-/* 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 15 milliseconds (needed
- since xfs has a quantization of about 10 milliseconds, even
- though it has a granularity of 1 nanosecond). 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. */
- struct stat st1;
- struct stat st2;
- ASSERT (stat ("t-stt-stamp1", &st1) == 0);
- ASSERT (unlink ("t-stt-stamp1") == 0);
- delay = 15000;
- usleep (delay);
- create_file ("t-stt-stamp1");
- ASSERT (stat ("t-stt-stamp1", &st2) == 0);
- if (st1.st_mtime != st2.st_mtime)
- {
- /* Seconds differ, give it one more shot. */
- st1 = st2;
- ASSERT (unlink ("t-stt-stamp1") == 0);
- usleep (delay);
- create_file ("t-stt-stamp1");
- ASSERT (stat ("t-stt-stamp1", &st2) == 0);
- }
- if (! (st1.st_mtime == st2.st_mtime
- && get_stat_mtime_ns (&st1) < get_stat_mtime_ns (&st2)))
- delay = 2000000;
- }
- usleep (delay);
-#endif /* HAVE_USLEEP */
-}
-