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      1 /*	$NetBSD: alarm.c,v 1.11 2012/06/25 22:32:43 abs Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #if defined(LIBC_SCCS) && !defined(lint)
     34 #if 0
     35 static char sccsid[] = "@(#)alarm.c	8.1 (Berkeley) 6/4/93";
     36 #else
     37 __RCSID("$NetBSD: alarm.c,v 1.11 2012/06/25 22:32:43 abs Exp $");
     38 #endif
     39 #endif /* LIBC_SCCS and not lint */
     40 
     41 /*
     42  * Backwards compatible alarm.
     43  */
     44 #include "namespace.h"
     45 #include <sys/time.h>
     46 #include <unistd.h>
     47 
     48 #ifdef __weak_alias
     49 __weak_alias(alarm,_alarm)
     50 #endif
     51 
     52 unsigned int
     53 alarm(unsigned int secs)
     54 {
     55 	struct itimerval it, oitv;
     56 	struct itimerval *itp = &it;
     57 
     58 	timerclear(&itp->it_interval);
     59 	itp->it_value.tv_sec = secs;
     60 	itp->it_value.tv_usec = 0;
     61 	if (setitimer(ITIMER_REAL, itp, &oitv) == -1)
     62 		return (unsigned int) -1;
     63 	if (oitv.it_value.tv_usec)
     64 		oitv.it_value.tv_sec++;
     65 	return (unsigned int)oitv.it_value.tv_sec;
     66 }
     67