tools/locktest/testlk.c

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