4.3BSD/usr/src/usr.lib/libU77/alarm_.c

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/*
 * Copyright (c) 1980 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)alarm_.c	5.1	6/7/85
 */

/*
 * set an alarm time, arrange for user specified action, and return.
 *
 * calling sequence:
 *	integer	flag
 *	external alfunc
 *	lastiv = alarm (intval, alfunc)
 * where:
 *	intval	= the alarm interval in seconds; 0 turns off the alarm.
 *	alfunc	= the function to be called after the alarm interval,
 *
 *	The returned value will be the time remaining on the last alarm.
 */

#include <signal.h>

long alarm_(sec, proc)
long	*sec;
int	(* proc)();
{
	register long	lt;

	lt = alarm(1000);	/* time to maneuver */

	if (*sec)
		signal(SIGALRM, proc);

	alarm(*sec);
	return(lt);
}