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

annotate lib/utimens.c @ 12467:912bdb1c31fb

utimens: work around Linux ctime bug Force a ctime update by using stat() before any utimensat call with mtime of UTIME_OMIT. But avoid extra stat()s in later calls, by doing extra work on the first instance in order to cache whether the bug is actually present. * lib/utimens.c (detect_ctime_bug): New helper function. (update_timespec): Differentiate between workaround needed for this bug vs. what is needed for systems that lack utimensat. (fdutimens, lutimens): Work around bug. Signed-off-by: Eric Blake <ebb9@byu.net>

author	Eric Blake <ebb9@byu.net>
date	Thu, 17 Dec 2009 16:57:37 -0700
parents	b79168ca6a08
children	b5e42ef33b49

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
11941 909daff94315 errno: use consistently Eric Blake <ebb9@byu.net> parents: 10186 diff changeset	3 Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Free
909daff94315 errno: use consistently Eric Blake <ebb9@byu.net> parents: 10186 diff changeset	4 Software Foundation, Inc.
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	5
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 8842 diff changeset	6 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	7 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	8 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	9 later version.
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	10
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	11 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	12 but WITHOUT ANY WARRANTY; without even the implied warranty of
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	14 GNU General Public License for more details.
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	15
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	16 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	17 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	18
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	19 /* Written by Paul Eggert. */
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	20
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	21 /* derived from a function in touch.c */
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	22
7302 8a1a9361108c * _fpending.c: Include <config.h> unconditionally, since we no Paul Eggert <eggert@cs.ucla.edu> parents: 6819 diff changeset	23 #include <config.h>
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	24
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	25 #include "utimens.h"
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	26
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	27 #include <assert.h>
5589 6ddb405e16b6 (futimens): Account for the fact that futimes Paul Eggert <eggert@cs.ucla.edu> parents: 5485 diff changeset	28 #include <errno.h>
6283 b377d8796118 * lib/utimens.c (futimens): Use futimesat if available. Paul Eggert <eggert@cs.ucla.edu> parents: 5848 diff changeset	29 #include <fcntl.h>
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	30 #include <stdbool.h>
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	31 #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	32 #include <sys/time.h>
6322 716071856296 Sync from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: 6297 diff changeset	33 #include <unistd.h>
5589 6ddb405e16b6 (futimens): Account for the fact that futimes Paul Eggert <eggert@cs.ucla.edu> parents: 5485 diff changeset	34
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	35 #include "stat-time.h"
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	36 #include "timespec.h"
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	37
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	38 #if HAVE_UTIME_H
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	39 # include <utime.h>
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	40 #endif
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	41
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	42 /* 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	43 structure anywhere. */
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	44 #ifndef HAVE_STRUCT_UTIMBUF
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	45 struct utimbuf
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	46 {
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	47 long actime;
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	48 long modtime;
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	49 };
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	50 #endif
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	51
12174 73f2681e0524 utimensat: new module Eric Blake <ebb9@byu.net> parents: 12173 diff changeset	52 /* Avoid recursion with rpl_futimens or rpl_utimensat. */
12162 fe82ecf4f214 futimens: new module Eric Blake <ebb9@byu.net> parents: 12161 diff changeset	53 #undef futimens
12174 73f2681e0524 utimensat: new module Eric Blake <ebb9@byu.net> parents: 12173 diff changeset	54 #undef utimensat
12162 fe82ecf4f214 futimens: new module Eric Blake <ebb9@byu.net> parents: 12161 diff changeset	55
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	56 /* 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	57 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	58 #ifndef REPLACE_FUNC_STAT_FILE
16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	59 # define REPLACE_FUNC_STAT_FILE 0
16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	60 #endif
16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	61
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	62 #if HAVE_UTIMENSAT \|\| HAVE_FUTIMENS
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	63 /* 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	64 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	65 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	66 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	67 between the following scenarios on Linux:
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	68 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	69 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	70 kernel 2.6.25 and earlier reject UTIME_NOW/UTIME_OMIT with non-zero tv_sec
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	71 kernel 2.6.32 and earlier fail to bump ctime if mtime is UTIME_OMIT
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	72 utimensat completely works
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	73 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	74 static int utimensat_works_really;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	75 static int lutimensat_works_really;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	76 static int utimensat_ctime_really;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	77
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	78 /* Determine whether the kernel has a ctime bug. ST1 and ST2
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	79 correspond to stat data before and after a successful time change.
