octave-shane/gnulib-hg: lib/utimens.c annotate

annotate lib/utimens.c @ 12525:53f80a530574

futimens, utimensat: work around ntfs-3g bug With ntfs-3g, use of a single UTIME_OMIT failed to make any change to the remaining two timestamps. Furthermore, the previous fix for ctime happens to be specific to xfs, rather than global to the kernel. Therefore, to be valid, a cache would have to be per-device, which gets too expensive, especially considering that the cost of a preparatory stat pulls the file into kernel cache to speed up the resulting utimensat. So, blindly massage UTIME_OMIT on Linux, even on working filesystems like ext4. The bugs in xfs and ntfs-3g were reported to the kernel folks, and fixes written, but it will be several years before gnulib can assume that file systems in use have picked up the fixes. * lib/utimensat.c (rpl_utimensat): Drop attempts to cache whether a ctime bug is present, and expand workaround to cover ntfs-3g. * lib/utimens.c (fdutimens, lutimens): Likewise. (utimensat_ctime_really, detect_ctime_bug): Drop cache mechanism. (validate_timespec): Adjust return value. * m4/futimens.m4 (gl_FUNC_FUTIMENS): Update comment. * m4/utimensat.m4 (gl_FUNC_UTIMENSAT): Likewise. Reported by ctrn3e8 <ctrn3e8@gmail.com>. Signed-off-by: Eric Blake <ebb9@byu.net>

author	Eric Blake <ebb9@byu.net>
date	Wed, 30 Dec 2009 06:48:46 -0700
parents	b5e42ef33b49
children	0774f328f2ff

rev	line source
6734 3e5ad4566013 * utimens.c (futimens): glibc futimesat messes up if /proc Paul Eggert <eggert@cs.ucla.edu> parents: 6440 diff changeset	1 /* Set file access and modification times.
3e5ad4566013 * utimens.c (futimens): glibc futimesat messes up if /proc Paul Eggert <eggert@cs.ucla.edu> parents: 6440 diff changeset	2
12518 b5e42ef33b49 update nearly all FSF copyright year lists to include 2009 Jim Meyering <meyering@redhat.com> parents: 12467 diff changeset	3 Copyright (C) 2003-2009 Free Software Foundation, Inc.
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	4
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 8842 diff changeset	5 This program is free software: you can redistribute it and/or modify it
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	6 under the terms of the GNU General Public License as published by the
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 8842 diff changeset	7 Free Software Foundation; either version 3 of the License, or any
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	8 later version.
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	9
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	10 This program is distributed in the hope that it will be useful,
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	13 GNU General Public License for more details.
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	14
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	15 You should have received a copy of the GNU General Public License
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 8842 diff changeset	16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	17
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	18 /* Written by Paul Eggert. */
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	19
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	20 /* derived from a function in touch.c */
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	21
7302 8a1a9361108c * _fpending.c: Include <config.h> unconditionally, since we no Paul Eggert <eggert@cs.ucla.edu> parents: 6819 diff changeset	22 #include <config.h>
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	23
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	24 #include "utimens.h"
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	25
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	26 #include <assert.h>
5589 6ddb405e16b6 (futimens): Account for the fact that futimes Paul Eggert <eggert@cs.ucla.edu> parents: 5485 diff changeset	27 #include <errno.h>
6283 b377d8796118 * lib/utimens.c (futimens): Use futimesat if available. Paul Eggert <eggert@cs.ucla.edu> parents: 5848 diff changeset	28 #include <fcntl.h>
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	29 #include <stdbool.h>
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	30 #include <sys/stat.h>
7897 b7a83a69ac23 * MODULES.html.sh (Support for systems lacking POSIX:2001): New Paul Eggert <eggert@cs.ucla.edu> parents: 7713 diff changeset	31 #include <sys/time.h>
6322 716071856296 Sync from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: 6297 diff changeset	32 #include <unistd.h>
5589 6ddb405e16b6 (futimens): Account for the fact that futimes Paul Eggert <eggert@cs.ucla.edu> parents: 5485 diff changeset	33
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	34 #include "stat-time.h"
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	35 #include "timespec.h"
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	36
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	37 #if HAVE_UTIME_H
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	38 # include <utime.h>
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	39 #endif
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	40
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	41 /* Some systems (even some that do have <utime.h>) don't declare this
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	42 structure anywhere. */
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	43 #ifndef HAVE_STRUCT_UTIMBUF
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	44 struct utimbuf
