config root man

/*-
 * 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: release/9.1.0/tools/test/pthread_vfork/pthread_vfork_test.c 185695 2008-12-06 13:23:53Z ganbold $");

#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

void *
vfork_test(void *threadid)
{
	pid_t pid;

	for (;;) {
		pid = vfork();
		if (pid == 0)
			_exit(0);
		else if (pid == -1)
			err(1, "Failed to vfork");
	}
	return (NULL);
}

/*
 * This program invokes multiple threads and each thread calls
 * vfork() system call.
 */
int
main(void)
{
	pthread_t threads[NUM_THREADS];
	struct sigaction reapchildren;
	int rc, t;

	memset(&reapchildren, 0, sizeof(reapchildren));
	reapchildren.sa_handler = SIG_IGN;

	/* Automatically reap zombies. */
	if (sigaction(SIGCHLD, &reapchildren, NULL) == -1)
		err(1, "Could not sigaction(SIGCHLD)");

	for (t = 0; t < NUM_THREADS; t++) {
		rc = pthread_create(&threads[t], NULL, vfork_test, (void *)t);
		if (rc)
			errc(1, rc, "pthread_create");
	}
	return (0);
}