{
return gl_futimens (-1, file, timespec);
}
+
+/* Set the access and modification time stamps of the symlink FILE to
+ be TIMESPEC[0] and TIMESPEC[1], respectively. Fail with ENOSYS if
+ the platform does not support changing symlink timestamps. */
+int
+lutimens (char const *file _UNUSED_PARAMETER_,
+ struct timespec const timespec[2] _UNUSED_PARAMETER_)
+{
+ /* The Linux kernel did not support symlink timestamps until
+ utimensat, in version 2.6.22, so we don't need to mimic
+ gl_futimens' worry about buggy NFS clients. But we do have to
+ worry about bogus return values. */
+
+#if HAVE_UTIMENSAT
+ {
+ int result = utimensat (AT_FDCWD, file, timespec, AT_SYMLINK_NOFOLLOW);
+# ifdef __linux__
+ /* Work around a kernel bug:
+ http://bugzilla.redhat.com/442352
+ http://bugzilla.redhat.com/449910
+ It appears that utimensat can mistakenly return 280 rather
+ than -1 upon ENOSYS failure.
+ FIXME: remove in 2010 or whenever the offending kernels
+ are no longer in common use. */
+ if (0 < result)
+ errno = ENOSYS;
+# endif
+
+ if (result == 0 || errno != ENOSYS)
+ return result;
+ }
+#endif /* HAVE_UTIMENSAT */
+
+ /* The platform lacks an interface to set file timestamps with
+ nanosecond resolution, so do the best we can, discarding any
+ fractional part of the timestamp. */
+#if HAVE_LUTIMES
+ {
+ struct timeval timeval[2];
+ struct timeval const *t;
+ if (timespec)
+ {
+ timeval[0].tv_sec = timespec[0].tv_sec;
+ timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
+ timeval[1].tv_sec = timespec[1].tv_sec;
+ timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
+ t = timeval;
+ }
+ else
+ t = NULL;
+
+ return lutimes (file, t);
+ }
+#endif /* HAVE_LUTIMES */
+
+ /* Out of luck. Symlink timestamps can't be changed. We won't
+ bother changing the timestamps if FILE was not a symlink. */
+ errno = ENOSYS;
+ return -1;
+}
--- /dev/null
+/* Test of file timestamp modification functions.
+ Copyright (C) 2009 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 2 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/>. */
+
+/* This file assumes that BASE and ASSERT are already defined. */
+
+#ifndef GL_TEST_UTIMENS
+# define GL_TEST_UTIMENS
+
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "stat-time.h"
+#include "timespec.h"
+#include "utimecmp.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)
+};
+
+#endif /* GL_TEST_UTIMENS */
+
+/* This function is designed to test both lutimens(a,b) and
+ utimensat(AT_FDCWD,a,b,AT_SYMLINK_NOFOLLOW). FUNC is the function
+ to test. If PRINT, warn before skipping tests with status 77. */
+static int
+test_lutimens (int (*func) (char const *, struct timespec const *), bool print)
+{
+ int result;
+ struct stat st1;
+ struct stat st2;
+ bool atime_supported = true;
+
+ if (symlink ("nowhere", BASE "link"))
+ {
+ if (print)
+ fputs ("skipping test: symlinks not supported on this file system\n",
+ stderr);
+ return 77;
+ }
+ errno = 0;
+ result = func (BASE "link", NULL);
+ if (result == -1 && errno == ENOSYS)
+ {
+ ASSERT (unlink (BASE "link") == 0);
+ if (print)
+ fputs ("skipping test: "
+ "setting symlink time not supported on this file system\n",
+ stderr);
+ return 77;
+ }
+ ASSERT (!result);
+ ASSERT (lstat (BASE "link", &st1) == 0);
+#if HAVE_USLEEP
+ /* On Cygwin, the mere act of lstat changes symlink atime, even
+ though POSIX says that only readlink is allowed to do that.
+ Sleeping for one millisecond is enough to expose this. Platforms
+ without usleep either don't have symlinks, or are immune. */
+ usleep (1000);
+#endif
+ ASSERT (lstat (BASE "link", &st2) == 0);
+ if (st1.st_atime != st2.st_atime
+ || get_stat_atime_ns (&st1) != get_stat_atime_ns (&st2))
+ atime_supported = false;
+
+ /* Invalid arguments. */
+ errno = 0;
+ ASSERT (func ("no_such", NULL) == -1);
+ ASSERT (errno == ENOENT);
+ errno = 0;
+ ASSERT (func ("", NULL) == -1);
+ ASSERT (errno == ENOENT);
+ {
+ struct timespec ts[2] = { { Y2K, UTIME_BOGUS_POS }, { Y2K, 0 } };
+ errno = 0;
+ ASSERT (func (BASE "link", ts) == -1);
+ ASSERT (errno == EINVAL);
+ }
+ {
+ struct timespec ts[2] = { { Y2K, 0 }, { Y2K, UTIME_BOGUS_NEG } };
+ errno = 0;
+ ASSERT (func (BASE "link", ts) == -1);
+ ASSERT (errno == EINVAL);
+ }
+ ASSERT (lstat (BASE "link", &st2) == 0);
+ if (atime_supported)
+ {
+ ASSERT (st1.st_atime == st2.st_atime);
+ ASSERT (get_stat_atime_ns (&st1) == get_stat_atime_ns (&st2));
+ }
+ ASSERT (utimecmp (BASE "link", &st1, &st2, 0) == 0);
+
+ /* Set both times. */
+ {
+ struct timespec ts[2] = { { Y2K, BILLION / 2 - 1 }, { Y2K, BILLION - 1 } };
+ ASSERT (func (BASE "link", ts) == 0);
+ ASSERT (lstat (BASE "link", &st2) == 0);
+ if (atime_supported)
+ {
+ ASSERT (st2.st_atime == Y2K);
+ ASSERT (0 <= get_stat_atime_ns (&st2));
+ ASSERT (get_stat_atime_ns (&st2) < BILLION / 2);
+ }
+ ASSERT (st2.st_mtime == Y2K);
+ ASSERT (0 <= get_stat_mtime_ns (&st2));
+ ASSERT (get_stat_mtime_ns (&st2) < BILLION);
+ }
+
+ /* Play with UTIME_OMIT, UTIME_NOW. */
+ {
+ struct timespec ts[2] = { { BILLION, UTIME_OMIT }, { 0, UTIME_NOW } };
+ ASSERT (func (BASE "link", ts) == 0);
+ ASSERT (lstat (BASE "link", &st2) == 0);
+ if (atime_supported)
+ {
+ ASSERT (st2.st_atime == Y2K);
+ ASSERT (0 <= get_stat_atime_ns (&st2));
+ ASSERT (get_stat_atime_ns (&st2) < BILLION / 2);
+ }
+ ASSERT (utimecmp (BASE "link", &st1, &st2, 0) <= 0);
+ }
+
+ /* Cleanup. */
+ ASSERT (unlink (BASE "link") == 0);
+ return 0;
+}
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