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98 lines
2.6 KiB
C
98 lines
2.6 KiB
C
/*-
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* Copyright (c) 2008 Ganbold Tsagaankhuu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define NUM_THREADS 100
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static void *
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vfork_test(void *threadid __unused)
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{
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pid_t pid, wpid;
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int status;
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for (;;) {
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pid = vfork();
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if (pid == 0)
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_exit(0);
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else if (pid == -1)
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err(1, "Failed to vfork");
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else {
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wpid = waitpid(pid, &status, 0);
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if (wpid == -1)
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err(1, "waitpid");
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}
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}
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return (NULL);
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}
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static void
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sighandler(int signo __unused)
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{
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}
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/*
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* This program invokes multiple threads and each thread calls
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* vfork() system call.
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*/
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int
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main(void)
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{
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pthread_t threads[NUM_THREADS];
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struct sigaction reapchildren;
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sigset_t sigchld_mask;
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int rc, t;
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memset(&reapchildren, 0, sizeof(reapchildren));
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reapchildren.sa_handler = sighandler;
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if (sigaction(SIGCHLD, &reapchildren, NULL) == -1)
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err(1, "Could not sigaction(SIGCHLD)");
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sigemptyset(&sigchld_mask);
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sigaddset(&sigchld_mask, SIGCHLD);
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if (sigprocmask(SIG_BLOCK, &sigchld_mask, NULL) == -1)
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err(1, "sigprocmask");
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for (t = 0; t < NUM_THREADS; t++) {
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rc = pthread_create(&threads[t], NULL, vfork_test, &t);
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if (rc)
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errc(1, rc, "pthread_create");
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}
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pause();
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return (0);
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}
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