gnulib: lib/utimecmp.c annotate

annotate lib/utimecmp.c @ 40235:5a52ef2d4772

all: Update URLs to msdn.microsoft.com. * lib/stat-w32.c et al.: Update URLs after most of msdn.microsoft.com was moved to docs.microsoft.com.

author	Bruno Haible <bruno@clisp.org>
date	Thu, 14 Mar 2019 09:49:24 +0100
parents	b06060465f09
children

rev	line source
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	1 /* utimecmp.c -- compare file timestamps
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	2
40057 b06060465f09 maint: Run 'make update-copyright' Paul Eggert <eggert@cs.ucla.edu> parents: 19595 diff changeset	3 Copyright (C) 2004-2007, 2009-2019 Free Software Foundation, Inc.
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	4
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 8223 diff changeset	5 This program is free software: you can redistribute it and/or modify
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	6 it under the terms of the GNU General Public License as published by
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 8223 diff changeset	7 the Free Software Foundation; either version 3 of the License, or
bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 8223 diff changeset	8 (at your option) any later version.
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	9
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	10 This program is distributed in the hope that it will be useful,
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	11 but WITHOUT ANY WARRANTY; without even the implied warranty of
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	13 GNU General Public License for more details.
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	14
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	15 You should have received a copy of the GNU General Public License
19190 9759915b2aca all: prefer https: URLs Paul Eggert <eggert@cs.ucla.edu> parents: 18842 diff changeset	16 along with this program. If not, see <https://www.gnu.org/licenses/>. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	17
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	18 /* Written by Paul Eggert. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	19
7302 8a1a9361108c * _fpending.c: Include <config.h> unconditionally, since we no Paul Eggert <eggert@cs.ucla.edu> parents: 7162 diff changeset	20 #include <config.h>
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	21
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	22 #include "utimecmp.h"
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	23
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	24 #include <fcntl.h>
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	25 #include <limits.h>
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	26 #include <stdbool.h>
7162 19c2e5121b2f Add and change modules to make it easier for coreutils to use Paul Eggert <eggert@cs.ucla.edu> parents: 6323 diff changeset	27 #include <stdint.h>
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	28 #include <stdlib.h>
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	29 #include <sys/stat.h>
8223 ca249819379f * lib/getdate.h (includes): Include <time.h>, not "timespec.h". Eric Blake <ebb9@byu.net> parents: 7406 diff changeset	30 #include <time.h>
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	31 #include <unistd.h>
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	32
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	33 #include "dirname.h"
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	34 #include "hash.h"
5691 ec62790f0938 Factor int-properties macros into a single file, except for Paul Eggert <eggert@cs.ucla.edu> parents: 5148 diff changeset	35 #include "intprops.h"
6238 245950d70306 * utimecmp.c: Include stat-time.h. Paul Eggert <eggert@cs.ucla.edu> parents: 5848 diff changeset	36 #include "stat-time.h"
6323 af09cfa36fd5 * modules/exclude (Depends-on): Depend on verify. Paul Eggert <eggert@cs.ucla.edu> parents: 6259 diff changeset	37 #include "verify.h"
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	38
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	39 #ifndef MAX
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	40 # define MAX(a, b) ((a) > (b) ? (a) : (b))
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	41 #endif
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	42
12727 fd5b0bf2a8e9 utimecmp: avoid new warning from upcoming gcc-4.5.0 Jim Meyering <meyering@redhat.com> parents: 12559 diff changeset	43 #define BILLION (1000 * 1000 * 1000)
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	44
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	45 /* Best possible resolution that utimens can set and stat can return,
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	46 due to system-call limitations. It must be a power of 10 that is
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	47 no greater than 1 billion. */
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	48 #if HAVE_UTIMENSAT
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	49 enum { SYSCALL_RESOLUTION = 1 };
19595 beb2ad957aca Simplify code. Drop support for Borland C++ on Windows. Bruno Haible <bruno@clisp.org> parents: 19534 diff changeset	50 #elif defined _WIN32 && ! defined __CYGWIN__
18842 3f720a2a9979 utimecmp: Add support for native Windows. Bruno Haible <bruno@clisp.org> parents: 18663 diff changeset	51 /* On native Windows, file times have 100 ns resolution. See
40235 5a52ef2d4772 all: Update URLs to msdn.microsoft.com. Bruno Haible <bruno@clisp.org> parents: 40057 diff changeset	52 <https://docs.microsoft.com/en-us/windows/desktop/api/minwinbase/ns-minwinbase-filetime> */
18842 3f720a2a9979 utimecmp: Add support for native Windows. Bruno Haible <bruno@clisp.org> parents: 18663 diff changeset	53 enum { SYSCALL_RESOLUTION = 100 };
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	54 #elif ((HAVE_FUTIMESAT \|\| HAVE_WORKING_UTIMES) \
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	55 && (defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC \
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	56 \|\| defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC \
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	57 \|\| defined HAVE_STRUCT_STAT_ST_ATIMENSEC \
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	58 \|\| defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC \
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	59 \|\| defined HAVE_STRUCT_STAT_ST_SPARE1))
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	60 enum { SYSCALL_RESOLUTION = 1000 };
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	61 #else
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	62 enum { SYSCALL_RESOLUTION = BILLION };
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	63 #endif
