7b6927c4af
trivial handler for SIGCHLD is installed, and SIGCHLD is blocked, to not abandon our zombies to init(8). This way, the zombies are around slightly longer, allowing to actually exercise the logic for p_pwait use by the test. MFC after: 1 week
100 lines
2.7 KiB
C
100 lines
2.7 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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__FBSDID("$FreeBSD$");
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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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