tools/locktest/testlk.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4
   5 #include <stdlib.h>
   6 #include <stdio.h>
   7 #include <unistd.h>
   8 #ifdef linux
   9 #include <getopt.h>
  10 #endif
  11 #include <fcntl.h>
  12
  13 static void     usage(int exval);
  14 static void     fatal(char *);
  15
  16 int
  17 main(int argc, char **argv)
  18 {
  19         unsigned long   start = 0, len = 0;
  20         struct flock    fl;
  21         int             c, fd, cmd, typ;
  22         char            *fname;
  23
  24         typ = F_RDLCK;
  25         cmd = F_SETLK;
  26
  27         while ((c = getopt(argc, argv, "bhrtw")) != EOF) {
  28                 switch (c) {
  29                 case 'h':
  30                         usage(0);
  31                 case 'r':
  32                         cmd = F_SETLK;
  33                         typ = F_RDLCK;
  34                         break;
  35                 case 'w':
  36                         cmd = F_SETLK;
  37                         typ = F_WRLCK;
  38                         break;
  39                 case 'b':
  40                         cmd = F_SETLKW;
  41                         typ = F_WRLCK;
  42                         break;
  43                 case 't':
  44                         cmd = F_GETLK;
  45                         break;
  46                 case '?':
  47                         usage(1);
  48                 }
  49         }
  50
  51         argc -= optind;
  52         argv += optind;
  53
  54         if (argc <= 0 || argc > 3)
  55                 usage(1);
  56
  57         fname = argv[0];
  58         /* printf("TP\n"); */
  59         if (argc > 1)
  60                 start = atoi(argv[1]);
  61         /* printf("TP\n"); */
  62         if (argc > 2)
  63                 len   = atoi(argv[2]);
  64         /* printf("TP\n"); */
  65
  66         if ((fd = open(fname, O_RDWR, 0644)) < 0)
  67                 fatal(fname);
  68
  69         /* printf("TP1\n"); */
  70         fl.l_type = typ;
  71         fl.l_whence = 0;
  72         fl.l_start = start;
  73         fl.l_len = len;
  74
  75         if (fcntl(fd, cmd, &fl) < 0)
  76                 fatal("fcntl");
  77         printf("fcntl: ok\n");
  78
  79         /* printf("TP2\n"); */
  80         if (cmd == F_GETLK) {
  81                 if (fl.l_type == F_UNLCK) {
  82                         printf("%s: no conflicting lock\n", fname);
  83                 } else {
  84                         printf("%s: conflicting lock by %d on (%lld;%lld)\n",
  85                                 fname, fl.l_pid, fl.l_start, fl.l_len);
  86                 }
  87                 return 0;
  88         }
  89
  90         /* printf("TP3\n"); */
  91         pause();
  92         return 0;
  93 }
  94
  95 static void
  96 usage(int exval)
  97 {
  98         fprintf(stderr, "usage: testlk filename [start [len]]\n");
  99         exit(exval);
 100 }
 101
 102 static void
 103 fatal(char *msg)
 104 {
 105         perror(msg);
 106         exit(2);
 107 }