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annotate lib/utimens.c @ 6297:10379892281e

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* utimens.c (ENOSYS): Define if not already defined. (futimens): Support having a null PATH if the file descriptor is nonnegative.
author Paul Eggert <eggert@cs.ucla.edu>
date Sun, 25 Sep 2005 06:22:34 +0000
parents b377d8796118
children 716071856296
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1 /* Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
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2
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3 This program is free software; you can redistribute it and/or modify it
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4 under the terms of the GNU General Public License as published by the
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5 Free Software Foundation; either version 2, or (at your option) any
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6 later version.
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7
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8 This program is distributed in the hope that it will be useful,
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9 but WITHOUT ANY WARRANTY; without even the implied warranty of
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10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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11 GNU General Public License for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with this program; if not, write to the Free Software Foundation,
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15 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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16
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17 /* Written by Paul Eggert. */
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18
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19 /* derived from a function in touch.c */
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20
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21 #ifdef HAVE_CONFIG_H
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22 # include <config.h>
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23 #endif
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24
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25 #include "utimens.h"
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26
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27 #include <errno.h>
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28 #include <fcntl.h>
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29
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30 #if HAVE_UTIME_H
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31 # include <utime.h>
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32 #endif
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33
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34 /* Some systems (even some that do have <utime.h>) don't declare this
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35 structure anywhere. */
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36 #ifndef HAVE_STRUCT_UTIMBUF
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37 struct utimbuf
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38 {
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39 long actime;
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40 long modtime;
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41 };
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42 #endif
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43
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44 /* Some systems don't have ENOSYS. */
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45 #ifndef ENOSYS
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46 # ifdef ENOTSUP
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47 # define ENOSYS ENOTSUP
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48 # else
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49 /* Some systems don't have ENOTSUP either. */
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50 # define ENOSYS EINVAL
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51 # endif
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52 #endif
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53
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54 #if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
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55 # define __attribute__(x)
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56 #endif
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57
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58 #ifndef ATTRIBUTE_UNUSED
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59 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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60 #endif
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61
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62 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
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63 TIMESPEC[0] and TIMESPEC[1], respectively.
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64 FD must be either negative -- in which case it is ignored --
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65 or a file descriptor that is open on FILE.
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66 If FD is nonnegative, then FILE can be NULL, which means
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67 use just futimes (or equivalent) instead of utimes (or equivalent),
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68 and fail if on an old system without futimes (or equivalent).
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69 If TIMESPEC is null, set the time stamps to the current time.
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70 Return 0 on success, -1 (setting errno) on failure. */
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71
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72 int
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73 futimens (int fd ATTRIBUTE_UNUSED,
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74 char const *file, struct timespec const timespec[2])
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75 {
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76 /* There's currently no interface to set file timestamps with
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77 nanosecond resolution, so do the best we can, discarding any
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78 fractional part of the timestamp. */
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79 #if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
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80 struct timeval timeval[2];
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81 struct timeval const *t;
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82 if (timespec)
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83 {
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84 timeval[0].tv_sec = timespec[0].tv_sec;
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85 timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
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86 timeval[1].tv_sec = timespec[1].tv_sec;
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87 timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
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88 t = timeval;
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89 }
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90 else
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91 t = NULL;
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92
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93 # if HAVE_FUTIMESAT
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94 return fd < 0 ? futimesat (AT_FDCWD, file, t) : futimesat (fd, NULL, t);
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95 # elif HAVE_FUTIMES
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96 if (0 <= fd)
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97 {
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98 if (futimes (fd, t) == 0)
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99 return 0;
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100
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101 /* On GNU/Linux without the futimes syscall and without /proc
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102 mounted, glibc futimes fails with errno == ENOENT. Fall back
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103 on utimes if we get a weird error number like that. */
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104 switch (errno)
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105 {
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106 case EACCES:
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107 case EIO:
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108 case EPERM:
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109 case EROFS:
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110 return -1;
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111 }
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112 }
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113 # endif
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114 #endif
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115
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116 #if ! HAVE_FUTIMES_AT
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117
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118 if (!file)
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119 {
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120 errno = ENOSYS;
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121 return -1;
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122 }
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123
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124 # if HAVE_WORKING_UTIMES
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125 return utimes (file, t);
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126 # else
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127 {
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128 struct utimbuf utimbuf;
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129 struct utimbuf const *ut;
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130 if (timespec)
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131 {
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132 utimbuf.actime = timespec[0].tv_sec;
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133 utimbuf.modtime = timespec[1].tv_sec;
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134 ut = &utimbuf;
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135 }
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136 else
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137 ut = NULL;
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138
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139 return utime (file, ut);
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140 }
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141 # endif
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142
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143 #endif
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144 }
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145
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146 /* Set the access and modification time stamps of FILE to be
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147 TIMESPEC[0] and TIMESPEC[1], respectively. */
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148 int
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149 utimens (char const *file, struct timespec const timespec[2])
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150 {
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151 return futimens (-1, file, timespec);
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152 }