock():
+ *
+ * This function is intended to give the user exclusive access to the score
+ * file.  It does so by flock'ing the score file.  The full path name of the
+ * score file should be defined for any particular site in rogue.h.  The
+ * constants _PATH_SCOREFILE defines this file name.
+ *
+ * When the parameter 'l' is non-zero (true), a lock is requested.  Otherwise
+ * the lock is released.
+ */
+
+void
+md_lock(boolean l)
+{
+	static int fd = -1;
+	short tries;
+
+	if (l) {
+		setegid(egid);
+		if ((fd = open(_PATH_SCOREFILE, O_RDONLY)) < 1) {
+			setegid(gid);
+			messagef(0, "cannot lock score file");
+			return;
+		}
+		setegid(gid);
+		for (tries = 0; tries < 5; tries++)
+			if (!flock(fd, LOCK_EX|LOCK_NB))
+				return;
+	} else {
+		(void)flock(fd, LOCK_UN|LOCK_NB);
+		(void)close(fd);
+	}
+}
+
+/* md_shell():
+ *
+ * This function spawns a shell for the user to use.  When this shell is
+ * terminated, the game continues.
+ *
+ * It is important that the game not give the shell the privileges the
+ * game uses to access the scores file. This version of the game runs
+ * with privileges low by default; only the saved gid (if setgid) or uid
+ * (if setuid) will be privileged, but that privilege is discarded by
+ * exec().
+ */
+
+void
+md_shell(const char *shell)
+{
+	int w;
+	pid_t pid;
+
+	pid = fork();
+	switch (pid) {
+	case -1:
+		break;
+	case 0:
+		execl(shell, shell, (char *)NULL);
+		_exit(255);
+	default:
+		waitpid(pid, &w, 0);
+		break;
+	}
+}
+
+#endif /* UNIX */