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	80 TIMES contains the timestamps that were used during the time change
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	81 (mtime will be UTIME_OMIT). Update the cache variable if there is
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	82 conclusive evidence of the kernel working or being buggy. Return
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	83 true if TIMES has been updated and another kernel call is needed,
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	84 whether or not the kernel is known to have the bug. */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	85 static bool
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	86 detect_ctime_bug (struct stat st1, struct stat st2, struct timespec times[2])
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	87 {
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	88 struct timespec now;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	89 if (st1->st_ctime != st2->st_ctime
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	90 \|\| get_stat_ctime_ns (st1) != get_stat_ctime_ns (st2))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	91 {
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	92 utimensat_ctime_really = 1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	93 return false;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	94 }
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	95 /* The results are inconclusive if the ctime in st1 is within a file
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	96 system quantization window of now. For FAT, this is 2 seconds,
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	97 for systems with sub-second resolution, a typical resolution is
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	98 10 milliseconds; to be safe we declare an inconsistent result if
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	99 ctime is within a 20 millisecond window. Avoid an extra gettime
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	100 call if atime makes sense. It is unlikely that the original
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	101 ctime is later than now, but rather than deal with the overflow,
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	102 we treat that as consistent evidence of the bug. */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	103 if (times[0].tv_nsec == UTIME_NOW)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	104 now = get_stat_atime (st2);
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	105 else
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	106 gettime (&now);
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	107 if (now.tv_sec < st2->st_ctime
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	108 \|\| 2 < now.tv_sec - st2->st_ctime
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	109 \|\| (get_stat_ctime_ns (st2)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	110 && now.tv_sec - st2->st_ctime < 2
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	111 && (20000000 < (1000000000 * (now.tv_sec - st2->st_ctime)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	112 + now.tv_nsec - get_stat_ctime_ns (st2)))))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	113 utimensat_ctime_really = -1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	114 times[1] = get_stat_mtime (st2);
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	115 return true;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	116 }
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	117 #endif /* HAVE_UTIMENSAT \|\| HAVE_FUTIMENS */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	118
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	119 /* 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	120 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	121 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	122 timespec needs further adjustment based on stat results: 1 if any
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	123 adjustment is needed for utimes, and 2 if mtime was UTIME_OMIT and
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	124 an adjustment is needed for utimensat. Return -1, with errno set
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	125 to EINVAL, if timespec is out of range. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	126 static int
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	127 validate_timespec (struct timespec timespec[2])
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	128 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	129 int result = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	130 assert (timespec);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	131 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	132 && timespec[0].tv_nsec != UTIME_OMIT
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	133 && (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	134 \|\| (timespec[1].tv_nsec != UTIME_NOW
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	135 && timespec[1].tv_nsec != UTIME_OMIT
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	136 && (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	137 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	138 errno = EINVAL;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	139 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	140 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	141 /* 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	142 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	143 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	144 fails to bump ctime. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	145 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 \|\| timespec[0].tv_nsec == UTIME_OMIT)
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 timespec[0].tv_sec = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	149 result = 1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	150 }
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	151 if (timespec[1].tv_nsec == UTIME_NOW)
12160 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 timespec[1].tv_sec = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	154 result = 1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	155 }
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	156 else if (timespec[1].tv_nsec == UTIME_OMIT)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	157 {
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	158 timespec[1].tv_sec = 0;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	159 result = 2;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	160 }
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	161 return result;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	162 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	163
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	164 /* 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	165 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	166 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	167 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	168 (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	169 necessary); otherwise return false. */
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	170 static bool
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	171 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	172 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	173 struct timespec timespec = ts;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	174 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	175 && timespec[1].tv_nsec == UTIME_OMIT)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	176 return true;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	177 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	178 && timespec[1].tv_nsec == UTIME_NOW)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	179 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	180 *ts = NULL;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	181 return false;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	182 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	183
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	184 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	185 timespec[0] = get_stat_atime (statbuf);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	186 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	187 gettime (&timespec[0]);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	188
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	189 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	190 timespec[1] = get_stat_mtime (statbuf);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	191 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	192 gettime (&timespec[1]);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	193
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	194 return false;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	195 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	196
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	197 /* 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	198 TIMESPEC[0] and TIMESPEC[1], respectively.
