/*
 * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
 * 
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 * 
 * 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.
 * 3. Neither the name of The DragonFly Project nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific, prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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.
 * 
 * $DragonFly: src/test/debug/posixlock.c,v 1.1 2006/05/08 00:30:41 dillon Exp $
 */

#include <sys/types.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>

static void prompt(void);

int
main(int ac, char **av)
{
    struct flock lk;
    off_t save_start;
    off_t save_len;
    char c;
    int r;
    int fd;
    char buf[256];

    if ((fd = open("test", O_CREAT|O_RDWR, 0666)) < 0) {
        perror("open");
        exit(1);
    }
    prompt();
    while (fgets(buf, sizeof(buf), stdin) != NULL) {
        bzero(&lk, sizeof(lk));
        c = '#';
        sscanf(buf, "%c %ld %ld", &c, &lk.l_start, &lk.l_len);

        save_start = lk.l_start;
        save_len = lk.l_len;

        switch(c) {
        case 'l':
            lk.l_type = F_WRLCK;
            while ((r = fcntl(fd, F_GETLK, &lk)) == 0) {
                printf("%5d %c %jd %jd\n",
                        (int)lk.l_pid,
                        ((lk.l_type == F_WRLCK) ? 'x' :
                         (lk.l_type == F_RDLCK) ? 'r' :
                         (lk.l_type == F_UNLCK) ? 'u' : '?'),
                        lk.l_start,
                        lk.l_len
                );
                if (lk.l_len == 0)
                        break;
                lk.l_start += lk.l_len;
                if (save_len)
                        lk.l_len = save_len - (lk.l_start - save_start);
                else
                        lk.l_len = 0;
                lk.l_type = F_WRLCK;
            }
            if (r < 0)
                printf("%s\n", strerror(errno));
            break;
        case 's':
            lk.l_type = F_RDLCK;
            if (fcntl(fd, F_SETLKW, &lk) == 0) {
                printf("ok\n");
            } else {
                printf("%s\n", strerror(errno));
            }
            break;
        case 'x':
            lk.l_type = F_WRLCK;
            if (fcntl(fd, F_SETLKW, &lk) == 0) {
                printf("ok\n");
            } else {
                printf("%s\n", strerror(errno));
            }
            break;
        case 'u':
            lk.l_type = F_UNLCK;
            if (fcntl(fd, F_SETLKW, &lk) == 0) {
                printf("ok\n");
            } else {
                printf("%s\n", strerror(errno));
            }
            break;
        case '?':
                printf(
                        "l start len\tlist locks\n"
                        "s start len\tobtain a read lock\n"
                        "x start len\tobtain an exclusive lock\n"
                        "u start len\tounlock a range\n"
                );
                break;
        case '\n':
        case '\0':
        case '#':
                break;
        default:
                printf("unknown command '%c'\n", c);
                break;
        }
        prompt();
    }
    return(0);
}

static
void
prompt(void)
{
    printf("locker> ");
    fflush(stdout);
}