-#ifndef TEST_CHOWN_NAP
-/* Sleep long enough to notice a timestamp difference on the file
- system in the current directory. */
-static void
-nap (void)
-{
-# if !HAVE_USLEEP
- /* Assume the worst case file system of FAT, which has a granularity
- of 2 seconds. */
- sleep (2);
-# else /* HAVE_USLEEP */
- static long delay;
- if (!delay)
- {
- /* Initialize only once, by sleeping for 20 milliseconds (needed
- since xfs has a quantization of about 10 milliseconds, even
- though it has a granularity of 1 nanosecond, and since NTFS
- has a default quantization of 15.25 milliseconds, even though
- it has a granularity of 100 nanoseconds). If the seconds
- differ, repeat the test one more time (in case we crossed a
- quantization boundary on a file system with 1 second
- resolution). If we can't observe a difference in only the
- nanoseconds, then fall back to 2 seconds. However, note that
- usleep (2000000) is allowed to fail with EINVAL. */
- struct stat st1;
- struct stat st2;
- ASSERT (close (creat (BASE "tmp", 0600)) == 0);
- ASSERT (stat (BASE "tmp", &st1) == 0);
- ASSERT (unlink (BASE "tmp") == 0);
- delay = 20000;
- usleep (delay);
- ASSERT (close (creat (BASE "tmp", 0600)) == 0);
- ASSERT (stat (BASE "tmp", &st2) == 0);
- ASSERT (unlink (BASE "tmp") == 0);
- if (st1.st_mtime != st2.st_mtime)
- {
- /* Seconds differ, give it one more shot. */
- st1 = st2;
- usleep (delay);
- ASSERT (close (creat (BASE "tmp", 0600)) == 0);
- ASSERT (stat (BASE "tmp", &st2) == 0);
- ASSERT (unlink (BASE "tmp") == 0);
- }
- if (! (st1.st_mtime == st2.st_mtime
- && get_stat_mtime_ns (&st1) < get_stat_mtime_ns (&st2)))
- delay = 2000000;
- }
- if (delay == 2000000)
- sleep (2);
- else
- usleep (delay);
-# endif /* HAVE_USLEEP */
-}
-#endif /* !TEST_CHOWN_NAP */