usr/src/lib/libbc/libc/gen/common/alarm.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1990 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * Backwards compatible alarm.
  31  */
  32 #include <sys/time.h>
  33
  34 unsigned int
  35 alarm(unsigned int secs)
  36 {
  37         struct itimerval it, oitv;
  38         struct itimerval *itp = &it;
  39
  40         timerclear(&itp->it_interval);
  41         itp->it_value.tv_sec = secs;
  42         itp->it_value.tv_usec = 0;
  43         if (setitimer(ITIMER_REAL, itp, &oitv) < 0)
  44                 return (-1);
  45         if (oitv.it_value.tv_usec)
  46                 oitv.it_value.tv_sec++;
  47         return (oitv.it_value.tv_sec);
  48 }