719d3b44b7
UPDATE_COPYRIGHT_USE_INTERVALS=1 \
gnulib/build-aux/update-copyright \
$(git ls-files | sed -e '/^gnulib$/d
/^paxutils$/d
/^COPYING$/d
/\/fdl.texi$/d')
70 lines
2.0 KiB
C
70 lines
2.0 KiB
C
/* Check if filesystem timestamps are consistent with the system time.
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Copyright (C) 2016-2023 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <string.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stat-time.h>
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#include <timespec.h>
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#define TEMPLATE "ckmtime.XXXXXX"
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#define BILLION 1000000000
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/* Some filesystems can slightly offset the timestamps of newly created files.
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To compensate for it, tar testsuite waits at least 1 second before creating
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next level of incremental backups.
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However, NFS mounts can offset the timestamps by bigger amounts.
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This program returns with success (0) if a newly created file is assigned
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mtime matching the system time to the nearest second.
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*/
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int
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main (int argc, char **argv)
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{
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int fd;
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char name[sizeof(TEMPLATE)];
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struct stat st;
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struct timespec ts, td;
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double diff;
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gettime (&ts);
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strcpy (name, TEMPLATE);
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umask (077);
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fd = mkstemp (name);
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assert (fd != -1);
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unlink (name);
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assert (fstat (fd, &st) == 0);
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close (fd);
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td = timespec_sub (get_stat_mtime (&st), ts);
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diff = td.tv_sec * BILLION + td.tv_nsec;
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if (diff < 0)
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diff = - diff;
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if (diff / BILLION >= 1)
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{
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fprintf (stderr, "file timestamp unreliable\n");
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return 1;
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}
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return 0;
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}
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