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
41 static void *
vfork_test(void * threadid __unused)42 vfork_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
62 static void
sighandler(int signo __unused)63 sighandler(int signo __unused)
64 {
65 }
66
67 /*
68 * This program invokes multiple threads and each thread calls
69 * vfork() system call.
70 */
71 int
main(void)72 main(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