/*-
 * 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.
 *
 */

/* Main program for all test programs */

#include <sys/wait.h>
#include <sys/stat.h>

#include <stdio.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <err.h>
#include <errno.h>

#include "stress.h"

volatile int done_testing;
static int cleanupcalled = 0;
char *home;

static pid_t *r;

static void
handler(int i __unused)
{
        int j;

        done_testing = 1;
        for (j = 0; j < op->incarnations; j++) {
                if (op->verbose > 2)
                        printf("handler: kill -HUP %d\n", r[j]);
                if (r[j] != 0 && kill(r[j], SIGHUP) == -1)
                        if (errno != ESRCH)
                                warn("kill(%d, SIGHUP), %s:%d", r[j], __FILE__, __LINE__);
        }
        if (op->kill == 1) {
                sleep(5);
                /* test programs may have blocked for the SIGHUP, so try harder */
                for (j = 0; j < op->incarnations; j++) {
                        if (op->verbose > 2)
                                printf("handler: kill -KILL %d\n", r[j]);
                        if (r[j] != 0)
                                (void) kill(r[j], SIGKILL);
                }
        }
}

static void
run_test_handler(int i __unused)
{

        done_testing = 1;
}

static void
exit_handler(int i __unused)
{

        _exit(1);
}

static void
callcleanup(void)
{
        if (cleanupcalled == 0)
                cleanup();
        cleanupcalled = 1;
}

static void
run_tests(int i)
{
        time_t start;
        int e;

        signal(SIGHUP, run_test_handler);
        signal(SIGINT, exit_handler);
        atexit(callcleanup);
        setup(i);
        if ((strcmp(getprogname(), "run") != 0) && (op->nodelay == 0))
                sleep(random_int(1,10));
        e = 0;
        start = time(NULL);
        while (done_testing == 0 && e == 0 &&
                        (time(NULL) - start) < op->run_time) {
                e = test();
        }
        callcleanup();
        exit(e);
}

static void
run_incarnations(void)
{
        int e, i, s;

        e = 0;
        signal(SIGHUP, handler);
        for (i = 0; i < op->incarnations && done_testing == 0; i++) {
                if ((r[i] = fork()) == 0) {
                        run_tests(i);
                }
                if (r[i] < 0) {
                        warn("fork(), %s:%d", __FILE__, __LINE__);
                        r[i] = 0;
                        break;
                }
        }
        for (i = 0; i < op->incarnations; i++) {
                if (r[i] != 0 && waitpid(r[i], &s, 0) == -1)
                        warn("waitpid(%d), %s:%d", r[i], __FILE__, __LINE__);
                if (s != 0)
                        e = 1;
        }

        exit(e);
}

static int
run_test(void)
{
        pid_t p;
        time_t start;
        int status = 0;

        if (random_int(1,100) > op->load)
                return (status);

        show_status();

        start = time(NULL);
        done_testing = 0;
        fflush(stdout);
        rmval();
        p = fork();
        if (p == 0)
                run_incarnations();
        if (p < 0)
                err(1, "fork() in %s:%d", __FILE__, __LINE__);
        while (done_testing != 1 &&
                        (time(NULL) - start) < op->run_time) {
                sleep(1);
                if (waitpid(p, &status, WNOHANG) == p)
                        return (status != 0);
        }
        if (kill(p, SIGHUP) == -1)
                warn("kill(%d, SIGHUP), %s:%d", p, __FILE__, __LINE__);

        if (waitpid(p, &status, 0) == -1)
                err(1, "waitpid(%d), %s:%d", p, __FILE__, __LINE__);

        return (status != 0);
}

int
main(int argc, char **argv)
{
        struct stat sb;
        int status = 0;

        options(argc, argv);

        umask(0);
        if (stat(op->wd, &sb) == -1) {
                if (mkdir(op->wd, 0770) == -1)
                        if (errno != EEXIST)
                                err(1, "mkdir(%s) %s:%d", op->wd, __FILE__, __LINE__);
        } else if ((sb.st_mode & S_IRWXU) == 0)
                errx(1, "No RWX access to %s", op->wd);
        if (stat(op->cd, &sb) == -1) {
                if (mkdir(op->cd, 0770) == -1)
                        if (errno != EEXIST)
                                err(1, "mkdir(%s) %s:%d", op->cd, __FILE__, __LINE__);
        }
        if ((home = getcwd(NULL, 0)) == NULL)
                err(1, "getcwd(), %s:%d",  __FILE__, __LINE__);
        if (chdir(op->wd) == -1)
                err(1, "chdir(%s) %s:%d", op->wd, __FILE__, __LINE__);

        r = (pid_t *)calloc(1, op->incarnations * sizeof(pid_t));

        status = run_test();

        return (status);
}