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	199 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	200 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	201 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	202 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	203 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	204 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	205 Return 0 on success, -1 (setting errno) on failure. */
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	206
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	207 int
12161 c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	208 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	209 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	210 struct timespec adjusted_timespec[2];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	211 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	212 int adjustment_needed = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	213
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	214 if (ts)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	215 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	216 adjusted_timespec[0] = timespec[0];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	217 adjusted_timespec[1] = timespec[1];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	218 adjustment_needed = validate_timespec (ts);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	219 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	220 if (adjustment_needed < 0)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	221 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	222
12157 7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	223 /* 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	224 a Linux bug where futimens (AT_FDCWD, NULL) changes "." rather
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	225 than failing. */
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	226 if (!file)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	227 {
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	228 if (fd < 0)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	229 {
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	230 errno = EBADF;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	231 return -1;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	232 }
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	233 if (dup2 (fd, fd) != fd)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	234 return -1;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	235 }
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	236
7712 aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	237 /* 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	238 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	239 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	240 <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	241 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	242 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	243 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	244 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	245 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	246
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	247 #if HAVE_BUGGY_NFS_TIME_STAMPS
7713 064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	248 if (fd < 0)
064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	249 sync ();
064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	250 else
7712 aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	251 fsync (fd);
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	252 #endif
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	253
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	254 /* 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	255 nanosecond resolution; newer Linux implements both functions via
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	256 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	257 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	258 running on Linux 2.6.18 kernel). */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	259 #if HAVE_UTIMENSAT \|\| HAVE_FUTIMENS
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	260 if (0 <= utimensat_works_really)
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	261 {
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	262 int result;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	263 struct stat st1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	264 struct stat st2;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	265 /* Linux kernel 2.6.32 has a bug where it fails to bump ctime if
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	266 UTIME_OMIT was used for mtime. It costs time to do an extra
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	267 [f]stat up front, so we cache whether the function works. */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	268 if (utimensat_ctime_really <= 0 && adjustment_needed == 2)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	269 {
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	270 if (fd < 0 ? stat (file, &st1) : fstat (fd, &st1))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	271 return -1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	272 if (ts[0].tv_nsec == UTIME_OMIT)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	273 return 0;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	274 if (utimensat_ctime_really < 0)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	275 ts[1] = get_stat_mtime (&st1);
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	276 }
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	277 # if HAVE_UTIMENSAT
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	278 if (fd < 0)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	279 {
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	280 result = utimensat (AT_FDCWD, file, ts, 0);
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	281 # ifdef __linux__
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	282 /* Work around a kernel bug:
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	283 http://bugzilla.redhat.com/442352
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	284 http://bugzilla.redhat.com/449910
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	285 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	286 than -1 upon ENOSYS failure.
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	287 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	288 are no longer in common use. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	289 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	290 errno = ENOSYS;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	291 # endif /* __linux__ */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	292 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	293 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	294 utimensat_works_really = 1;
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	295 if (result == 0 && utimensat_ctime_really == 0
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	296 && adjustment_needed == 2)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	297 {
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	298 /* Perform a followup stat to see if the kernel has
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	299 a ctime bug. */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	300 if (stat (file, &st2))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	301 return -1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	302 if (detect_ctime_bug (&st1, &st2, ts))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	303 result = utimensat (AT_FDCWD, file, ts, 0);
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	304 }
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	305 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	306 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	307 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	308 # endif /* HAVE_UTIMENSAT */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	309 # if HAVE_FUTIMENS
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	310 {
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	311 result = futimens (fd, ts);
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	312 # ifdef __linux__
