+++ /dev/null
-/* Set file access and modification times.
-
- 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 3 of the License, or 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/>. */
-
-/* Written by Paul Eggert. */
-
-/* derived from a function in touch.c */
-
-#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
-
-/* Some systems (even some that do have <utime.h>) don't declare this
- structure anywhere. */
-#ifndef HAVE_STRUCT_UTIMBUF
-struct utimbuf
-{
- long actime;
- long modtime;
-};
-#endif
-
-/* 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
-# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
-#endif
-
-/* Set the access and modification time stamps of FD (a.k.a. FILE) to be
- 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 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
-gl_futimens (int fd ATTRIBUTE_UNUSED,
- char const *file, struct timespec const timespec[2])
-{
- /* 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
- 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)
- {
- 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
-
- 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
- if (result == 0 || errno != ENOSYS)
- return result;
- }
-#endif
-
- /* 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;
- }
-
-#if HAVE_WORKING_UTIMES
- return utimes (file, t);
-#else
- {
- 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;
-
- return utime (file, ut);
- }
-#endif /* !HAVE_WORKING_UTIMES */
- }
-}
-
-/* Set the access and modification time stamps of FILE to be
- TIMESPEC[0] and TIMESPEC[1], respectively. */
-int
-utimens (char const *file, struct timespec const timespec[2])
-{
- return gl_futimens (-1, file, timespec);
-}
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