usr/src/cmd/dtrace/test/tst/common/proc/tst.sigwait.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2007 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 #include <signal.h>
  30 #include <time.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <errno.h>
  34 #include <string.h>
  35
  36 int
  37 main(int argc, char **argv)
  38 {
  39         struct sigevent ev;
  40         struct itimerspec ts;
  41         sigset_t set;
  42         timer_t tid;
  43         char *cmd = argv[0];
  44         int sig;
  45
  46         ev.sigev_notify = SIGEV_SIGNAL;
  47         ev.sigev_signo = SIGUSR1;
  48
  49         if (timer_create(CLOCK_REALTIME, &ev, &tid) == -1) {
  50                 (void) fprintf(stderr, "%s: cannot create CLOCK_HIGHRES "
  51                     "timer: %s\n", cmd, strerror(errno));
  52                 exit(EXIT_FAILURE);
  53         }
  54
  55         (void) sigemptyset(&set);
  56         (void) sigaddset(&set, SIGUSR1);
  57         (void) sigprocmask(SIG_BLOCK, &set, NULL);
  58
  59         ts.it_value.tv_sec = 1;
  60         ts.it_value.tv_nsec = 0;
  61         ts.it_interval.tv_sec = 0;
  62         ts.it_interval.tv_nsec = NANOSEC / 2;
  63
  64         if (timer_settime(tid, TIMER_RELTIME, &ts, NULL) == -1) {
  65                 (void) fprintf(stderr, "%s: timer_settime() failed: %s\n",
  66                     cmd, strerror(errno));
  67                 exit(EXIT_FAILURE);
  68         }
  69
  70         for (;;) {
  71                 (void) sigwait(&set, &sig);
  72         }
  73
  74         /*NOTREACHED*/
  75         return (0);
  76 }