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

annotate lib/utimens.c @ 12173:efdb2ab5743f

utimens: let lutimens work on non-symlinks Coreutils new 'touch -h' is easier to write if we guarantee POSIX semantics of utimensat(fd,"file",NULL,AT_SYMLINK_NOFOLLOW), rather than blindly failing with ENOSYS even on non-symlinks. * lib/utimens.c (lutimens): Fall back to utimens rather than failing with ENOSYS, when file is not a symlink. (utimens): Reduce redirection. * tests/test-lutimens.h (test_lutimens): Update test to cover non-symlinks. * tests/test-utimens.h (test_utimens): Update test to cover symlinks. * tests/test-utimens.c (main): Update caller. Signed-off-by: Eric Blake <ebb9@byu.net>

author	Eric Blake <ebb9@byu.net>
date	Thu, 15 Oct 2009 12:04:57 -0600
parents	52ebfd595434
children	73f2681e0524

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
12162 fe82ecf4f214 futimens: new module Eric Blake <ebb9@byu.net> parents: 12161 diff changeset	52 /* Avoid recursion with rpl_futimens. */
fe82ecf4f214 futimens: new module Eric Blake <ebb9@byu.net> parents: 12161 diff changeset	53 #undef futimens
fe82ecf4f214 futimens: new module Eric Blake <ebb9@byu.net> parents: 12161 diff changeset	54
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	55 #if HAVE_UTIMENSAT \|\| HAVE_FUTIMENS
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	56 /* Cache variable for whether syscall works; used to avoid calling the
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	57 syscall if we know it will just fail with ENOSYS. 0 = unknown, 1 =
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	58 yes, -1 = no. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	59 static int utimensat_works_really;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	60 #endif /* HAVE_UTIMENSAT \|\| HAVE_UTIMENSAT */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	61
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	62 /* 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	63 timespec can be used for utimensat (after possibly modifying it to
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	64 work around bugs in utimensat). Return 1 if the timespec needs
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	65 further adjustment based on stat results for utimes or other less
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	66 powerful interfaces. Return -1, with errno set to EINVAL, if
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	67 timespec is out of range. */
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	68 static int
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	69 validate_timespec (struct timespec timespec[2])
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	70 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	71 int result = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	72 assert (timespec);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	73 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	74 && timespec[0].tv_nsec != UTIME_OMIT
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	75 && (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	76 \|\| (timespec[1].tv_nsec != UTIME_NOW
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	77 && timespec[1].tv_nsec != UTIME_OMIT
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	78 && (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	79 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	80 errno = EINVAL;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	81 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	82 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	83 /* Work around Linux kernel 2.6.25 bug, where utimensat fails with
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	84 EINVAL if tv_sec is not 0 when using the flag values of
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	85 tv_nsec. */
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	86 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	87 \|\| timespec[0].tv_nsec == UTIME_OMIT)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	88 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	89 timespec[0].tv_sec = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	90 result = 1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	91 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	92 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	93 \|\| timespec[1].tv_nsec == UTIME_OMIT)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	94 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	95 timespec[1].tv_sec = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	96 result = 1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	97 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	98 return result;
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
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	101 /* 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	102 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	103 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	104 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	105 (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	106 necessary); otherwise return false. */
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	107 static bool
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	108 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	109 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	110 struct timespec timespec = ts;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	111 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	112 && timespec[1].tv_nsec == UTIME_OMIT)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	113 return true;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	114 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	115 && timespec[1].tv_nsec == UTIME_NOW)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	116 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	117 *ts = NULL;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	118 return false;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	119 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	120
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	121 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	122 timespec[0] = get_stat_atime (statbuf);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	123 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	124 gettime (&timespec[0]);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	125
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	126 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	127 timespec[1] = get_stat_mtime (statbuf);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	128 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	129 gettime (&timespec[1]);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	130
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	131 return false;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	132 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	133
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	134 /* 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	135 TIMESPEC[0] and TIMESPEC[1], respectively.
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	136 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	137 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	138 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	139 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	140 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	141 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	142 Return 0 on success, -1 (setting errno) on failure. */
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	143
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	144 int
12161 c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	145 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	146 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	147 struct timespec adjusted_timespec[2];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	148 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	149 int adjustment_needed = 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	150
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	151 if (ts)
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 adjusted_timespec[0] = timespec[0];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	154 adjusted_timespec[1] = timespec[1];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	155 adjustment_needed = validate_timespec (ts);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	156 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	157 if (adjustment_needed < 0)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	158 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	159
12157 7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	160 /* 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	161 a Linux bug where futimens (AT_FDCWD, NULL) changes "." rather
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	162 than failing. */
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	163 if (!file)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	164 {
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	165 if (fd < 0)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	166 {
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	167 errno = EBADF;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	168 return -1;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	169 }
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	170 if (dup2 (fd, fd) != fd)
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	171 return -1;
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	172 }
7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	173
7712 aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	174 /* 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	175 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	176 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	177 <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	178 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	179 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	180 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	181 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	182 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	183
