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

annotate lib/utimecmp.c @ 16201:8250f2777afc

maint: update all copyright year number ranges Run "make update-copyright".

author	Jim Meyering <meyering@redhat.com>
date	Sun, 01 Jan 2012 10:04:58 +0100
parents	1e0bf20577a1
children	e542fd46ad6f

rev	line source
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	1 /* utimecmp.c -- compare file time stamps
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	2
16201 8250f2777afc maint: update all copyright year number ranges Jim Meyering <meyering@redhat.com> parents: 14642 diff changeset	3 Copyright (C) 2004-2007, 2009-2012 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
9309 bbbbbf4cd1c5 Change copyright notice from GPLv2+ to GPLv3+. Bruno Haible <bruno@clisp.org> parents: 8223 diff changeset	16 along with this program. If not, see <http://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
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	24 #include <limits.h>
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	25 #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	26 #include <stdint.h>
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	27 #include <stdlib.h>
8223 ca249819379f * lib/getdate.h (includes): Include <time.h>, not "timespec.h". Eric Blake <ebb9@byu.net> parents: 7406 diff changeset	28 #include <time.h>
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	29 #include <unistd.h>
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	30
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	31 #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	32 #include "intprops.h"
6238 245950d70306 * utimecmp.c: Include stat-time.h. Paul Eggert <eggert@cs.ucla.edu> parents: 5848 diff changeset	33 #include "stat-time.h"
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	34 #include "utimens.h"
6323 af09cfa36fd5 * modules/exclude (Depends-on): Depend on verify. Paul Eggert <eggert@cs.ucla.edu> parents: 6259 diff changeset	35 #include "verify.h"
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	36
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	37 #ifndef MAX
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	38 # define MAX(a, b) ((a) > (b) ? (a) : (b))
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	39 #endif
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	40
12727 fd5b0bf2a8e9 utimecmp: avoid new warning from upcoming gcc-4.5.0 Jim Meyering <meyering@redhat.com> parents: 12559 diff changeset	41 #define BILLION (1000 * 1000 * 1000)
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	42
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	43 /* Best possible resolution that utimens can set and stat can return,
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	44 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	45 no greater than 1 billion. */
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	46 #if HAVE_UTIMENSAT
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	47 enum { SYSCALL_RESOLUTION = 1 };
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	48 #elif ((HAVE_FUTIMESAT \|\| HAVE_WORKING_UTIMES) \
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	49 && (defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC \
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	50 \|\| defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC \
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	51 \|\| defined HAVE_STRUCT_STAT_ST_ATIMENSEC \
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	52 \|\| 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	53 \|\| defined HAVE_STRUCT_STAT_ST_SPARE1))
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	54 enum { SYSCALL_RESOLUTION = 1000 };
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	55 #else
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	56 enum { SYSCALL_RESOLUTION = BILLION };
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	57 #endif
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	58
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	59 /* Describe a file system and its time stamp resolution in nanoseconds. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	60 struct fs_res
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	61 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	62 /* Device number of file system. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	63 dev_t dev;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	64
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	65 /* An upper bound on the time stamp resolution of this file system,
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	66 ignoring any resolution that cannot be set via utimens. It is
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	67 represented by an integer count of nanoseconds. It must be
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	68 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	69 billion and is no less than SYSCALL_RESOLUTION. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	70 int resolution;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	71
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	72 /* 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	73 upper bound on the true resolution. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	74 bool exact;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	75 };
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	76
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	77 /* Hash some device info. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	78 static size_t
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	79 dev_info_hash (void const *x, size_t table_size)
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	80 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	81 struct fs_res const *p = x;
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 /* Beware signed arithmetic gotchas. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	84 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	85 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	86 uintmax_t dev = p->dev;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	87 return dev % table_size;
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
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	90 return p->dev % table_size;
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
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	93 /* Compare two dev_info structs. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	94 static bool
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	95 dev_info_compare (void const x, void const y)
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	96 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	97 struct fs_res const *a = x;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	98 struct fs_res const *b = y;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	99 return a->dev == b->dev;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	100 }
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	101
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	102 /* Return -1, 0, 1 based on whether the destination file (with name
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	103 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	104 as SRC_STAT, or newer than SRC_STAT, respectively.
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	105
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	106 DST_NAME may be NULL if OPTIONS is 0.
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	107
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	108 If OPTIONS & UTIMECMP_TRUNCATE_SOURCE, do the comparison after SRC is
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	109 converted to the destination's timestamp resolution as filtered through
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	110 utimens. In this case, return -2 if the exact answer cannot be
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	111 determined; this can happen only if the time stamps are very close and
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	112 there is some trouble accessing the file system (e.g., the user does not
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	113 have permission to futz with the destination's time stamps). */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	114
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	115 int
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	116 utimecmp (char const *dst_name,
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	117 struct stat const *dst_stat,
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	118 struct stat const *src_stat,
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	119 int options)
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	120 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	121 /* Things to watch out for:
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	122
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	123 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	124 presence of signals, multiple threads, etc. However, memory pressure
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	125 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	126 to redoing the computations on every call in that case.
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	127
