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annotate lib/stat-time.h @ 9309:bbbbbf4cd1c5

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Change copyright notice from GPLv2+ to GPLv3+.
author Bruno Haible <bruno@clisp.org>
date Sun, 07 Oct 2007 19:14:58 +0200
parents 71d64e4302fa
children 381eff2df16b
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1 /* stat-related time functions.
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2
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3 Copyright (C) 2005, 2007 Free Software Foundation, Inc.
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5 This program is free software: you can redistribute it and/or modify
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6 it under the terms of the GNU General Public License as published by
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7 the Free Software Foundation; either version 3 of the License, or
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8 (at your option) any 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, see <http://www.gnu.org/licenses/>. */
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18 /* Written by Paul Eggert. */
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20 #ifndef STAT_TIME_H
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21 #define STAT_TIME_H 1
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23 #include <sys/stat.h>
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24 #include <time.h>
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26 /* STAT_TIMESPEC (ST, ST_XTIM) is the ST_XTIM member for *ST of type
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27 struct timespec, if available. If not, then STAT_TIMESPEC_NS (ST,
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28 ST_XTIM) is the nanosecond component of the ST_XTIM member for *ST,
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29 if available. ST_XTIM can be st_atim, st_ctim, st_mtim, or st_birthtim
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30 for access, status change, data modification, or birth (creation)
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31 time respectively.
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32
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33 These macros are private to stat-time.h. */
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34 #if defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC
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35 # ifdef TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC
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36 # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim)
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37 # else
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38 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.tv_nsec)
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39 # endif
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40 #elif defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC
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41 # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim##espec)
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42 #elif defined HAVE_STRUCT_STAT_ST_ATIMENSEC
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43 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim##ensec)
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44 #elif defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC
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45 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec)
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46 #endif
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47
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48 /* Return the nanosecond component of *ST's access time. */
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49 static inline long int
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50 get_stat_atime_ns (struct stat const *st)
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51 {
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52 # if defined STAT_TIMESPEC
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53 return STAT_TIMESPEC (st, st_atim).tv_nsec;
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54 # elif defined STAT_TIMESPEC_NS
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55 return STAT_TIMESPEC_NS (st, st_atim);
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56 # else
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57 return 0;
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58 # endif
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59 }
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60
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61 /* Return the nanosecond component of *ST's status change time. */
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62 static inline long int
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63 get_stat_ctime_ns (struct stat const *st)
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64 {
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65 # if defined STAT_TIMESPEC
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66 return STAT_TIMESPEC (st, st_ctim).tv_nsec;
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67 # elif defined STAT_TIMESPEC_NS
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68 return STAT_TIMESPEC_NS (st, st_ctim);
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69 # else
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70 return 0;
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71 # endif
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72 }
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73
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74 /* Return the nanosecond component of *ST's data modification time. */
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75 static inline long int
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76 get_stat_mtime_ns (struct stat const *st)
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77 {
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78 # if defined STAT_TIMESPEC
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79 return STAT_TIMESPEC (st, st_mtim).tv_nsec;
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80 # elif defined STAT_TIMESPEC_NS
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81 return STAT_TIMESPEC_NS (st, st_mtim);
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82 # else
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83 return 0;
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84 # endif
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85 }
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86
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87 /* Return the nanosecond component of *ST's birth time. */
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88 static inline long int
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89 get_stat_birthtime_ns (struct stat const *st)
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90 {
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91 # if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC
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92 return STAT_TIMESPEC (st, st_birthtim).tv_nsec;
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93 # elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
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94 return STAT_TIMESPEC_NS (st, st_birthtim);
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95 # else
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96 return 0;
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97 # endif
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98 }
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99
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100 /* Return *ST's access time. */
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101 static inline struct timespec
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102 get_stat_atime (struct stat const *st)
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103 {
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104 #ifdef STAT_TIMESPEC
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105 return STAT_TIMESPEC (st, st_atim);
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106 #else
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107 struct timespec t;
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108 t.tv_sec = st->st_atime;
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109 t.tv_nsec = get_stat_atime_ns (st);
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110 return t;
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111 #endif
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112 }
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113
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114 /* Return *ST's status change time. */
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115 static inline struct timespec
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116 get_stat_ctime (struct stat const *st)
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117 {
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118 #ifdef STAT_TIMESPEC
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119 return STAT_TIMESPEC (st, st_ctim);
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120 #else
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121 struct timespec t;
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122 t.tv_sec = st->st_ctime;
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123 t.tv_nsec = get_stat_ctime_ns (st);
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124 return t;
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125 #endif
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126 }
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127
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128 /* Return *ST's data modification time. */
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129 static inline struct timespec
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130 get_stat_mtime (struct stat const *st)
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131 {
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132 #ifdef STAT_TIMESPEC
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133 return STAT_TIMESPEC (st, st_mtim);
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134 #else
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135 struct timespec t;
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136 t.tv_sec = st->st_mtime;
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137 t.tv_nsec = get_stat_mtime_ns (st);
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138 return t;
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139 #endif
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140 }
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141
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142 /* Return *ST's birth time, if available; otherwise return a value
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143 with negative tv_nsec. */
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144 static inline struct timespec
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145 get_stat_birthtime (struct stat const *st)
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146 {
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147 struct timespec t;
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148
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149 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
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150 || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC)
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151 t = STAT_TIMESPEC (st, st_birthtim);
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152 #elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
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153 t.tv_sec = st->st_birthtime;
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154 t.tv_nsec = st->st_birthtimensec;
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155 #elif (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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156 /* Woe32 native platforms (but not Cygwin) put the "file creation
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157 time" in st_ctime (!). See
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158 <http://msdn2.microsoft.com/de-de/library/14h5k7ff(VS.80).aspx>. */
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159 t.tv_sec = st->st_ctime;
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160 t.tv_nsec = 0;
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161 #else
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162 /* Birth time is not supported. Set tv_sec to avoid undefined behavior. */
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163 t.tv_sec = -1;
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164 t.tv_nsec = -1;
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165 #endif
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166
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167 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
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168 || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC \
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169 || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
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170 /* FreeBSD and NetBSD sometimes signal the absence of knowledge by
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171 using zero. Attempt to work around this problem. Alas, this can
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172 report failure even for valid time stamps. Also, NetBSD
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173 sometimes returns junk in the birth time fields; work around this
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174 bug if it it is detected. There's no need to detect negative
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175 tv_nsec junk as negative tv_nsec already indicates an error. */
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176 if (t.tv_sec == 0 || 1000000000 <= t.tv_nsec)
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177 t.tv_nsec = -1;
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178 #endif
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179
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180 return t;
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181 }
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182
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183 #endif