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	184 #if HAVE_BUGGY_NFS_TIME_STAMPS
7713 064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	185 if (fd < 0)
064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	186 sync ();
064005e1c3c3 Prefer fd < 0 to ! (0 <= fd). Paul Eggert <eggert@cs.ucla.edu> parents: 7712 diff changeset	187 else
7712 aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	188 fsync (fd);
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	189 #endif
aead3397193a * lib/utimens.c (futimens) [HAVE_BUGGY_NFS_TIME_STAMPS]: Add a Paul Eggert <eggert@cs.ucla.edu> parents: 7302 diff changeset	190
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	191 /* 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	192 nanosecond resolution; newer Linux implements both functions via
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	193 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	194 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	195 running on Linux 2.6.18 kernel). */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	196 #if HAVE_UTIMENSAT \|\| HAVE_FUTIMENS
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	197 if (0 <= utimensat_works_really)
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	198 {
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	199 # if HAVE_UTIMENSAT
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	200 if (fd < 0)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	201 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	202 int result = utimensat (AT_FDCWD, file, ts, 0);
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	203 # ifdef __linux__
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	204 /* Work around a kernel bug:
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	205 http://bugzilla.redhat.com/442352
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	206 http://bugzilla.redhat.com/449910
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	207 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	208 than -1 upon ENOSYS failure.
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	209 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	210 are no longer in common use. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	211 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	212 errno = ENOSYS;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	213 # endif /* __linux__ */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	214 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	215 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	216 utimensat_works_really = 1;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	217 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	218 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	219 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	220 # endif /* HAVE_UTIMENSAT */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	221 # if HAVE_FUTIMENS
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	222 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	223 int result = futimens (fd, timespec);
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	224 # ifdef __linux__
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	225 /* Work around the same bug as above. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	226 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	227 errno = ENOSYS;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	228 # endif /* __linux__ */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	229 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	230 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	231 utimensat_works_really = 1;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	232 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	233 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	234 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	235 # endif /* HAVE_FUTIMENS */
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	236 }
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	237 utimensat_works_really = -1;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	238 #endif /* HAVE_UTIMENSAT \|\| HAVE_FUTIMENS */
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	239
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	240 /* The platform lacks an interface to set file timestamps with
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	241 nanosecond resolution, so do the best we can, discarding any
3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	242 fractional part of the timestamp. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	243
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	244 if (adjustment_needed)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	245 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	246 struct stat st;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	247 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	248 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	249 if (update_timespec (&st, &ts))
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	250 return 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	251 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	252
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	253 {
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	254 #if HAVE_FUTIMESAT \|\| HAVE_WORKING_UTIMES
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	255 struct timeval timeval[2];
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	256 struct timeval const *t;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	257 if (ts)
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	258 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	259 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	260 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	261 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	262 timeval[1].tv_usec = ts[1].tv_nsec / 1000;
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	263 t = timeval;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	264 }
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	265 else
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	266 t = NULL;
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	267
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	268 if (fd < 0)
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	269 {
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	270 # if HAVE_FUTIMESAT
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	271 return futimesat (AT_FDCWD, file, t);
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	272 # endif
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	273 }
10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	274 else
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	275 {
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	276 /* If futimesat or futimes fails here, don't try to speed things
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	277 up by returning right away. glibc can incorrectly fail with
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	278 errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	279 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	280 /proc/self, so glibc incorrectly fails with errno == EACCES.
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	281 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	282 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	283 worth optimizing, and who knows what other messed-up systems
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	284 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	285 below. */
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	286 # if HAVE_FUTIMESAT
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	287 if (futimesat (fd, NULL, t) == 0)
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	288 return 0;
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	289 # elif HAVE_FUTIMES
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	290 if (futimes (fd, t) == 0)
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	291 return 0;
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	292 # endif
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	293 }
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	294 #endif /* HAVE_FUTIMESAT \|\| HAVE_WORKING_UTIMES */
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	295
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	296 if (!file)
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 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 && HAVE_FUTIMES))
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	299 errno = ENOSYS;
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	300 #endif
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	301 return -1;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	302 }
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	303
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	304 #if HAVE_WORKING_UTIMES
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	305 return utimes (file, t);
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	306 #else
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	307 {
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	308 struct utimbuf utimbuf;
12157 7fb8a2ac5948 utimens: validate futimens usage Eric Blake <ebb9@byu.net> parents: 12134 diff changeset	309 struct utimbuf *ut;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	310 if (ts)
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	311 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	312 utimbuf.actime = ts[0].tv_sec;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	313 utimbuf.modtime = ts[1].tv_sec;
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	314 ut = &utimbuf;