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	64
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	65 /* Describe a file system and its timestamp resolution in nanoseconds. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	66 struct fs_res
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	67 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	68 /* Device number of file system. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	69 dev_t dev;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	70
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	71 /* An upper bound on the timestamp resolution of this file system,
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	72 ignoring any resolution that cannot be set via utimens. It is
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	73 represented by an integer count of nanoseconds. It must be
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	74 either 2 billion, or a power of 10 that is no greater than a
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	75 billion and is no less than SYSCALL_RESOLUTION. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	76 int resolution;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	77
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	78 /* True if RESOLUTION is known to be exact, and is not merely an
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	79 upper bound on the true resolution. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	80 bool exact;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	81 };
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	82
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	83 /* Hash some device info. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	84 static size_t
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	85 dev_info_hash (void const *x, size_t table_size)
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	86 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	87 struct fs_res const *p = x;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	88
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	89 /* Beware signed arithmetic gotchas. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	90 if (TYPE_SIGNED (dev_t) && SIZE_MAX < MAX (INT_MAX, TYPE_MAXIMUM (dev_t)))
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	91 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	92 uintmax_t dev = p->dev;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	93 return dev % table_size;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	94 }
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	95
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	96 return p->dev % table_size;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	97 }
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	98
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	99 /* Compare two dev_info structs. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	100 static bool
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	101 dev_info_compare (void const x, void const y)
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	102 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	103 struct fs_res const *a = x;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	104 struct fs_res const *b = y;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	105 return a->dev == b->dev;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	106 }
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	107
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	108 /* Return -1, 0, 1 based on whether the destination file (relative
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	109 to openat-like directory file descriptor DFD with name
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	110 DST_NAME and status DST_STAT) is older than SRC_STAT, the same age
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	111 as SRC_STAT, or newer than SRC_STAT, respectively.
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	112
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	113 DST_NAME may be NULL if OPTIONS is 0.
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	114
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	115 If OPTIONS & UTIMECMP_TRUNCATE_SOURCE, do the comparison after SRC is
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	116 converted to the destination's timestamp resolution as filtered through
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	117 utimens. In this case, return -2 if the exact answer cannot be
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	118 determined; this can happen only if the timestamps are very close and
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	119 there is some trouble accessing the file system (e.g., the user does not
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	120 have permission to futz with the destination's timestamps). */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	121
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	122 int
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	123 utimecmp (char const *dst_name,
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	124 struct stat const *dst_stat,
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	125 struct stat const *src_stat,
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	126 int options)
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	127 {
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	128 return utimecmpat (AT_FDCWD, dst_name, dst_stat, src_stat, options);
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	129 }
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	130
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	131 int
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	132 utimecmpat (int dfd, char const *dst_name,
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	133 struct stat const *dst_stat,
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	134 struct stat const *src_stat,
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	135 int options)
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	136 {
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	137 /* Things to watch out for:
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	138
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	139 The code uses a static hash table internally and is not safe in the
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	140 presence of signals, multiple threads, etc. However, memory pressure
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	141 that prevents use of the hash table is not fatal - we just fall back
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	142 to redoing the computations on every call in that case.
