1/*-
2 * Copyright (c) 2008 Ganbold Tsagaankhuu
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 *
27 */
28
29#include <sys/types.h>
30#include <sys/wait.h>
31#include <err.h>
32#include <pthread.h>
33#include <signal.h>
34#include <stdio.h>
35#include <stdlib.h>
36#include <string.h>
37#include <unistd.h>
38
39#define NUM_THREADS 100
40
41static void *
42vfork_test(void *threadid __unused)
43{
44	pid_t pid, wpid;
45	int status;
46
47	for (;;) {
48		pid = vfork();
49		if (pid == 0)
50			_exit(0);
51		else if (pid == -1)
52			err(1, "Failed to vfork");
53		else {
54			wpid = waitpid(pid, &status, 0);
55			if (wpid == -1)
56				err(1, "waitpid");
57		}
58	}
59	return (NULL);
60}
61
62static void
63sighandler(int signo __unused)
64{
65}
66
67/*
68 * This program invokes multiple threads and each thread calls
69 * vfork() system call.
70 */
71int
72main(void)
73{
74	pthread_t threads[NUM_THREADS];
75	struct sigaction reapchildren;
76	sigset_t sigchld_mask;
77	int rc, t;
78
79	memset(&reapchildren, 0, sizeof(reapchildren));
80	reapchildren.sa_handler = sighandler;
81	if (sigaction(SIGCHLD, &reapchildren, NULL) == -1)
82		err(1, "Could not sigaction(SIGCHLD)");
83
84	sigemptyset(&sigchld_mask);
85	sigaddset(&sigchld_mask, SIGCHLD);
86	if (sigprocmask(SIG_BLOCK, &sigchld_mask, NULL) == -1)
87		err(1, "sigprocmask");
88
89	for (t = 0; t < NUM_THREADS; t++) {
90		rc = pthread_create(&threads[t], NULL, vfork_test, &t);
91		if (rc)
92			errc(1, rc, "pthread_create");
93	}
94	pause();
95	return (0);
96}
97