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	45 {
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	46 long actime;
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	47 long modtime;
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	48 };
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	49 #endif
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	50
12174 73f2681e0524 utimensat: new module Eric Blake <ebb9@byu.net> parents: 12173 diff changeset	51 /* Avoid recursion with rpl_futimens or rpl_utimensat. */
12162 fe82ecf4f214 futimens: new module Eric Blake <ebb9@byu.net> parents: 12161 diff changeset	52 #undef futimens
12174 73f2681e0524 utimensat: new module Eric Blake <ebb9@byu.net> parents: 12173 diff changeset	53 #undef utimensat
12162 fe82ecf4f214 futimens: new module Eric Blake <ebb9@byu.net> parents: 12161 diff changeset	54
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	55 /* Solaris 9 mistakenly succeeds when given a non-directory with a
16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	56 trailing slash. Force the use of rpl_stat for a fix. */
16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	57 #ifndef REPLACE_FUNC_STAT_FILE
16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	58 # define REPLACE_FUNC_STAT_FILE 0
16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	59 #endif
16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	60
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	61 #if HAVE_UTIMENSAT \|\| HAVE_FUTIMENS
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	62 /* Cache variables for whether the utimensat syscall works; used to
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	63 avoid calling the syscall if we know it will just fail with ENOSYS,
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	64 and to avoid unnecessary work in massaging timestamps if the
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	65 syscall will work. Multiple variables are needed, to distinguish
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	66 between the following scenarios on Linux:
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	67 utimensat doesn't exist, or is in glibc but kernel 2.6.18 fails with ENOSYS
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	68 kernel 2.6.22 and earlier rejects AT_SYMLINK_NOFOLLOW
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	69 kernel 2.6.25 and earlier reject UTIME_NOW/UTIME_OMIT with non-zero tv_sec
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	70 kernel 2.6.32 used with xfs or ntfs-3g fail to honor UTIME_OMIT
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	71 utimensat completely works
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	72 For each cache variable: 0 = unknown, 1 = yes, -1 = no. */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	73 static int utimensat_works_really;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	74 static int lutimensat_works_really;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	75 #endif /* HAVE_UTIMENSAT \|\| HAVE_FUTIMENS */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	76
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	77 /* Validate the requested timestamps. Return 0 if the resulting
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	78 timespec can be used for utimensat (after possibly modifying it to
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	79 work around bugs in utimensat). Return a positive value if the
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	80 timespec needs further adjustment based on stat results: 1 if any
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	81 adjustment is needed for utimes, and 2 if any adjustment is needed
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	82 for Linux utimensat. Return -1, with errno set to EINVAL, if
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	83 timespec is out of range. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	84 static int
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	85 validate_timespec (struct timespec timespec[2])
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	86 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	87 int result = 0;
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	88 int utime_omit_count = 0;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	89 assert (timespec);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	90 if ((timespec[0].tv_nsec != UTIME_NOW
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	91 && timespec[0].tv_nsec != UTIME_OMIT
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	92 && (timespec[0].tv_nsec < 0 \|\| 1000000000 <= timespec[0].tv_nsec))
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	93 \|\| (timespec[1].tv_nsec != UTIME_NOW
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	94 && timespec[1].tv_nsec != UTIME_OMIT
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	95 && (timespec[1].tv_nsec < 0 \|\| 1000000000 <= timespec[1].tv_nsec)))
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	96 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	97 errno = EINVAL;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	98 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	99 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	100 /* Work around Linux kernel 2.6.25 bug, where utimensat fails with
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	101 EINVAL if tv_sec is not 0 when using the flag values of tv_nsec.