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	143
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	144 int and long int might be 32 bits. Many of the calculations store
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	145 numbers up to 2 billion, and multiply by 10; they have to avoid
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	146 multiplying 2 billion by 10, as this exceeds 32-bit capabilities.
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	147
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	148 time_t might be unsigned. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	149
6323 af09cfa36fd5 * modules/exclude (Depends-on): Depend on verify. Paul Eggert <eggert@cs.ucla.edu> parents: 6259 diff changeset	150 verify (TYPE_IS_INTEGER (time_t));
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	151
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	152 /* Destination and source timestamps. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	153 time_t dst_s = dst_stat->st_mtime;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	154 time_t src_s = src_stat->st_mtime;
6238 245950d70306 * utimecmp.c: Include stat-time.h. Paul Eggert <eggert@cs.ucla.edu> parents: 5848 diff changeset	155 int dst_ns = get_stat_mtime_ns (dst_stat);
245950d70306 * utimecmp.c: Include stat-time.h. Paul Eggert <eggert@cs.ucla.edu> parents: 5848 diff changeset	156 int src_ns = get_stat_mtime_ns (src_stat);
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	157
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	158 if (options & UTIMECMP_TRUNCATE_SOURCE)
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	159 {
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	160 /* Look up the timestamp resolution for the destination device. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	161
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	162 /* Hash table for caching information learned about devices. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	163 static Hash_table *ht;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	164
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	165 /* Information about the destination file system. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	166 static struct fs_res *new_dst_res;
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	167 struct fs_res *dst_res = NULL;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	168 struct fs_res tmp_dst_res;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	169
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	170 /* timestamp resolution in nanoseconds. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	171 int res;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	172
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	173 /* Quick exit, if possible. Since the worst resolution is 2
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	174 seconds, anything that differs by more than that does not
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	175 needs source truncation. */
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	176 if (dst_s == src_s && dst_ns == src_ns)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	177 return 0;
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	178 if (dst_s <= src_s - 2)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	179 return -1;
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	180 if (src_s <= dst_s - 2)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	181 return 1;
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	182
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	183 /* Try to do a hash lookup, but fall back to stack variables and
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	184 recomputation on low memory situations. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	185 if (! ht)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	186 ht = hash_initialize (16, NULL, dev_info_hash, dev_info_compare, free);
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	187 if (ht)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	188 {
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	189 if (! new_dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	190 {
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	191 new_dst_res = malloc (sizeof *new_dst_res);
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	192 if (!new_dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	193 goto low_memory;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	194 new_dst_res->resolution = 2 * BILLION;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	195 new_dst_res->exact = false;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	196 }
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	197 new_dst_res->dev = dst_stat->st_dev;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	198 dst_res = hash_insert (ht, new_dst_res);
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	199 if (! dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	200 goto low_memory;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	201
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	202 if (dst_res == new_dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	203 {
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	204 /* NEW_DST_RES is now in use in the hash table, so allocate a
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	205 new entry next time. */
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	206 new_dst_res = NULL;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	207 }
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	208 }
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	209 else
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	210 {
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	211 low_memory:
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	212 if (ht)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	213 {
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	214 tmp_dst_res.dev = dst_stat->st_dev;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	215 dst_res = hash_lookup (ht, &tmp_dst_res);
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	216 }
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	217 if (!dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	218 {
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	219 dst_res = &tmp_dst_res;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	220 dst_res->resolution = 2 * BILLION;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	221 dst_res->exact = false;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	222 }
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	223 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	224
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	225 res = dst_res->resolution;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	226
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	227 #ifdef _PC_TIMESTAMP_RESOLUTION
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	228 /* If the system will tell us the resolution, we're set! */