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	313 /* Work around the same bug as above. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	314 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	315 errno = ENOSYS;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	316 # endif /* __linux__ */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	317 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	318 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	319 utimensat_works_really = 1;
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	320 /* Work around the same bug as above. */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	321 if (result == 0 && utimensat_ctime_really == 0
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	322 && adjustment_needed == 2)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	323 {
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	324 if (fstat (fd, &st2))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	325 return -1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	326 if (detect_ctime_bug (&st1, &st2, ts))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	327 result = futimens (fd, ts);
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	328 }
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	329 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	330 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	331 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	332 # endif /* HAVE_FUTIMENS */
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	333 }
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	334 utimensat_works_really = -1;
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	335 lutimensat_works_really = -1;
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	336 #endif /* HAVE_UTIMENSAT \|\| HAVE_FUTIMENS */
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	337
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	338 /* The platform lacks an interface to set file timestamps with
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	339 nanosecond resolution, so do the best we can, discarding any
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	340 fractional part of the timestamp. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	341
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	342 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	343 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	344 struct stat st;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	345 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	346 return -1;
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	347 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	348 return 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	349 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	350
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	351 {
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	352 #if HAVE_FUTIMESAT \|\| HAVE_WORKING_UTIMES
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	353 struct timeval timeval[2];
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	354 struct timeval const *t;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	355 if (ts)
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	356 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	357 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	358 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	359 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	360 timeval[1].tv_usec = ts[1].tv_nsec / 1000;
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	361 t = timeval;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	362 }
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	363 else
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	364 t = NULL;
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	365
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	366 if (fd < 0)
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	367 {
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	368 # if HAVE_FUTIMESAT
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	369 return futimesat (AT_FDCWD, file, t);
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	370 # endif
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	371 }
10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	372 else
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	373 {
12317 407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	374 /* 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	375 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	376 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	377 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	378 /proc/self, so glibc incorrectly fails with errno == EACCES.
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	379 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	380 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	381 worth optimizing, and who knows what other messed-up systems
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	382 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	383 below. */
12317 407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	384 # if HAVE_FUTIMESAT && !FUTIMESAT_NULL_BUG
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	385 if (futimesat (fd, NULL, t) == 0)
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	386 return 0;
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	387 # elif HAVE_FUTIMES
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	388 if (futimes (fd, t) == 0)
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	389 return 0;
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	390 # endif
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	391 }
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	392 #endif /* HAVE_FUTIMESAT \|\| HAVE_WORKING_UTIMES */
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	393
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	394 if (!file)
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	395 {
12317 407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	396 #if ! ((HAVE_FUTIMESAT && !FUTIMESAT_NULL_BUG) \
407921985bc0 utimens: fix regression on Solaris Eric Blake <ebb9@byu.net> parents: 12256 diff changeset	397 \|\| (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	398 errno = ENOSYS;
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	399 #endif
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	400 return -1;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	401 }
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	402
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	403 #if HAVE_WORKING_UTIMES
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	404 return utimes (file, t);
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	405 #else
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	406 {
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	407 struct utimbuf utimbuf;
12157 7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	408 struct utimbuf *ut;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	409 if (ts)
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	410 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	411 utimbuf.actime = ts[0].tv_sec;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	412 utimbuf.modtime = ts[1].tv_sec;
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	413 ut = &utimbuf;
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	414 }
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	415 else
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	416 ut = NULL;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	417
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	418 return utime (file, ut);
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	419 }
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	420 #endif /* !HAVE_WORKING_UTIMES */
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	421 }
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	422 }
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	423
12161 c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	424 /* 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	425 TIMESPEC[0] and TIMESPEC[1], respectively.
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	426 FD must be either negative -- in which case it is ignored --
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	427 or a file descriptor that is open on FILE.
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	428 If FD is nonnegative, then FILE can be NULL, which means
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	429 use just futimes (or equivalent) instead of utimes (or equivalent),
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	430 and fail if on an old system without futimes (or equivalent).
