/*-
 * Copyright (c) 2007-2009 Dag-Erling Smørgrav
 * 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/types.h>
#include <sys/fcntl.h>

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

#include <libutil.h>

/*
 * Test that flopen() can create a file.
 */
const char *
test_flopen_create(void)
{
        const char *fn = "test_flopen_create";
        const char *result = NULL;
        int fd;

        unlink(fn);
        fd = flopen(fn, O_RDWR|O_CREAT, 0640);
        if (fd < 0) {
                result = strerror(errno);
        } else {
                close(fd);
        }
        unlink(fn);
        return (result);
}

/*
 * Test that flopen() can open an existing file.
 */
const char *
test_flopen_open(void)
{
        const char *fn = "test_flopen_open";
        const char *result = NULL;
        int fd;

        fd = open(fn, O_RDWR|O_CREAT, 0640);
        if (fd < 0) {
                result = strerror(errno);
        } else {
                close(fd);
                fd = flopen(fn, O_RDWR);
                if (fd < 0) {
                        result = strerror(errno);
                } else {
                        close(fd);
                }
        }
        unlink(fn);
        return (result);
}

/*
 * Test that flopen() can lock against itself
 */
const char *
test_flopen_lock_self(void)
{
        const char *fn = "test_flopen_lock_self";
        const char *result = NULL;
        int fd1, fd2;

        unlink(fn);
        fd1 = flopen(fn, O_RDWR|O_CREAT, 0640);
        if (fd1 < 0) {
                result = strerror(errno);
        } else {
                fd2 = flopen(fn, O_RDWR|O_NONBLOCK);
                if (fd2 >= 0) {
                        result = "second open succeeded";
                        close(fd2);
                }
                close(fd1);
        }
        unlink(fn);
        return (result);
}

/*
 * Test that flopen() can lock against other processes
 */
const char *
test_flopen_lock_other(void)
{
        const char *fn = "test_flopen_lock_other";
        const char *result = NULL;
        volatile int fd1, fd2;

        unlink(fn);
        fd1 = flopen(fn, O_RDWR|O_CREAT, 0640);
        if (fd1 < 0) {
                result = strerror(errno);
        } else {
                fd2 = -42;
                if (vfork() == 0) {
                        fd2 = flopen(fn, O_RDWR|O_NONBLOCK);
                        close(fd2);
                        _exit(0);
                }
                if (fd2 == -42)
                        result = "vfork() doesn't work as expected";
                if (fd2 >= 0)
                        result = "second open succeeded";
                close(fd1);
        }
        unlink(fn);
        return (result);
}

/*
 * Test that child processes inherit the lock
 */
const char *
test_flopen_lock_child(void)
{
        const char *fn = "test_flopen_lock_child";
        const char *result = NULL;
        pid_t pid;
        volatile int fd1, fd2;

        unlink(fn);
        fd1 = flopen(fn, O_RDWR|O_CREAT, 0640);
        if (fd1 < 0) {
                result = strerror(errno);
        } else {
                pid = fork();
                if (pid == -1) {
                        result = strerror(errno);
                } else if (pid == 0) {
                        select(0, 0, 0, 0, 0);
                        _exit(0);
                }
                close(fd1);
                if ((fd2 = flopen(fn, O_RDWR|O_NONBLOCK)) != -1) {
                        result = "second open succeeded";
                        close(fd2);
                }
                kill(pid, SIGINT);
        }
        unlink(fn);
        return (result);
}

static struct test {
        const char *name;
        const char *(*func)(void);
} t[] = {
        { "flopen_create", test_flopen_create },
        { "flopen_open", test_flopen_open },
        { "flopen_lock_self", test_flopen_lock_self },
        { "flopen_lock_other", test_flopen_lock_other },
        { "flopen_lock_child", test_flopen_lock_child },
};

int
main(void)
{
        const char *result;
        int i, nt;

        nt = sizeof(t) / sizeof(*t);
        printf("1..%d\n", nt);
        for (i = 0; i < nt; ++i) {
                if ((result = t[i].func()) != NULL)
                        printf("not ok %d - %s # %s\n", i + 1,
                            t[i].name, result);
                else
                        printf("ok %d - %s\n", i + 1,
                            t[i].name);
        }
        exit(0);
}