799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	315 }
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	316 else
12133 799664c0f270 openat, utimens: whitespace cleanup Eric Blake <ebb9@byu.net> parents: 11941 diff changeset	317 ut = NULL;
10133 bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	318
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	319 return utime (file, ut);
bbccff5988c3 Prefer new POSIX 200x interfaces over futimesat. Eric Blake <ebb9@byu.net> parents: 9613 diff changeset	320 }
10154 148190ed341d Provide futimens/utimensat fallbacks for older kernels. Eric Blake <ebb9@byu.net> parents: 10133 diff changeset	321 #endif /* !HAVE_WORKING_UTIMES */
6297 10379892281e * utimens.c (ENOSYS): Define if not already defined. Paul Eggert <eggert@cs.ucla.edu> parents: 6283 diff changeset	322 }
5147 3249aec7f48c Import from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	323 }
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	324
12161 c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	325 /* 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	326 TIMESPEC[0] and TIMESPEC[1], respectively.
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	327 FD must be either negative -- in which case it is ignored --
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	328 or a file descriptor that is open on FILE.
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	329 If FD is nonnegative, then FILE can be NULL, which means
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	330 use just futimes (or equivalent) instead of utimes (or equivalent),
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	331 and fail if on an old system without futimes (or equivalent).
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	332 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	333 Return 0 on success, -1 (setting errno) on failure. */
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	334
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	335 int
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	336 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	337 {
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	338 return fdutimens (file, fd, timespec);
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	339 }
c4a167621772 utimens: introduce fdutimens Eric Blake <ebb9@byu.net> parents: 12160 diff changeset	340
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	341 /* 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	342 TIMESPEC[0] and TIMESPEC[1], respectively. */
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	343 int
863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	344 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	345 {
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	346 return fdutimens (file, -1, timespec);
5485 863556283cee (__attribute__, ATTRIBUTE_UNUSED): New macros. Paul Eggert <eggert@cs.ucla.edu> parents: 5147 diff changeset	347 }
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	348
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	349 /* 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	350 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	351 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	352 changing symlink timestamps, but FILE was a symlink. */
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	353 int
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	354 lutimens (char const *file, struct timespec const timespec[2])
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	355 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	356 struct timespec adjusted_timespec[2];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	357 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	358 int adjustment_needed = 0;
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	359 struct stat st;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	360
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	361 if (ts)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	362 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	363 adjusted_timespec[0] = timespec[0];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	364 adjusted_timespec[1] = timespec[1];
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	365 adjustment_needed = validate_timespec (ts);
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	366 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	367 if (adjustment_needed < 0)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	368 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	369
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	370 /* The Linux kernel did not support symlink timestamps until
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	371 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	372 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	373 worry about bogus return values. */
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	374
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	375 #if HAVE_UTIMENSAT
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	376 if (0 <= utimensat_works_really)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	377 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	378 int result = utimensat (AT_FDCWD, file, ts, AT_SYMLINK_NOFOLLOW);
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	379 # ifdef __linux__
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	380 /* Work around a kernel bug:
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	381 http://bugzilla.redhat.com/442352
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	382 http://bugzilla.redhat.com/449910
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	383 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	384 than -1 upon ENOSYS failure.
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	385 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	386 are no longer in common use. */
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	387 if (0 < result)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	388 errno = ENOSYS;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	389 # endif
12172 52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	390 if (result == 0 \|\| errno != ENOSYS)
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	391 {
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	392 utimensat_works_really = 1;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	393 return result;
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	394 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	395 }
52ebfd595434 utimens: cache whether utimensat syscall works Eric Blake <ebb9@byu.net> parents: 12162 diff changeset	396 utimensat_works_really = -1;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	397 #endif /* HAVE_UTIMENSAT */
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	398
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	399 /* The platform lacks an interface to set file timestamps with
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	400 nanosecond resolution, so do the best we can, discarding any
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	401 fractional part of the timestamp. */
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	402
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	403 if (adjustment_needed)
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	404 {
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	405 if (lstat (file, &st))
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	406 return -1;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	407 if (update_timespec (&st, &ts))
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	408 return 0;
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	409 }
d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	410
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	411 #if HAVE_LUTIMES
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	412 {
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	413 struct timeval timeval[2];
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	414 struct timeval const *t;
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	415 if (ts)
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	416 {
12160 d0732ed2dd55 utimens: add UTIME_NOW and UTIME_OMIT support Eric Blake <ebb9@byu.net> parents: 12158 diff changeset	417 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	418 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	419 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	420 timeval[1].tv_usec = ts[1].tv_nsec / 1000;
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	421 t = timeval;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	422 }
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	423 else
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	424 t = NULL;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	425
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	426 return lutimes (file, t);
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	427 }
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	428 #endif /* HAVE_LUTIMES */
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	429
12173 efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	430 /* Out of luck for symlinks, but we still handle regular files. */
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	431 if (!adjustment_needed && lstat (file, &st))
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	432 return -1;
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	433 if (!S_ISLNK (st.st_mode))
efdb2ab5743f utimens: let lutimens work on non-symlinks Eric Blake <ebb9@byu.net> parents: 12172 diff changeset	434 return fdutimens (file, -1, ts);
12158 899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	435 errno = ENOSYS;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	436 return -1;
899dd13e9f8b utimens: add lutimens interface Eric Blake <ebb9@byu.net> parents: 12157 diff changeset	437 }

Mercurial > hg > octave-shane > gnulib-hg

annotate lib/utimens.c @ 12173:efdb2ab5743f