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	102 Flag a Linux kernel 2.6.32 bug, where an mtime of UTIME_OMIT
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	103 fails to bump ctime. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	104 if (timespec[0].tv_nsec == UTIME_NOW
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	105 \|\| timespec[0].tv_nsec == UTIME_OMIT)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	106 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	107 timespec[0].tv_sec = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	108 result = 1;
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	109 if (timespec[0].tv_nsec == UTIME_OMIT)
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	110 utime_omit_count++;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	111 }
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	112 if (timespec[1].tv_nsec == UTIME_NOW
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	113 \|\| timespec[1].tv_nsec == UTIME_OMIT)
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	114 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	115 timespec[1].tv_sec = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	116 result = 1;
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	117 if (timespec[1].tv_nsec == UTIME_OMIT)
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	118 utime_omit_count++;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	119 }
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	120 return result + (utime_omit_count == 1);
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	121 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	122
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	123 /* Normalize any UTIME_NOW or UTIME_OMIT values in *TS, using stat
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	124 buffer STATBUF to obtain the current timestamps of the file. If
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	125 both times are UTIME_NOW, set *TS to NULL (as this can avoid some
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	126 permissions issues). If both times are UTIME_OMIT, return true
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	127 (nothing further beyond the prior collection of STATBUF is
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	128 necessary); otherwise return false. */
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	129 static bool
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	130 update_timespec (struct stat const statbuf, struct timespec ts[2])
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	131 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	132 struct timespec timespec = ts;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	133 if (timespec[0].tv_nsec == UTIME_OMIT
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	134 && timespec[1].tv_nsec == UTIME_OMIT)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	135 return true;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	136 if (timespec[0].tv_nsec == UTIME_NOW
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	137 && timespec[1].tv_nsec == UTIME_NOW)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	138 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	139 *ts = NULL;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	140 return false;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	141 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	142
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	143 if (timespec[0].tv_nsec == UTIME_OMIT)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	144 timespec[0] = get_stat_atime (statbuf);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	145 else if (timespec[0].tv_nsec == UTIME_NOW)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	146 gettime (&timespec[0]);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	147
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	148 if (timespec[1].tv_nsec == UTIME_OMIT)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	149 timespec[1] = get_stat_mtime (statbuf);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	150 else if (timespec[1].tv_nsec == UTIME_NOW)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	151 gettime (&timespec[1]);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	152
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	153 return false;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	154 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	155
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	156 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	157 TIMESPEC[0] and TIMESPEC[1], respectively.
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	158 FD must be either negative -- in which case it is ignored --
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	159 or a file descriptor that is open on FILE.
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	160 If FD is nonnegative, then FILE can be NULL, which means
10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	161 use just futimes (or equivalent) instead of utimes (or equivalent),
10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	162 and fail if on an old system without futimes (or equivalent).
10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	163 If TIMESPEC is null, set the time stamps to the current time.
10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	164 Return 0 on success, -1 (setting errno) on failure. */
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	165
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	166 int
12161 c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	167 fdutimens (char const *file, int fd, struct timespec const timespec[2])
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	168 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	169 struct timespec adjusted_timespec[2];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	170 struct timespec *ts = timespec ? adjusted_timespec : NULL;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	171 int adjustment_needed = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	172
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	173 if (ts)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	174 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	175 adjusted_timespec[0] = timespec[0];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	176 adjusted_timespec[1] = timespec[1];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	177 adjustment_needed = validate_timespec (ts);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	178 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	179 if (adjustment_needed < 0)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	180 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	181
12157 7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	182 /* Require that at least one of FD or FILE are valid. Works around
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	183 a Linux bug where futimens (AT_FDCWD, NULL) changes "." rather
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	184 than failing. */
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	185 if (!file)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	186 {
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	187 if (fd < 0)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	188 {
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	189 errno = EBADF;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	190 return -1;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	191 }
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	192 if (dup2 (fd, fd) != fd)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	193 return -1;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	194 }
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	195
7712 aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	196 /* Some Linux-based NFS clients are buggy, and mishandle time stamps
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	197 of files in NFS file systems in some cases. We have no
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	198 configure-time test for this, but please see
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	199 <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	200 some of the problems with Linux 2.6.16. If this affects you,
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	201 compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	202 help in some cases, albeit at a cost in performance. But you
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	203 really should upgrade your kernel to a fixed version, since the
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	204 problem affects many applications. */
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	205
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	206 #if HAVE_BUGGY_NFS_TIME_STAMPS
7713 064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	207 if (fd < 0)
064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	208 sync ();
064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	209 else
7712 aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	210 fsync (fd);
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	211 #endif
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	212
