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annotate lib/utimens.c @ 7713:064005e1c3c3

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Prefer fd < 0 to ! (0 <= fd).
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 05 Dec 2006 18:13:50 +0000
parents aead3397193a
children b7a83a69ac23
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1 /* Set file access and modification times.
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2
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3 Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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4
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5 This program is free software; you can redistribute it and/or modify it
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6 under the terms of the GNU General Public License as published by the
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7 Free Software Foundation; either version 2, or (at your option) any
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8 later version.
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9
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10 This program is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 GNU General Public License for more details.
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14
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15 You should have received a copy of the GNU General Public License
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16 along with this program; if not, write to the Free Software Foundation,
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a48fb0e98c8c *** empty log message ***
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17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */
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18
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19 /* Written by Paul Eggert. */
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20
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21 /* derived from a function in touch.c */
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22
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23 #include <config.h>
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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 #include <unistd.h>
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30
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31 #if HAVE_UTIME_H
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32 # include <utime.h>
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33 #endif
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34
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35 /* Some systems (even some that do have <utime.h>) don't declare this
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36 structure anywhere. */
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37 #ifndef HAVE_STRUCT_UTIMBUF
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38 struct utimbuf
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39 {
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40 long actime;
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41 long modtime;
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42 };
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43 #endif
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44
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45 /* Some systems don't have ENOSYS. */
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46 #ifndef ENOSYS
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47 # ifdef ENOTSUP
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48 # define ENOSYS ENOTSUP
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49 # else
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50 /* Some systems don't have ENOTSUP either. */
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51 # define ENOSYS EINVAL
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52 # endif
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53 #endif
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54
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55 #ifndef __attribute__
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56 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__
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57 # define __attribute__(x)
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58 # endif
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59 #endif
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60
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61 #ifndef ATTRIBUTE_UNUSED
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62 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
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63 #endif
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64
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65 /* Set the access and modification time stamps of FD (a.k.a. FILE) to be
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66 TIMESPEC[0] and TIMESPEC[1], respectively.
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67 FD must be either negative -- in which case it is ignored --
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68 or a file descriptor that is open on FILE.
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69 If FD is nonnegative, then FILE can be NULL, which means
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70 use just futimes (or equivalent) instead of utimes (or equivalent),
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71 and fail if on an old system without futimes (or equivalent).
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72 If TIMESPEC is null, set the time stamps to the current time.
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73 Return 0 on success, -1 (setting errno) on failure. */
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74
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75 int
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76 futimens (int fd ATTRIBUTE_UNUSED,
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77 char const *file, struct timespec const timespec[2])
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78 {
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79 /* Some Linux-based NFS clients are buggy, and mishandle time stamps
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80 of files in NFS file systems in some cases. We have no
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81 configure-time test for this, but please see
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82 <http://bugs.gentoo.org/show_bug.cgi?id=132673> for references to
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83 some of the problems with Linux 2.6.16. If this affects you,
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84 compile with -DHAVE_BUGGY_NFS_TIME_STAMPS; this is reported to
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85 help in some cases, albeit at a cost in performance. But you
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86 really should upgrade your kernel to a fixed version, since the
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87 problem affects many applications. */
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88
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89 #if HAVE_BUGGY_NFS_TIME_STAMPS
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90 if (fd < 0)
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91 sync ();
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92 else
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93 fsync (fd);
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94 #endif
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95
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96 /* There's currently no interface to set file timestamps with
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97 nanosecond resolution, so do the best we can, discarding any
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98 fractional part of the timestamp. */
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99 #if HAVE_FUTIMESAT || HAVE_WORKING_UTIMES
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100 struct timeval timeval[2];
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101 struct timeval const *t;
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102 if (timespec)
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103 {
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104 timeval[0].tv_sec = timespec[0].tv_sec;
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105 timeval[0].tv_usec = timespec[0].tv_nsec / 1000;
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106 timeval[1].tv_sec = timespec[1].tv_sec;
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107 timeval[1].tv_usec = timespec[1].tv_nsec / 1000;
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108 t = timeval;
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109 }
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110 else
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111 t = NULL;
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112
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113
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114 if (fd < 0)
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115 {
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116 # if HAVE_FUTIMESAT
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117 return futimesat (AT_FDCWD, file, t);
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118 # endif
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119 }
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120 else
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121 {
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122 /* If futimesat or futimes fails here, don't try to speed things
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123 up by returning right away. glibc can incorrectly fail with
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124 errno == ENOENT if /proc isn't mounted. Also, Mandrake 10.0
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125 in high security mode doesn't allow ordinary users to read
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126 /proc/self, so glibc incorrectly fails with errno == EACCES.
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127 If errno == EIO, EPERM, or EROFS, it's probably safe to fail
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128 right away, but these cases are rare enough that they're not
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129 worth optimizing, and who knows what other messed-up systems
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130 are out there? So play it safe and fall back on the code
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131 below. */
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132 # if HAVE_FUTIMESAT
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133 if (futimesat (fd, NULL, t) == 0)
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134 return 0;
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135 # elif HAVE_FUTIMES
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136 if (futimes (fd, t) == 0)
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137 return 0;
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138 # endif
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139 }
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140 #endif
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141
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142 if (!file)
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143 {
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144 #if ! (HAVE_FUTIMESAT || (HAVE_WORKING_UTIMES && HAVE_FUTIMES))
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145 errno = ENOSYS;
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146 #endif
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147
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148 /* Prefer EBADF to ENOSYS if both error numbers apply. */
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149 if (errno == ENOSYS)
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150 {
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151 int fd2 = dup (fd);
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152 int dup_errno = errno;
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153 if (0 <= fd2)
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154 close (fd2);
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155 errno = (fd2 < 0 && dup_errno == EBADF ? EBADF : ENOSYS);
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156 }
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157
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158 return -1;
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159 }
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160
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161 #if HAVE_WORKING_UTIMES
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162 return utimes (file, t);
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163 #else
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164 {
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165 struct utimbuf utimbuf;
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166 struct utimbuf const *ut;
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167 if (timespec)
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168 {
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169 utimbuf.actime = timespec[0].tv_sec;
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170 utimbuf.modtime = timespec[1].tv_sec;
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171 ut = &utimbuf;
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172 }
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173 else
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174 ut = NULL;
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175
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176 return utime (file, ut);
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177 }
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178 #endif
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179 }
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180
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181 /* Set the access and modification time stamps of FILE to be
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182 TIMESPEC[0] and TIMESPEC[1], respectively. */
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183 int
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184 utimens (char const *file, struct timespec const timespec[2])
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185 {
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186 return futimens (-1, file, timespec);
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187 }