2 * Copyright (c) 2008 Ganbold Tsagaankhuu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/types.h>
42 #define NUM_THREADS 100
45 vfork_test(void *threadid __unused)
55 err(1, "Failed to vfork");
57 wpid = waitpid(pid, &status, 0);
66 sighandler(int signo __unused)
71 * This program invokes multiple threads and each thread calls
72 * vfork() system call.
77 pthread_t threads[NUM_THREADS];
78 struct sigaction reapchildren;
79 sigset_t sigchld_mask;
82 memset(&reapchildren, 0, sizeof(reapchildren));
83 reapchildren.sa_handler = sighandler;
84 if (sigaction(SIGCHLD, &reapchildren, NULL) == -1)
85 err(1, "Could not sigaction(SIGCHLD)");
87 sigemptyset(&sigchld_mask);
88 sigaddset(&sigchld_mask, SIGCHLD);
89 if (sigprocmask(SIG_BLOCK, &sigchld_mask, NULL) == -1)
90 err(1, "sigprocmask");
92 for (t = 0; t < NUM_THREADS; t++) {
93 rc = pthread_create(&threads[t], NULL, vfork_test, &t);
95 errc(1, rc, "pthread_create");