/*-
 * Copyright (c) 2008 Peter Holm <pho@FreeBSD.org>
 * 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.
 * 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.
 *
 */

/* Call random system calls with random arguments */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/resource.h>
#include <err.h>

#include "stress.h"

static char path[128];
static int num;
static int starting_dir = 0;

static int ignore[] = {
	SYS_syscall,
	SYS_exit,
	SYS_fork,
	11,			/* 11 is obsolete execv */
	SYS_unmount,
	SYS_reboot,
	SYS_vfork,
	109,			/* 109 is old sigblock */
	111,			/* 111 is old sigsuspend */
	SYS_shutdown,
	SYS___syscall,
	SYS_rfork,
	SYS_sigsuspend,
//	SYS_mac_syscall,
	SYS_sigtimedwait,
	SYS_sigwaitinfo,
};

int
setup(int nb)
{
	int i;
	struct rlimit rl;

	umask(0);
	sprintf(path,"%s.%05d", getprogname(), getpid());
	(void)mkdir(path, 0770);
	if (chdir(path) == -1)
		err(1, "chdir(%s), %s:%d", path, __FILE__, __LINE__);
	if ((starting_dir = open(".", 0)) < 0)
		err(1, ".");

	if (op->argc == 1) {
		num = atoi(op->argv[0]);
		for (i = 0; i < sizeof(ignore) / sizeof(ignore[0]); i++)
			if (num == ignore[i]) {
				printf("syscall %d is marked a no test!\n", num);
				exit(1);
			}
	} else {
		num = 0;
		while (num == 0) {
			num = random_int(0, SYS_MAXSYSCALL);
			for (i = 0; i < sizeof(ignore) / sizeof(ignore[0]); i++)
				if (num == ignore[i]) {
					num = 0;
					break;
				}
		}
	}
	if (op->verbose > 1)
		printf("Testing syscall #%d, pid %d\n", num, getpid());

	/* Multiple parallel core dump may panic the kernel with:
	   panic: kmem_malloc(184320): kmem_map too small: 84426752 total allocated
	 */
	rl.rlim_max = rl.rlim_cur = 0;
	if (setrlimit(RLIMIT_CORE, &rl) == -1)
		warn("setrlimit");

	setproctitle("#%d", num);

	return (0);
}

void
cleanup(void)
{
	if (starting_dir != 0) {
		if (fchdir(starting_dir) == -1)
			err(1, "fchdir()");
		(void)system("find . -type d -exec chmod 777 {} \\;");
		(void)system("find . -type f -exec chmod 666 {} \\;");
		(void)system("find . -delete");

		if (chdir("..") == -1)
			err(1, "chdir(..)");
		if (rmdir(path) == -1)
			err(1, "rmdir(%s), %s:%d", path, __FILE__, __LINE__);
	}
	starting_dir = 0;
}

int
test(void)
{
	int i;
	unsigned int arg1, arg2, arg3, arg4, arg5, arg6, arg7;

	for (i = 0; i < 128; i++) {
		arg1 = arc4random();
		arg2 = arc4random();
		arg3 = arc4random();
		arg4 = arc4random();
		arg5 = arc4random();
		arg6 = arc4random();
		arg7 = arc4random();

		if (op->verbose > 3)
			printf("%2d : syscall(%3d, %x, %x, %x, %x, %x, %x, %x)\n",
				i, num, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
		syscall(num, arg1, arg2, arg3, arg4, arg5, arg6, arg7);
	}
#if 0
	while (done_testing == 0)
		sleep(1);
#endif

	return (0);
}