source4/build/tests/fcntl_lock64.c

   1 /* test whether 64 bit fcntl locking really works on this system */
   2
   3 #if defined(HAVE_UNISTD_H)
   4 #include <unistd.h>
   5 #endif
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <sys/types.h>
  10
  11 #ifdef HAVE_FCNTL_H
  12 #include <fcntl.h>
  13 #endif
  14
  15 #ifdef HAVE_SYS_FCNTL_H
  16 #include <sys/fcntl.h>
  17 #endif
  18
  19 #include <errno.h>
  20
  21 #define DATA "conftest.fcntl64"
  22
  23 /* lock a byte range in a open file */
  24 int main(int argc, char *argv[])
  25 {
  26         struct flock64 lock;
  27         int fd, ret, status=1;
  28         pid_t pid;
  29
  30         if (!(pid=fork())) {
  31                 sleep(2);
  32                 fd = open64(DATA, O_RDONLY);
  33
  34                 if (fd == -1) exit(1);
  35
  36                 lock.l_type = F_WRLCK;
  37                 lock.l_whence = SEEK_SET;
  38                 lock.l_start = 0;
  39                 lock.l_len = 4;
  40                 lock.l_pid = getpid();
  41
  42                 lock.l_type = F_WRLCK;
  43
  44                 /* check if a lock applies */
  45                 ret = fcntl(fd,F_GETLK64,&lock);
  46
  47                 if ((ret == -1) ||
  48                     (lock.l_type == F_UNLCK)) {
  49 /*            printf("No lock conflict\n"); */
  50                         exit(1);
  51                 } else {
  52 /*            printf("lock conflict\n"); */
  53                         exit(0);
  54                 }
  55         }
  56
  57         fd = open64(DATA, O_RDWR|O_CREAT|O_TRUNC, 0600);
  58
  59         lock.l_type = F_WRLCK;
  60         lock.l_whence = SEEK_SET;
  61 #if defined(COMPILER_SUPPORTS_LL)
  62         lock.l_start = 0x100000000LL;
  63 #else
  64         lock.l_start = 0x100000000;
  65 #endif
  66         lock.l_len = 4;
  67         lock.l_pid = getpid();
  68
  69         /* set a 4 byte write lock */
  70         fcntl(fd,F_SETLK64,&lock);
  71
  72         sys_waitpid(pid, &status, 0);
  73
  74 #if defined(WIFEXITED) && defined(WEXITSTATUS)
  75         if(WIFEXITED(status)) {
  76                 status = WEXITSTATUS(status);
  77         } else {
  78                 status = 1;
  79         }
  80 #else /* defined(WIFEXITED) && defined(WEXITSTATUS) */
  81         status = (status == 0) ? 0 : 1;
  82 #endif /* defined(WIFEXITED) && defined(WEXITSTATUS) */
  83
  84         unlink(DATA);
  85
  86         exit(status);
  87 }