lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
- lock.l_start = 0;
+ lock.l_start = 0x100000000LL;
lock.l_len = 4;
lock.l_pid = getpid();
lock.l_type = F_WRLCK;
lock.l_whence = SEEK_SET;
lock.l_start = 0;
- lock.l_len = 4;
+ lock.l_len = 0x100000004LL;
lock.l_pid = getpid();
- /* set a 4 byte write lock */
- fcntl(fd,F_SETLK,&lock);
+ /* set a 100000004 byte write lock, should conflict with the above */
+ ret = fcntl(fd,F_SETLK,&lock);
sys_waitpid(pid, &status, 0);
unlink(DATA);
+ if (ret != 0) {
+ fprintf(stderr,"ERROR: failed to lock %s (errno=%d)\n",
+ DATA, (int)errno);
+ exit(1);
+ }
+
+ if (lock.l_len < 0x100000004LL) {
+ fprintf(stderr,"ERROR: settign lock overflowed\n");
+ exit(1);
+ }
+
#if defined(WIFEXITED) && defined(WEXITSTATUS)
if(WIFEXITED(status)) {
status = WEXITSTATUS(status);