/*-
 * 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        11,                     /* 11 is obsolete execv */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);
}