c6acfe86c7
conflicts due to radically different approaches to security and bug fixes. In some cases I re-started from the vendor version and reimplemented our patches. Fortunately, this is not enabled by default in -current.
190 lines
5.2 KiB
C
190 lines
5.2 KiB
C
/* Set file access and modification times.
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Copyright (C) 2003, 2004, 2005, 2006, 2007 Free Software
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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 2, or (at your option) any
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later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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/* Written by Paul Eggert. */
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/* derived from a function in touch.c */
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#include <config.h>
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#include "utimens.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/time.h>
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#include <unistd.h>
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#if HAVE_UTIME_H
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# include <utime.h>
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#endif
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/* Some systems (even some that do have <utime.h>) don't declare this
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structure anywhere. */
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#ifndef HAVE_STRUCT_UTIMBUF
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struct utimbuf
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{
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long actime;
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long modtime;
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};
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#endif
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/* Some systems don't have ENOSYS. */
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#ifndef ENOSYS
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# ifdef ENOTSUP
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# define ENOSYS ENOTSUP
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# else
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/* Some systems don't have ENOTSUP either. */
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# define ENOSYS EINVAL
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# endif
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#endif
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#ifndef __attribute__
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# if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
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# define __attribute__(x)
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# endif
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#endif
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#ifndef ATTRIBUTE_UNUSED
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# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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#endif
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/* Set the access and modification time stamps of FD (a.k.a. FILE) to be
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TIMESPEC[0] and TIMESPEC[1], respectively.
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FD must be either negative -- in which case it is ignored --
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or a file descriptor that is open on FILE.
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If FD is nonnegative, then FILE can be NULL, which means
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use just futimes (or equivalent) instead of utimes (or equivalent),
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and fail if on an old system without futimes (or equivalent).
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If TIMESPEC is null, set the time stamps to the current time.
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Return 0 on success, -1 (setting errno) on failure. */
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int
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gl_futimens (int fd ATTRIBUTE_UNUSED,
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char const *file, struct timespec const timespec[2])
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{
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/* Some Linux-based NFS clients are buggy, and mishandle time stamps
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of files in NFS file systems in some cases. We have no
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configure-time test for this, but please see
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<http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to
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some of the problems with Linux 2.6.16. If this affects you,
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compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to
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help in some cases, albeit at a cost in performance. But you
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really should upgrade your kernel to a fixed version, since the
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problem affects many applications. */
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#if HAVE_BUGGY_NFS_TIME_STAMPS
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if (fd < 0)
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sync ();
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else
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fsync (fd);
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#endif
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/* There's currently no interface to set file timestamps with
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nanosecond resolution, so do the best we can, discarding any
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fractional part of the timestamp. */
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#if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
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struct timeval timeval[2];
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struct timeval const *t;
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if (timespec)
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{
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timeval[0].tv_sec = timespec[0].tv_sec;
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timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
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timeval[1].tv_sec = timespec[1].tv_sec;
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timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
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t = timeval;
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}
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else
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t = NULL;
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if (fd < 0)
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{
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# if HAVE_FUTIMESAT
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return futimesat (AT_FDCWD, file, t);
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# endif
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}
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else
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{
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/* If futimesat or futimes fails here, don't try to speed things
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up by returning right away. glibc can incorrectly fail with
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errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
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in high security mode doesn't allow ordinary users to read
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/proc/self, so glibc incorrectly fails with errno == EACCES.
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If errno == EIO, EPERM, or EROFS, it's probably safe to fail
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right away, but these cases are rare enough that they're not
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worth optimizing, and who knows what other messed-up systems
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are out there? So play it safe and fall back on the code
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below. */
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# if HAVE_FUTIMESAT
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if (futimesat (fd, NULL, t) == 0)
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return 0;
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# elif HAVE_FUTIMES
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if (futimes (fd, t) == 0)
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return 0;
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# endif
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}
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#endif
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if (!file)
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{
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#if ! (HAVE_FUTIMESAT || (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
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errno = ENOSYS;
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#endif
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/* Prefer EBADF to ENOSYS if both error numbers apply. */
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if (errno == ENOSYS)
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{
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int fd2 = dup (fd);
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int dup_errno = errno;
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if (0 <= fd2)
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close (fd2);
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errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
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}
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return -1;
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}
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#if HAVE_WORKING_UTIMES
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return utimes (file, t);
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#else
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{
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struct utimbuf utimbuf;
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struct utimbuf const *ut;
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if (timespec)
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{
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utimbuf.actime = timespec[0].tv_sec;
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utimbuf.modtime = timespec[1].tv_sec;
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ut = &utimbuf;
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}
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else
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ut = NULL;
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return utime (file, ut);
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}
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#endif
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}
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/* Set the access and modification time stamps of FILE to be
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TIMESPEC[0] and TIMESPEC[1], respectively. */
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int
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utimens (char const *file, struct timespec const timespec[2])
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{
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return gl_futimens (-1, file, timespec);
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}
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