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/*-
* Copyright (c) 2008 Ganbold Tsagaankhuu
* 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
* in this position and unchanged.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/wait.h>
#include <err.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define NUM_THREADS 100
static void *
vfork_test(void *threadid __unused)
{
pid_t pid, wpid;
int status;
for (;;) {
pid = vfork();
if (pid == 0)
_exit(0);
else if (pid == -1)
err(1, "Failed to vfork");
else {
wpid = waitpid(pid, &status, 0);
if (wpid == -1)
err(1, "waitpid");
}
}
return (NULL);
}
static void
sighandler(int signo __unused)
{
}
/*
* This program invokes multiple threads and each thread calls
* vfork() system call.
*/
int
main(void)
{
pthread_t threads[NUM_THREADS];
struct sigaction reapchildren;
sigset_t sigchld_mask;
int rc, t;
memset(&reapchildren, 0, sizeof(reapchildren));
reapchildren.sa_handler = sighandler;
if (sigaction(SIGCHLD, &reapchildren, NULL) == -1)
err(1, "Could not sigaction(SIGCHLD)");
sigemptyset(&sigchld_mask);
sigaddset(&sigchld_mask, SIGCHLD);
if (sigprocmask(SIG_BLOCK, &sigchld_mask, NULL) == -1)
err(1, "sigprocmask");
for (t = 0; t < NUM_THREADS; t++) {
rc = pthread_create(&threads[t], NULL, vfork_test, &t);
if (rc)
errc(1, rc, "pthread_create");
}
pause();
return (0);
}
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