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	128 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	129 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	130 multiplying 2 billion by 10, as this exceeds 32-bit capabilities.
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	131
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	132 time_t might be unsigned. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	133
6323 af09cfa36fd5 * modules/exclude (Depends-on): Depend on verify. Paul Eggert <eggert@cs.ucla.edu> parents: 6259 diff changeset	134 verify (TYPE_IS_INTEGER (time_t));
af09cfa36fd5 * modules/exclude (Depends-on): Depend on verify. Paul Eggert <eggert@cs.ucla.edu> parents: 6259 diff changeset	135 verify (TYPE_TWOS_COMPLEMENT (int));
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	136
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	137 /* Destination and source time stamps. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	138 time_t dst_s = dst_stat->st_mtime;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	139 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	140 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	141 int src_ns = get_stat_mtime_ns (src_stat);
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	142
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	143 if (options & UTIMECMP_TRUNCATE_SOURCE)
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	144 {
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	145 /* Look up the time stamp resolution for the destination device. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	146
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	147 /* Hash table for caching information learned about devices. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	148 static Hash_table *ht;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	149
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	150 /* Information about the destination file system. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	151 static struct fs_res *new_dst_res;
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	152 struct fs_res *dst_res = NULL;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	153 struct fs_res tmp_dst_res;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	154
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	155 /* Time stamp resolution in nanoseconds. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	156 int res;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	157
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	158 /* 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	159 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	160 needs source truncation. */
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	161 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	162 return 0;
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	163 if (dst_s <= src_s - 2)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	164 return -1;
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	165 if (src_s <= dst_s - 2)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	166 return 1;
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	167
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	168 /* 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	169 recomputation on low memory situations. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	170 if (! ht)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	171 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	172 if (ht)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	173 {
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	174 if (! new_dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	175 {
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	176 new_dst_res = malloc (sizeof *new_dst_res);
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	177 if (!new_dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	178 goto low_memory;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	179 new_dst_res->resolution = 2 * BILLION;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	180 new_dst_res->exact = false;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	181 }
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	182 new_dst_res->dev = dst_stat->st_dev;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	183 dst_res = hash_insert (ht, new_dst_res);
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	184 if (! dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	185 goto low_memory;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	186
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	187 if (dst_res == new_dst_res)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	188 {
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	189 /* 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	190 new entry next time. */
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	191 new_dst_res = NULL;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	192 }
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	193 }
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	194 else
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	195 {
14642 1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	196 low_memory:
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	197 if (ht)
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	198 {
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	199 tmp_dst_res.dev = dst_stat->st_dev;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	200 dst_res = hash_lookup (ht, &tmp_dst_res);
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)
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 dst_res = &tmp_dst_res;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	205 dst_res->resolution = 2 * BILLION;
1e0bf20577a1 utimecmp: drop dependency on xmalloc Eric Blake <eblake@redhat.com> parents: 14079 diff changeset	206 dst_res->exact = false;
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 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	209
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	210 res = dst_res->resolution;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	211
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	212 #ifdef _PC_TIMESTAMP_RESOLUTION
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	213 /* 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	214 if (! dst_res->exact)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	215 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	216 res = pathconf (dst_name, _PC_TIMESTAMP_RESOLUTION);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	217 if (0 < res)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	218 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	219 dst_res->resolution = res;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	220 dst_res->exact = true;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	221 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	222 }
12159 0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	223 #endif
0ae159ba1adf utimecmp: support symlink timestamps Eric Blake <ebb9@byu.net> parents: 9309 diff changeset	224
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	225 if (! dst_res->exact)
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	226 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	227 /* 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	228 Deduce it, and store the result in the hash table. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	229
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	230 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	231 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	232 time_t dst_m_s = dst_s;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	233 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	234 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	235 int dst_m_ns = dst_ns;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	236
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	237 /* 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	238 (after truncation due to SYSCALL_RESOLUTION) by inspecting
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	239 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	240 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	241 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	242 look at them too. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	243 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	244 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	245
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	246 if (SYSCALL_RESOLUTION == BILLION)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	247 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	248 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	249 res = BILLION;
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 else
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	252 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	253 int a = dst_a_ns;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	254 int c = dst_c_ns;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	255 int m = dst_m_ns;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	256
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	257 /* 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	258 about integer overflow in constant expression. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	259 int SR10 = SYSCALL_RESOLUTION; SR10 *= 10;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	260