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	229 if (! dst_res->exact)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	230 {
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	231 res = -1;
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	232 if (dfd == AT_FDCWD)
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	233 res = pathconf (dst_name, _PC_TIMESTAMP_RESOLUTION);
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	234 else
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	235 {
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	236 char *dstdir = mdir_name (dst_name);
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	237 if (dstdir)
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	238 {
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	239 int destdirfd = openat (dfd, dstdir,
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	240 O_SEARCH \| O_CLOEXEC \| O_DIRECTORY);
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	241 if (0 <= destdirfd)
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	242 {
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	243 res = fpathconf (destdirfd, _PC_TIMESTAMP_RESOLUTION);
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	244 close (destdirfd);
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	245 }
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	246 free (dstdir);
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	247 }
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	248 }
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	249 if (0 < res)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	250 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	251 dst_res->resolution = res;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	252 dst_res->exact = true;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	253 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	254 }
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	255 #endif
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	256
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	257 if (! dst_res->exact)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	258 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	259 /* This file system's resolution is not known exactly.
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	260 Deduce it, and store the result in the hash table. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	261
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	262 time_t dst_a_s = dst_stat->st_atime;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	263 time_t dst_c_s = dst_stat->st_ctime;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	264 time_t dst_m_s = dst_s;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	265 int dst_a_ns = get_stat_atime_ns (dst_stat);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	266 int dst_c_ns = get_stat_ctime_ns (dst_stat);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	267 int dst_m_ns = dst_ns;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	268
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	269 /* Set RES to an upper bound on the file system resolution
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	270 (after truncation due to SYSCALL_RESOLUTION) by inspecting
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	271 the atime, ctime and mtime of the existing destination.
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	272 We don't know of any file system that stores atime or
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	273 ctime with a higher precision than mtime, so it's valid to
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	274 look at them too. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	275 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	276 bool odd_second = (dst_a_s \| dst_c_s \| dst_m_s) & 1;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	277
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	278 if (SYSCALL_RESOLUTION == BILLION)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	279 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	280 if (odd_second \| dst_a_ns \| dst_c_ns \| dst_m_ns)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	281 res = BILLION;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	282 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	283 else
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	284 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	285 int a = dst_a_ns;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	286 int c = dst_c_ns;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	287 int m = dst_m_ns;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	288
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	289 /* Write it this way to avoid mistaken GCC warning
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	290 about integer overflow in constant expression. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	291 int SR10 = SYSCALL_RESOLUTION; SR10 *= 10;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	292
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	293 if ((a % SR10 \| c % SR10 \| m % SR10) != 0)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	294 res = SYSCALL_RESOLUTION;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	295 else
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	296 for (res = SR10, a /= SR10, c /= SR10, m /= SR10;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	297 (res < dst_res->resolution
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	298 && (a % 10 \| c % 10 \| m % 10) == 0);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	299 res *= 10, a /= 10, c /= 10, m /= 10)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	300 if (res == BILLION)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	301 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	302 if (! odd_second)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	303 res *= 2;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	304 break;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	305 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	306 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	307
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	308 dst_res->resolution = res;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	309 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	310
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	311 if (SYSCALL_RESOLUTION < res)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	312 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	313 struct timespec timespec[2];
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	314 struct stat dst_status;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	315
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	316 /* Ignore source timestamp information that must necessarily
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	317 be lost when filtered through utimens. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	318 src_ns -= src_ns % SYSCALL_RESOLUTION;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	319