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	213 /* POSIX 2008 added two interfaces to set file timestamps with
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	214 nanosecond resolution; newer Linux implements both functions via
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	215 a single syscall. We provide a fallback for ENOSYS (for example,
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	216 compiling against Linux 2.6.25 kernel headers and glibc 2.7, but
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	217 running on Linux 2.6.18 kernel). */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	218 #if HAVE_UTIMENSAT \|\| HAVE_FUTIMENS
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	219 if (0 <= utimensat_works_really)
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	220 {
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	221 int result;
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	222 # if __linux__
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	223 struct stat st;
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	224 /* As recently as Linux kernel 2.6.32 (Dec 2009), several file
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	225 systems (xfs, ntfs-3g) have bugs with a single UTIME_OMIT,
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	226 but work if both times are either explicitly specified or
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	227 UTIME_NOW. Work around it with a preparatory [f]stat prior
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	228 to calling futimens/utimensat; fortunately, there is not much
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	229 timing impact due to the extra syscall even on file systems
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	230 where UTIME_OMIT would have worked. FIXME: Simplify this in
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	231 2012, when file system bugs are no longer common. */
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	232 if (adjustment_needed == 2)
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	233 {
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	234 if (fd < 0 ? stat (file, &st) : fstat (fd, &st))
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	235 return -1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	236 if (ts[0].tv_nsec == UTIME_OMIT)
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	237 ts[0] = get_stat_atime (&st);
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	238 else if (ts[1].tv_nsec == UTIME_OMIT)
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	239 ts[1] = get_stat_mtime (&st);
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	240 }
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	241 # endif /* __linux__ */
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	242 # if HAVE_UTIMENSAT
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	243 if (fd < 0)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	244 {
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	245 result = utimensat (AT_FDCWD, file, ts, 0);
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	246 # ifdef __linux__
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	247 /* Work around a kernel bug:
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	248 http://bugzilla.redhat.com/442352
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	249 http://bugzilla.redhat.com/449910
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	250 It appears that utimensat can mistakenly return 280 rather
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	251 than -1 upon ENOSYS failure.
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	252 FIXME: remove in 2010 or whenever the offending kernels
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	253 are no longer in common use. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	254 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	255 errno = ENOSYS;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	256 # endif /* __linux__ */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	257 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	258 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	259 utimensat_works_really = 1;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	260 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	261 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	262 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	263 # endif /* HAVE_UTIMENSAT */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	264 # if HAVE_FUTIMENS
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	265 {
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	266 result = futimens (fd, ts);
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	267 # ifdef __linux__
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	268 /* Work around the same bug as above. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	269 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	270 errno = ENOSYS;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	271 # endif /* __linux__ */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	272 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	273 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	274 utimensat_works_really = 1;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	275 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	276 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	277 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	278 # endif /* HAVE_FUTIMENS */
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	279 }
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	280 utimensat_works_really = -1;
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	281 lutimensat_works_really = -1;
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	282 #endif /* HAVE_UTIMENSAT \|\| HAVE_FUTIMENS */
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	283
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	284 /* The platform lacks an interface to set file timestamps with
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	285 nanosecond resolution, so do the best we can, discarding any
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	286 fractional part of the timestamp. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	287
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	288 if (adjustment_needed \|\| (REPLACE_FUNC_STAT_FILE && fd < 0))
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	289 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	290 struct stat st;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	291 if (fd < 0 ? stat (file, &st) : fstat (fd, &st))
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	292 return -1;
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	293 if (ts && update_timespec (&st, &ts))
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	294 return 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	295 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	296
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	297 {
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	298 #if HAVE_FUTIMESAT \|\| HAVE_WORKING_UTIMES
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	299 struct timeval timeval[2];
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	300 struct timeval const *t;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	301 if (ts)
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	302 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	303 timeval[0].tv_sec = ts[0].tv_sec;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	304 timeval[0].tv_usec = ts[0].tv_nsec / 1000;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	305 timeval[1].tv_sec = ts[1].tv_sec;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	306 timeval[1].tv_usec = ts[1].tv_nsec / 1000;
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	307 t = timeval;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	308 }
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	309 else
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	310 t = NULL;
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	311
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	312 if (fd < 0)
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	313 {
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	314 # if HAVE_FUTIMESAT
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	315 return futimesat (AT_FDCWD, file, t);
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	316 # endif
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	317 }
10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	318 else
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	319 {
12317 407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	320 /* If futimesat or futimes fails here, don't try to speed things
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	321 up by returning right away. glibc can incorrectly fail with
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	322 errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	323 in high security mode doesn't allow ordinary users to read
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	324 /proc/self, so glibc incorrectly fails with errno == EACCES.