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	261 if ((a % SR10 \| c % SR10 \| m % SR10) != 0)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	262 res = SYSCALL_RESOLUTION;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	263 else
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	264 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	265 (res < dst_res->resolution
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	266 && (a % 10 \| c % 10 \| m % 10) == 0);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	267 res *= 10, a /= 10, c /= 10, m /= 10)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	268 if (res == BILLION)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	269 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	270 if (! odd_second)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	271 res *= 2;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	272 break;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	273 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	274 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	275
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	276 dst_res->resolution = res;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	277 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	278
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	279 if (SYSCALL_RESOLUTION < res)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	280 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	281 struct timespec timespec[2];
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	282 struct stat dst_status;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	283
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	284 /* Ignore source time stamp information that must necessarily
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	285 be lost when filtered through utimens. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	286 src_ns -= src_ns % SYSCALL_RESOLUTION;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	287
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	288 /* If the time stamps disagree widely enough, there's no need
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	289 to interrogate the file system to deduce the exact time
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	290 stamp resolution; return the answer directly. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	291 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	292 time_t s = src_s & ~ (res == 2 * BILLION);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	293 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	294 return 1;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	295 if (dst_s < s
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	296 \|\| (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	297 return -1;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	298 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	299
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	300 /* Determine the actual time stamp resolution for the
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	301 destination file system (after truncation due to
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	302 SYSCALL_RESOLUTION) by setting the access time stamp of the
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	303 destination to the existing access time, except with
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	304 trailing nonzero digits. */
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	305
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	306 timespec[0].tv_sec = dst_a_s;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	307 timespec[0].tv_nsec = dst_a_ns;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	308 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	309 timespec[1].tv_nsec = dst_m_ns + res / 9;
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 /* Set the modification time. But don't try to set the
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	312 modification time of symbolic links; on many hosts this sets
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	313 the time of the pointed-to file. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	314 if ((S_ISLNK (dst_stat->st_mode)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	315 ? lutimens (dst_name, timespec)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	316 : utimens (dst_name, timespec)) != 0)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	317 return -2;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	318
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	319 /* Read the modification time that was set. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	320 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	321 int stat_result = (S_ISLNK (dst_stat->st_mode)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	322 ? lstat (dst_name, &dst_status)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	323 : stat (dst_name, &dst_status));
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	324
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	325 if (stat_result
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	326 \| (dst_status.st_mtime ^ dst_m_s)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	327 \| (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	328 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	329 /* 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	330 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	331 timespec[1].tv_sec = dst_m_s;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	332 timespec[1].tv_nsec = dst_m_ns;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	333 if (S_ISLNK (dst_stat->st_mode))
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	334 lutimens (dst_name, timespec);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	335 else
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	336 utimens (dst_name, timespec);
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	337 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	338
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	339 if (stat_result != 0)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	340 return -2;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	341 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	342
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	343 /* Determine the exact resolution from the modification time
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	344 that was read back. */
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	345 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	346 int old_res = res;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	347 int a = (BILLION * (dst_status.st_mtime & 1)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	348 + get_stat_mtime_ns (&dst_status));
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	349
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	350 res = SYSCALL_RESOLUTION;
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	351
13914 cc15a32c0446 utimecmp: fine-grained src to nearby coarse-grained dest Paul Eggert <eggert@cs.ucla.edu> parents: 12727 diff changeset	352 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	353 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	354 if (res == BILLION)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	355 {
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	356 res *= 2;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	357 break;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	358 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	359 res *= 10;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	360 if (res == old_res)
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	361 break;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	362 }
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	363 }
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 dst_res->resolution = res;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	367 dst_res->exact = true;
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	368 }
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	369
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	370 /* Truncate the source's time stamp according to the resolution. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	371 src_s &= ~ (res == 2 * BILLION);
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	372 src_ns -= src_ns % res;
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	373 }
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	374
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	375 /* Compare the time stamps and return -1, 0, 1 accordingly. */
a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	376 return (dst_s < src_s ? -1
12421 e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	377 : dst_s > src_s ? 1
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	378 : dst_ns < src_ns ? -1
e8d2c6fc33ad Use spaces for indentation, not tabs. Bruno Haible <bruno@clisp.org> parents: 12159 diff changeset	379 : dst_ns > src_ns);
5148 a7cf26af736e Merge from coreutils. Paul Eggert <eggert@cs.ucla.edu> parents: diff changeset	380 }

Mercurial > hg > octave-shane > gnulib-hg

annotate lib/utimecmp.c @ 16201:8250f2777afc