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/* Test of file timestamp modification functions.
Copyright (C) 2009-2025 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 <https://www.gnu.org/licenses/>. */
/* This file defines some prerequisites useful to utime-related tests. */
#ifndef GL_TEST_UTIMENS_COMMON
# define GL_TEST_UTIMENS_COMMON
# include <fcntl.h>
# include <errno.h>
# include <string.h>
# include <sys/stat.h>
# include <unistd.h>
/* Gnulib modules. */
# include "stat-time.h"
# include "timespec.h"
# include "utimecmp.h"
/* Gnulib test header. */
# include "nap.h"
enum {
BILLION = 1000 * 1000 * 1000,
Y2K = 946684800, /* Jan 1, 2000, in seconds since epoch. */
/* Bogus positive and negative tv_nsec values closest to valid
range, but without colliding with UTIME_NOW or UTIME_OMIT. */
UTIME_BOGUS_POS = BILLION + ((UTIME_NOW == BILLION || UTIME_OMIT == BILLION)
? (1 + (UTIME_NOW == BILLION + 1)
+ (UTIME_OMIT == BILLION + 1))
: 0),
UTIME_BOGUS_NEG = -1 - ((UTIME_NOW == -1 || UTIME_OMIT == -1)
? (1 + (UTIME_NOW == -2) + (UTIME_OMIT == -2))
: 0)
};
# if defined _WIN32 && !defined __CYGWIN__
/* Skip ctime tests on native Windows, since it is either a copy of
mtime or birth time (depending on the file system), rather than a
properly tracked change time. See
<https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/stat-functions>. */
# define check_ctime 0
# elif (defined __APPLE__ && defined __MACH__) || defined __NetBSD__
/* On macOS, the ctime is not updated when only the st_atime changes. */
# define check_ctime -1
# else
# define check_ctime 1
# endif
/* Compare two st_ctime values. Return -1, 0 or 1, respectively
when A's st_ctime is smaller than, equal to or greater than B's. */
static int
ctime_compare (struct stat const *a, struct stat const *b)
{
if (a->st_ctime < b->st_ctime)
return -1;
else if (b->st_ctime < a->st_ctime)
return 1;
else if (get_stat_ctime_ns (a) < get_stat_ctime_ns (b))
return -1;
else if (get_stat_ctime_ns (b) < get_stat_ctime_ns (a))
return 1;
else
return 0;
}
/* Test whether FD's file access times are updated by the file system.
FD must be readable. Set *ST to the file's status, after any
change to its access time due to the test. */
static bool
checkable_atime (int fd, struct stat *st)
{
char buf[1];
struct stat st1, st2;
ASSERT (fstat (fd, &st1) == 0);
nap ();
ASSERT (read (fd, buf, sizeof buf) == 0);
ASSERT (fstat (fd, &st2) == 0);
bool check_atime
#if defined __HAIKU__
/* On Haiku, the st_atime field is always the current time. It is as if there
was a daemon running (as root) that constantly reads from all files on all
disks at the same time. See <https://dev.haiku-os.org/ticket/19038>. */
= false;
#else
= (st1.st_atime != st2.st_atime
|| get_stat_atime_ns (&st1) != get_stat_atime_ns (&st2));
#endif
if (st)
*st = st2;
return check_atime;
}
#endif /* GL_TEST_UTIMENS_COMMON */
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