-/* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
+/* Set file access and modification times.
- This program is free software; you can redistribute it and/or modify it
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008 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, or (at your option) any
+ Free Software Foundation; either version 3 of the License, or any
later version.
This program is distributed in the hope that it will be useful,
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, write to the Free Software Foundation,
- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
/* derived from a function in touch.c */
-#ifdef HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
#include "utimens.h"
#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <unistd.h>
#if HAVE_UTIME_H
# include <utime.h>
};
#endif
-#if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
-# define __attribute__(x)
+/* Some systems don't have ENOSYS. */
+#ifndef ENOSYS
+# ifdef ENOTSUP
+# define ENOSYS ENOTSUP
+# else
+/* Some systems don't have ENOTSUP either. */
+# define ENOSYS EINVAL
+# endif
+#endif
+
+#ifndef __attribute__
+# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8)
+# define __attribute__(x)
+# endif
#endif
#ifndef ATTRIBUTE_UNUSED
TIMESPEC[0] and TIMESPEC[1], respectively.
FD must be either negative -- in which case it is ignored --
or a file descriptor that is open on FILE.
- If TIMESPEC is null, set the time stamps to the current time. */
+ If FD is nonnegative, then FILE can be NULL, which means
+ use just futimes (or equivalent) instead of utimes (or equivalent),
+ and fail if on an old system without futimes (or equivalent).
+ If TIMESPEC is null, set the time stamps to the current time.
+ Return 0 on success, -1 (setting errno) on failure. */
int
-futimens (int fd ATTRIBUTE_UNUSED,
- char const *file, struct timespec const timespec[2])
+gl_futimens (int fd ATTRIBUTE_UNUSED,
+ char const *file, struct timespec const timespec[2])
{
- /* There's currently no interface to set file timestamps with
- nanosecond resolution, so do the best we can, discarding any
- fractional part of the timestamp. */
-#if HAVE_WORKING_UTIMES
- 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;
- }
+ /* Some Linux-based NFS clients are buggy, and mishandle time stamps
+ of files in NFS file systems in some cases. We have no
+ configure-time test for this, but please see
+ <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to
+ some of the problems with Linux 2.6.16. If this affects you,
+ compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to
+ help in some cases, albeit at a cost in performance. But you
+ really should upgrade your kernel to a fixed version, since the
+ problem affects many applications. */
+
+#if HAVE_BUGGY_NFS_TIME_STAMPS
+ if (fd < 0)
+ sync ();
else
- t = NULL;
-# if HAVE_FUTIMES
- if (0 <= fd)
+ fsync (fd);
+#endif
+
+ /* POSIX 200x added two interfaces to set file timestamps with
+ nanosecond resolution. We provide a fallback for ENOSYS (for
+ example, compiling against Linux 2.6.25 kernel headers and glibc
+ 2.7, but running on Linux 2.6.18 kernel). */
+#if HAVE_UTIMENSAT
+ if (fd < 0)
{
- if (futimes (fd, t) == 0)
- return 0;
+ int result = utimensat (AT_FDCWD, file, timespec, 0);
+# ifdef __linux__
+ /* Work around what might be 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 failure.
+ FIXME: remove in 2010 or whenever the offending kernels
+ are no longer in common use. */
+ if (0 < result)
+ errno = ENOSYS;
+# endif
- /* On GNU/Linux without the futimes syscall and without /proc
- mounted, glibc futimes fails with errno == ENOENT. Fall back
- on utimes if we get a weird error number like that. */
- switch (errno)
- {
- case EACCES:
- case EIO:
- case EPERM:
- case EROFS:
- return -1;
- }
+ if (result == 0 || errno != ENOSYS)
+ return result;
}
+#endif
+#if HAVE_FUTIMENS
+ {
+ int result = futimens (fd, timespec);
+# ifdef __linux__
+ /* Work around the same bug as above. */
+ if (0 < result)
+ errno = ENOSYS;
# endif
- return utimes (file, t);
+ if (result == 0 || errno != ENOSYS)
+ return result;
+ }
+#endif
-#else
+ /* 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_FUTIMESAT || HAVE_WORKING_UTIMES
+ 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;
+
+ if (fd < 0)
+ {
+# if HAVE_FUTIMESAT
+ return futimesat (AT_FDCWD, file, t);
+# endif
+ }
+ else
+ {
+ /* If futimesat or futimes fails here, don't try to speed things
+ up by returning right away. glibc can incorrectly fail with
+ errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
+ in high security mode doesn't allow ordinary users to read
+ /proc/self, so glibc incorrectly fails with errno == EACCES.
+ If errno == EIO, EPERM, or EROFS, it's probably safe to fail
+ right away, but these cases are rare enough that they're not
+ worth optimizing, and who knows what other messed-up systems
+ are out there? So play it safe and fall back on the code
+ below. */
+# if HAVE_FUTIMESAT
+ if (futimesat (fd, NULL, t) == 0)
+ return 0;
+# elif HAVE_FUTIMES
+ if (futimes (fd, t) == 0)
+ return 0;
+# endif
+ }
+#endif /* HAVE_FUTIMESAT || HAVE_WORKING_UTIMES */
+
+ if (!file)
+ {
+#if ! (HAVE_FUTIMESAT || (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
+ errno = ENOSYS;
+#endif
+
+ /* Prefer EBADF to ENOSYS if both error numbers apply. */
+ if (errno == ENOSYS)
+ {
+ int fd2 = dup (fd);
+ int dup_errno = errno;
+ if (0 <= fd2)
+ close (fd2);
+ errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
+ }
+
+ return -1;
+ }
- struct utimbuf utimbuf;
- struct utimbuf const *t;
- if (timespec)
+#if HAVE_WORKING_UTIMES
+ return utimes (file, t);
+#else
{
- utimbuf.actime = timespec[0].tv_sec;
- utimbuf.modtime = timespec[1].tv_sec;
- t = &utimbuf;
- }
- else
- t = NULL;
- return utime (file, t);
+ struct utimbuf utimbuf;
+ struct utimbuf const *ut;
+ if (timespec)
+ {
+ utimbuf.actime = timespec[0].tv_sec;
+ utimbuf.modtime = timespec[1].tv_sec;
+ ut = &utimbuf;
+ }
+ else
+ ut = NULL;
-#endif
+ return utime (file, ut);
+ }
+#endif /* !HAVE_WORKING_UTIMES */
+ }
}
/* Set the access and modification time stamps of FILE to be
int
utimens (char const *file, struct timespec const timespec[2])
{
- return futimens (-1, file, timespec);
+ return gl_futimens (-1, file, timespec);
}
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