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Diffstat (limited to 'gnulib/tests/nap.h')
m--------- | gnulib | 0 | ||||
-rw-r--r-- | gnulib/tests/nap.h | 67 |
2 files changed, 67 insertions, 0 deletions
diff --git a/gnulib b/gnulib deleted file mode 160000 -Subproject 443bc5ffcf7429e557f4a371b0661abe98ddbc1 diff --git a/gnulib/tests/nap.h b/gnulib/tests/nap.h new file mode 100644 index 0000000..40c1744 --- /dev/null +++ b/gnulib/tests/nap.h @@ -0,0 +1,67 @@ +/* Assist in file system timestamp tests. + Copyright (C) 2009-2011 Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +/* Written by Eric Blake <ebb9@byu.net>, 2009. */ + +#ifndef GLTEST_NAP_H +# define GLTEST_NAP_H + +/* Sleep long enough to notice a timestamp difference on the file + system in the current directory. Assumes that BASE is defined, + and requires that the test module depends on usleep. */ +static void +nap (void) +{ + 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 1 second if the time is odd, + and 2 seconds (needed for FAT) if time is even. */ + 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 = (st1.st_mtime & 1) ? 1000000 : 2000000; + } + usleep (delay); +} + +#endif /* GLTEST_NAP_H */ |