libc/unistd/alarm.c

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * 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.
 * 4. 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)alarm.c	8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
//__FBSDID("$FreeBSD: /repoman/r/ncvs/src/lib/libc/gen/alarm.c,v 1.3 2007/01/09 00:27:53 imp Exp $");

/*
 * Backwards compatible alarm.
 */
#include <sys/time.h>
#include <unistd.h>

unsigned int
alarm(secs)
	unsigned int secs;
{
	struct itimerval it, oitv;
	struct itimerval *itp = &it;

    itp->it_interval.tv_usec = 0;
    itp->it_interval.tv_sec = 0;
	itp->it_value.tv_sec = secs;
	itp->it_value.tv_usec = 0;
	if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
#if 1 /* BIONIC: Same behaviour than GLibc for errors */
		return 0;
#else
		return (-1);
#endif
	if (oitv.it_value.tv_usec)
		oitv.it_value.tv_sec++;
	return (oitv.it_value.tv_sec);
}