/*
 
Copyright (c) 1990, 1991  X Consortium

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.

 *
 * Copyright 1990, 1991 by UniSoft Group Limited.
 * 
 * Permission to use, copy, modify, distribute, and sell this software and
 * its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and that
 * both that copyright notice and this permission notice appear in
 * supporting documentation, and that the name of UniSoft not be
 * used in advertising or publicity pertaining to distribution of the
 * software without specific, written prior permission.  UniSoft
 * makes no representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * $XConsortium: settimeout.c,v 1.2 94/04/17 21:01:05 rws Exp $
 */

#include	"xtest.h"
#include	<signal.h>

static int 	Alarm_set;

#ifdef OLDSIGNALS
static void	(*osig)();
#else
static struct	sigaction	oact;
#endif

static void
alrm_exit(a)
int a;
{
	exit(TIMEOUT_EXIT);
}

/*
 * Set up a timeout to cause the process to exit in to seconds.  This should
 * only be called from a child process normally.
 */
void
settimeout(to)
int 	to;
{
#ifndef OLDSIGNALS
struct	sigaction	act;
#endif

	Alarm_set = 1;

#if OLDSIGNALS
	osig = signal(SIGALRM, alrm_exit);
#else
	act.sa_handler = alrm_exit;
	act.sa_flags = 0;
	(void) sigemptyset(&act.sa_mask);

	if (sigaction(SIGALRM, &act, &oact) == -1)
		delete("Could not set signal handler in settimeout");
#endif
	(void) alarm((unsigned long)to);
}

/*
 * Clear a previously set timeout.  Return the amount of time remaining.
 */
unsigned long
cleartimeout()
{
unsigned long	timeleft;

	if (Alarm_set == 0)
		return 0;

	timeleft = alarm(0);
#if OLDSIGNALS
	(void) signal(SIGALRM, osig);
#else
	if (sigaction(SIGALRM, &oact, (struct sigaction *)0) == -1)
		delete("Could not reset signal handler in cleartimeout");
#endif
	return(timeleft);
}