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	325 If errno == EIO, EPERM, or EROFS, it's probably safe to fail
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	326 right away, but these cases are rare enough that they're not
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	327 worth optimizing, and who knows what other messed-up systems
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	328 are out there? So play it safe and fall back on the code
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	329 below. */
12317 407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	330 # if HAVE_FUTIMESAT && !FUTIMESAT_NULL_BUG
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	331 if (futimesat (fd, NULL, t) == 0)
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	332 return 0;
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	333 # elif HAVE_FUTIMES
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	334 if (futimes (fd, t) == 0)
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	335 return 0;
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	336 # endif
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	337 }
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	338 #endif /* HAVE_FUTIMESAT \|\| HAVE_WORKING_UTIMES */
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	339
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	340 if (!file)
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	341 {
12317 407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	342 #if ! ((HAVE_FUTIMESAT && !FUTIMESAT_NULL_BUG) \
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	343 \|\| (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	344 errno = ENOSYS;
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	345 #endif
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	346 return -1;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	347 }
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	348
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	349 #if HAVE_WORKING_UTIMES
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	350 return utimes (file, t);
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	351 #else
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	352 {
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	353 struct utimbuf utimbuf;
12157 7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	354 struct utimbuf *ut;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	355 if (ts)
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	356 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	357 utimbuf.actime = ts[0].tv_sec;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	358 utimbuf.modtime = ts[1].tv_sec;
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	359 ut = &utimbuf;
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	360 }
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	361 else
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	362 ut = NULL;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	363
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	364 return utime (file, ut);
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	365 }
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	366 #endif /* !HAVE_WORKING_UTIMES */
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	367 }
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	368 }
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	369
12161 c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	370 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	371 TIMESPEC[0] and TIMESPEC[1], respectively.
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	372 FD must be either negative -- in which case it is ignored --
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	373 or a file descriptor that is open on FILE.
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	374 If FD is nonnegative, then FILE can be NULL, which means
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	375 use just futimes (or equivalent) instead of utimes (or equivalent),
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	376 and fail if on an old system without futimes (or equivalent).
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	377 If TIMESPEC is null, set the time stamps to the current time.
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	378 Return 0 on success, -1 (setting errno) on failure. */
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	379
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	380 int
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	381 gl_futimens (int fd, char const *file, struct timespec const timespec[2])
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	382 {
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	383 return fdutimens (file, fd, timespec);
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	384 }
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	385
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	386 /* Set the access and modification time stamps of FILE to be
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	387 TIMESPEC[0] and TIMESPEC[1], respectively. */
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	388 int
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	389 utimens (char const *file, struct timespec const timespec[2])
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	390 {
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	391 return fdutimens (file, -1, timespec);
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	392 }
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	393
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	394 /* Set the access and modification time stamps of FILE to be
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	395 TIMESPEC[0] and TIMESPEC[1], respectively, without dereferencing
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	396 symlinks. Fail with ENOSYS if the platform does not support
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	397 changing symlink timestamps, but FILE was a symlink. */
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	398 int
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	399 lutimens (char const *file, struct timespec const timespec[2])
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	400 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	401 struct timespec adjusted_timespec[2];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	402 struct timespec *ts = timespec ? adjusted_timespec : NULL;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	403 int adjustment_needed = 0;
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	404 struct stat st;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	405
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	406 if (ts)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	407 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	408 adjusted_timespec[0] = timespec[0];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	409 adjusted_timespec[1] = timespec[1];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	410 adjustment_needed = validate_timespec (ts);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	411 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	412 if (adjustment_needed < 0)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	413 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	414
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	415 /* The Linux kernel did not support symlink timestamps until
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	416 utimensat, in version 2.6.22, so we don't need to mimic
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	417 gl_futimens' worry about buggy NFS clients. But we do have to
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	418 worry about bogus return values. */
