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/* Check if filesystem timestamps are consistent with the system time.
Copyright (C) 2016 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, 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/>.
*/
#include <config.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stat-time.h>
#include <timespec.h>
#define TEMPLATE "ckmtime.XXXXXX"
#define BILLION 1000000000
/* Some filesystems can slightly offset the timestamps of newly created files.
To compensate for it, tar testsuite waits at least 1 second before creating
next level of incremental backups.
However, NFS mounts can offset the timestamps by bigger amounts.
This program returns with success (0) if a newly created file is assigned
mtime matching the system time to the nearest second.
*/
int
main (int argc, char **argv)
{
int fd;
char name[sizeof(TEMPLATE)];
struct stat st;
struct timespec ts, td;
double diff;
gettime (&ts);
strcpy (name, TEMPLATE);
umask (077);
fd = mkstemp (name);
assert (fd != -1);
unlink (name);
assert (fstat (fd, &st) == 0);
close (fd);
td = timespec_sub (get_stat_mtime (&st), ts);
diff = td.tv_sec * BILLION + td.tv_nsec;
if (diff < 0)
diff = - diff;
if (diff / BILLION >= 1)
{
fprintf (stderr, "file timestamp unreliable\n");
return 1;
}
return 0;
}
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