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	320 /* If the timestamps disagree widely enough, there's no need
caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	321 to interrogate the file system to deduce the exact
caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	322 timestamp resolution; return the answer directly. */
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	323 {
18441 c204ad2f4289 utimecmp: avoid new GCC 7 warning from -Wbool-operation Jim Meyering <meyering@fb.com> parents: 18294 diff changeset	324 time_t s = src_s & ~ (res == 2 * BILLION ? 1 : 0);
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	325 if (src_s < dst_s \|\| (src_s == dst_s && src_ns <= dst_ns))
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	326 return 1;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	327 if (dst_s < s
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	328 \|\| (dst_s == s && dst_ns < src_ns - src_ns % res))
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	329 return -1;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	330 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	331
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	332 /* Determine the actual timestamp resolution for the
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	333 destination file system (after truncation due to
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	334 SYSCALL_RESOLUTION) by setting the access timestamp of the
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	335 destination to the existing access time, except with
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	336 trailing nonzero digits. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	337
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	338 timespec[0].tv_sec = dst_a_s;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	339 timespec[0].tv_nsec = dst_a_ns;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	340 timespec[1].tv_sec = dst_m_s \| (res == 2 * BILLION);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	341 timespec[1].tv_nsec = dst_m_ns + res / 9;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	342
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	343 if (utimensat (dfd, dst_name, timespec, AT_SYMLINK_NOFOLLOW))
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	344 return -2;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	345
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	346 /* Read the modification time that was set. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	347 {
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	348 int stat_result
e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	349 = fstatat (dfd, dst_name, &dst_status, AT_SYMLINK_NOFOLLOW);
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	350
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	351 if (stat_result
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	352 \| (dst_status.st_mtime ^ dst_m_s)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	353 \| (get_stat_mtime_ns (&dst_status) ^ dst_m_ns))
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	354 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	355 /* The modification time changed, or we can't tell whether
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	356 it changed. Change it back as best we can. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	357 timespec[1].tv_sec = dst_m_s;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	358 timespec[1].tv_nsec = dst_m_ns;
19534 e64c6a43dc9c utimecmp: new function utimecmpat Paul Eggert <eggert@cs.ucla.edu> parents: 19484 diff changeset	359 utimensat (dfd, dst_name, timespec, AT_SYMLINK_NOFOLLOW);
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	360 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	361
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	362 if (stat_result != 0)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	363 return -2;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	364 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	365
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	366 /* Determine the exact resolution from the modification time
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	367 that was read back. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	368 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	369 int old_res = res;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	370 int a = (BILLION * (dst_status.st_mtime & 1)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	371 + get_stat_mtime_ns (&dst_status));
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	372
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	373 res = SYSCALL_RESOLUTION;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	374
13914 cc15a32c0446 utimecmp: fine-grained src to nearby coarse-grained dest Paul Eggert <eggert@cs.ucla.edu> parents: 12727 diff changeset	375 for (a /= res; a % 10 == 0; a /= 10)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	376 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	377 if (res == BILLION)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	378 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	379 res *= 2;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	380 break;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	381 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	382 res *= 10;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	383 if (res == old_res)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	384 break;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	385 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	386 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	387 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	388
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	389 dst_res->resolution = res;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	390 dst_res->exact = true;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	391 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	392
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	393 /* Truncate the source's timestamp according to the resolution. */
18441 c204ad2f4289 utimecmp: avoid new GCC 7 warning from -Wbool-operation Jim Meyering <meyering@fb.com> parents: 18294 diff changeset	394 src_s &= ~ (res == 2 * BILLION ? 1 : 0);
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	395 src_ns -= src_ns % res;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	396 }
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	397
18663 caf9d6314c8f maint: time stamp -> timestamp Paul Eggert <eggert@cs.ucla.edu> parents: 18626 diff changeset	398 /* Compare the timestamps and return -1, 0, 1 accordingly. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	399 return (dst_s < src_s ? -1
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	400 : dst_s > src_s ? 1
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	401 : dst_ns < src_ns ? -1
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	402 : dst_ns > src_ns);
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	403 }

Mercurial > gnulib

annotate lib/utimecmp.c @ 40235:5a52ef2d4772