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	419
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	420 #if HAVE_UTIMENSAT
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	421 if (0 <= lutimensat_works_really)
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	422 {
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	423 int result;
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	424 # if __linux__
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	425 struct stat st;
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	426 /* As recently as Linux kernel 2.6.32 (Dec 2009), several file
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	427 systems (xfs, ntfs-3g) have bugs with a single UTIME_OMIT,
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	428 but work if both times are either explicitly specified or
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	429 UTIME_NOW. Work around it with a preparatory lstat prior to
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	430 calling utimensat; fortunately, there is not much timing
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	431 impact due to the extra syscall even on file systems where
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	432 UTIME_OMIT would have worked. FIXME: Simplify this in 2012,
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	433 when file system bugs are no longer common. */
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	434 if (adjustment_needed == 2)
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	435 {
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	436 if (lstat (file, &st))
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	437 return -1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	438 if (ts[0].tv_nsec == UTIME_OMIT)
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	439 ts[0] = get_stat_atime (&st);
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	440 else if (ts[1].tv_nsec == UTIME_OMIT)
53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	441 ts[1] = get_stat_mtime (&st);
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	442 }
12525 53f80a530574 futimens, utimensat: work around ntfs-3g bug Eric Blake <ebb9@byu.net> parents: 12518 diff changeset	443 # endif /* __linux__ */
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	444 result = utimensat (AT_FDCWD, file, ts, AT_SYMLINK_NOFOLLOW);
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	445 # ifdef __linux__
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	446 /* Work around a kernel bug:
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	447 http://bugzilla.redhat.com/442352
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	448 http://bugzilla.redhat.com/449910
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	449 It appears that utimensat can mistakenly return 280 rather
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	450 than -1 upon ENOSYS failure.
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	451 FIXME: remove in 2010 or whenever the offending kernels
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	452 are no longer in common use. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	453 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	454 errno = ENOSYS;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	455 # endif
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	456 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	457 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	458 utimensat_works_really = 1;
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	459 lutimensat_works_really = 1;
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	460 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	461 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	462 }
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	463 lutimensat_works_really = -1;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	464 #endif /* HAVE_UTIMENSAT */
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	465
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	466 /* The platform lacks an interface to set file timestamps with
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	467 nanosecond resolution, so do the best we can, discarding any
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	468 fractional part of the timestamp. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	469
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	470 if (adjustment_needed \|\| REPLACE_FUNC_STAT_FILE)
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	471 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	472 if (lstat (file, &st))
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	473 return -1;
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	474 if (ts && update_timespec (&st, &ts))
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	475 return 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	476 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	477
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	478 /* On Linux, lutimes is a thin wrapper around utimensat, so there is
fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	479 no point trying lutimes if utimensat failed with ENOSYS. */
fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	480 #if HAVE_LUTIMES && !HAVE_UTIMENSAT
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	481 {
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	482 struct timeval timeval[2];
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	483 struct timeval const *t;
12447 b79168ca6a08 utimens: one more try at avoiding compiler warning Eric Blake <ebb9@byu.net> parents: 12377 diff changeset	484 int result;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	485 if (ts)
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	486 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	487 timeval[0].tv_sec = ts[0].tv_sec;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	488 timeval[0].tv_usec = ts[0].tv_nsec / 1000;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	489 timeval[1].tv_sec = ts[1].tv_sec;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	490 timeval[1].tv_usec = ts[1].tv_nsec / 1000;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	491 t = timeval;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	492 }
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	493 else
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	494 t = NULL;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	495
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	496 result = lutimes (file, t);
fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	497 if (result == 0 \|\| errno != ENOSYS)
fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	498 return result;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	499 }
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	500 #endif /* HAVE_LUTIMES && !HAVE_UTIMENSAT */
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	501
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	502 /* Out of luck for symlinks, but we still handle regular files. */
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	503 if (!(adjustment_needed \|\| REPLACE_FUNC_STAT_FILE) && lstat (file, &st))
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	504 return -1;
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	505 if (!S_ISLNK (st.st_mode))
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	506 return fdutimens (file, -1, ts);
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	507 errno = ENOSYS;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	508 return -1;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	509 }

Mercurial > hg > octave-shane > gnulib-hg

annotate lib/utimens.c @ 12525:53f80a530574