test/debug/posixlock.c

   1 /*
   2  * Copyright (c) 2006 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Matthew Dillon <dillon@backplane.com>
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in
  15  *    the documentation and/or other materials provided with the
  16  *    distribution.
  17  * 3. Neither the name of The DragonFly Project nor the names of its
  18  *    contributors may be used to endorse or promote products derived
  19  *    from this software without specific, prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  24  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  25  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  26  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  27  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  28  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  29  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  30  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  31  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  *
  34  * $DragonFly: src/test/debug/posixlock.c,v 1.1 2006/05/08 00:30:41 dillon Exp $
  35  */
  36
  37 #include <sys/types.h>
  38 #include <fcntl.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <unistd.h>
  42 #include <string.h>
  43 #include <errno.h>
  44
  45 static void prompt(void);
  46
  47 int
  48 main(int ac, char **av)
  49 {
  50     struct flock lk;
  51     off_t save_start;
  52     off_t save_len;
  53     char c;
  54     int r;
  55     int fd;
  56     char buf[256];
  57
  58     if ((fd = open("test", O_CREAT|O_RDWR, 0666)) < 0) {
  59         perror("open");
  60         exit(1);
  61     }
  62     prompt();
  63     while (fgets(buf, sizeof(buf), stdin) != NULL) {
  64         bzero(&lk, sizeof(lk));
  65         c = '#';
  66         sscanf(buf, "%c %ld %ld", &c, &lk.l_start, &lk.l_len);
  67
  68         save_start = lk.l_start;
  69         save_len = lk.l_len;
  70
  71         switch(c) {
  72         case 'l':
  73             lk.l_type = F_WRLCK;
  74             while ((r = fcntl(fd, F_GETLK, &lk)) == 0) {
  75                 printf("%5d %c %jd %jd\n",
  76                         (int)lk.l_pid,
  77                         ((lk.l_type == F_WRLCK) ? 'x' :
  78                          (lk.l_type == F_RDLCK) ? 'r' :
  79                          (lk.l_type == F_UNLCK) ? 'u' : '?'),
  80                         lk.l_start,
  81                         lk.l_len
  82                 );
  83                 if (lk.l_len == 0)
  84                         break;
  85                 lk.l_start += lk.l_len;
  86                 if (save_len)
  87                         lk.l_len = save_len - (lk.l_start - save_start);
  88                 else
  89                         lk.l_len = 0;
  90                 lk.l_type = F_WRLCK;
  91             }
  92             if (r < 0)
  93                 printf("%s\n", strerror(errno));
  94             break;
  95         case 's':
  96             lk.l_type = F_RDLCK;
  97             if (fcntl(fd, F_SETLKW, &lk) == 0) {
  98                 printf("ok\n");
  99             } else {
 100                 printf("%s\n", strerror(errno));
 101             }
 102             break;
 103         case 'x':
 104             lk.l_type = F_WRLCK;
 105             if (fcntl(fd, F_SETLKW, &lk) == 0) {
 106                 printf("ok\n");
 107             } else {
 108                 printf("%s\n", strerror(errno));
 109             }
 110             break;
 111         case 'u':
 112             lk.l_type = F_UNLCK;
 113             if (fcntl(fd, F_SETLKW, &lk) == 0) {
 114                 printf("ok\n");
 115             } else {
 116                 printf("%s\n", strerror(errno));
 117             }
 118             break;
 119         case '?':
 120                 printf(
 121                         "l start len\tlist locks\n"
 122                         "s start len\tobtain a read lock\n"
 123                         "x start len\tobtain an exclusive lock\n"
 124                         "u start len\tounlock a range\n"
 125                 );
 126                 break;
 127         case '\n':
 128         case '\0':
 129         case '#':
 130                 break;
 131         default:
 132                 printf("unknown command '%c'\n", c);
 133                 break;
 134         }
 135         prompt();
 136     }
 137     return(0);
 138 }
 139
 140 static
 141 void
 142 prompt(void)
 143 {
 144     printf("locker> ");
 145     fflush(stdout);
 146 }