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	431 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	432 Return 0 on success, -1 (setting errno) on failure. */
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	433
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	434 int
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	435 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	436 {
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	437 return fdutimens (file, fd, timespec);
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	438 }
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	439
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	440 /* 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	441 TIMESPEC[0] and TIMESPEC[1], respectively. */
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	442 int
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	443 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	444 {
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	445 return fdutimens (file, -1, timespec);
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	446 }
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	447
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	448 /* 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	449 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	450 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	451 changing symlink timestamps, but FILE was a symlink. */
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	452 int
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	453 lutimens (char const *file, struct timespec const timespec[2])
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	454 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	455 struct timespec adjusted_timespec[2];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	456 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	457 int adjustment_needed = 0;
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	458 struct stat st;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	459
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	460 if (ts)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	461 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	462 adjusted_timespec[0] = timespec[0];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	463 adjusted_timespec[1] = timespec[1];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	464 adjustment_needed = validate_timespec (ts);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	465 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	466 if (adjustment_needed < 0)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	467 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	468
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	469 /* The Linux kernel did not support symlink timestamps until
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	470 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	471 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	472 worry about bogus return values. */
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	473
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	474 #if HAVE_UTIMENSAT
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	475 if (0 <= lutimensat_works_really)
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	476 {
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	477 int result;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	478 struct stat st1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	479 struct stat st2;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	480 /* Linux kernel 2.6.32 has a bug where it fails to bump ctime if
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	481 UTIME_OMIT was used for mtime. It costs time to do an extra
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	482 lstat up front, so we cache whether the function works. */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	483 if (utimensat_ctime_really <= 0 && adjustment_needed == 2)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	484 {
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	485 if (lstat (file, &st1))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	486 return -1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	487 if (ts[0].tv_nsec == UTIME_OMIT)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	488 return 0;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	489 if (utimensat_ctime_really < 0)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	490 ts[1] = get_stat_mtime (&st1);
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	491 }
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	492 result = utimensat (AT_FDCWD, file, ts, AT_SYMLINK_NOFOLLOW);
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	493 # ifdef __linux__
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	494 /* Work around a kernel bug:
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	495 http://bugzilla.redhat.com/442352
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	496 http://bugzilla.redhat.com/449910
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	497 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	498 than -1 upon ENOSYS failure.
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	499 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	500 are no longer in common use. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	501 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	502 errno = ENOSYS;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	503 # endif
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	504 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	505 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	506 utimensat_works_really = 1;
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	507 lutimensat_works_really = 1;
12467 912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	508 if (result == 0 && utimensat_ctime_really == 0
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	509 && adjustment_needed == 2)
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	510 {
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	511 /* Perform a followup stat to see if the kernel has a
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	512 ctime bug. */
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	513 if (lstat (file, &st2))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	514 return -1;
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	515 if (detect_ctime_bug (&st1, &st2, ts))
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	516 result = utimensat (AT_FDCWD, file, ts, AT_SYMLINK_NOFOLLOW);
912bdb1c31fb utimens: work around Linux ctime bug Eric Blake <ebb9@byu.net> parents: 12447 diff changeset	517 }
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	518 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	519 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	520 }
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	521 lutimensat_works_really = -1;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	522 #endif /* HAVE_UTIMENSAT */
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	523
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	524 /* The platform lacks an interface to set file timestamps with
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	525 nanosecond resolution, so do the best we can, discarding any
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	526 fractional part of the timestamp. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	527
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	528 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	529 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	530 if (lstat (file, &st))
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	531 return -1;
12194 16c7c4fa9754 utimensat: work around Solaris 9 bug Eric Blake <ebb9@byu.net> parents: 12174 diff changeset	532 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	533 return 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	534 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	535
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	536 /* 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	537 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	538 #if HAVE_LUTIMES && !HAVE_UTIMENSAT
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	539 {
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	540 struct timeval timeval[2];
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	541 struct timeval const *t;
12447 b79168ca6a08 utimens: one more try at avoiding compiler warning Eric Blake <ebb9@byu.net> parents: 12377 diff changeset	542 int result;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	543 if (ts)
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	544 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	545 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	546 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	547 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	548 timeval[1].tv_usec = ts[1].tv_nsec / 1000;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	549 t = timeval;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	550 }
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	551 else
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	552 t = NULL;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	553
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	554 result = lutimes (file, t);
fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	555 if (result == 0 \|\| errno != ENOSYS)
fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	556 return result;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	557 }
12353 fd066c132b7d utimens: work around older Linux failure with symlinks Eric Blake <ebb9@byu.net> parents: 12317 diff changeset	558 #endif /* HAVE_LUTIMES && !HAVE_UTIMENSAT */
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	559
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	560 /* 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	561 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	562 return -1;
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	563 if (!S_ISLNK (st.st_mode))
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	564 return fdutimens (file, -1, ts);
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	565 errno = ENOSYS;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	566 return -1;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	567 }

Mercurial > hg > octave-shane > gnulib-hg

annotate lib/utimens.c @ 12467:912bdb1c31fb