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annotate lib/stat-time.h @ 17028:ce2683fe3994

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Keep the extern-inline macros closer together.
author Paul Eggert <eggert@cs.ucla.edu>
date Wed, 01 Aug 2012 14:30:54 -0700
parents fc49ecfa5827
children e542fd46ad6f
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1 /* stat-related time functions.
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2
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3 Copyright (C) 2005, 2007, 2009-2012 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
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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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22
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23 #include <sys/stat.h>
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24 #include <time.h>
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25
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26 _GL_INLINE_HEADER_BEGIN
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27 #ifndef _GL_STAT_TIME_INLINE
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28 # define _GL_STAT_TIME_INLINE _GL_INLINE
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29 #endif
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30
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31 /* STAT_TIMESPEC (ST, ST_XTIM) is the ST_XTIM member for *ST of type
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32 struct timespec, if available. If not, then STAT_TIMESPEC_NS (ST,
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33 ST_XTIM) is the nanosecond component of the ST_XTIM member for *ST,
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34 if available. ST_XTIM can be st_atim, st_ctim, st_mtim, or st_birthtim
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35 for access, status change, data modification, or birth (creation)
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36 time respectively.
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37
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38 These macros are private to stat-time.h. */
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39 #if defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC
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40 # ifdef TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC
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41 # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim)
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42 # else
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43 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.tv_nsec)
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44 # endif
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45 #elif defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC
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46 # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim##espec)
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47 #elif defined HAVE_STRUCT_STAT_ST_ATIMENSEC
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48 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim##ensec)
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49 #elif defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC
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50 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec)
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51 #endif
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52
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53 /* Return the nanosecond component of *ST's access time. */
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54 _GL_STAT_TIME_INLINE long int
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55 get_stat_atime_ns (struct stat const *st)
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56 {
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57 # if defined STAT_TIMESPEC
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58 return STAT_TIMESPEC (st, st_atim).tv_nsec;
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59 # elif defined STAT_TIMESPEC_NS
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60 return STAT_TIMESPEC_NS (st, st_atim);
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61 # else
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62 return 0;
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63 # endif
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64 }
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65
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66 /* Return the nanosecond component of *ST's status change time. */
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67 _GL_STAT_TIME_INLINE long int
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68 get_stat_ctime_ns (struct stat const *st)
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69 {
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70 # if defined STAT_TIMESPEC
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71 return STAT_TIMESPEC (st, st_ctim).tv_nsec;
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72 # elif defined STAT_TIMESPEC_NS
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73 return STAT_TIMESPEC_NS (st, st_ctim);
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74 # else
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75 return 0;
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76 # endif
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77 }
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78
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79 /* Return the nanosecond component of *ST's data modification time. */
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80 _GL_STAT_TIME_INLINE long int
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81 get_stat_mtime_ns (struct stat const *st)
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82 {
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83 # if defined STAT_TIMESPEC
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84 return STAT_TIMESPEC (st, st_mtim).tv_nsec;
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85 # elif defined STAT_TIMESPEC_NS
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86 return STAT_TIMESPEC_NS (st, st_mtim);
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87 # else
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88 return 0;
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89 # endif
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90 }
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91
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92 /* Return the nanosecond component of *ST's birth time. */
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93 _GL_STAT_TIME_INLINE long int
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94 get_stat_birthtime_ns (struct stat const *st)
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95 {
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96 # if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC
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97 return STAT_TIMESPEC (st, st_birthtim).tv_nsec;
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98 # elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
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99 return STAT_TIMESPEC_NS (st, st_birthtim);
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100 # else
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101 /* Avoid a "parameter unused" warning. */
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102 (void) st;
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103 return 0;
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104 # endif
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105 }
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106
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107 /* Return *ST's access time. */
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108 _GL_STAT_TIME_INLINE struct timespec
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109 get_stat_atime (struct stat const *st)
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110 {
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111 #ifdef STAT_TIMESPEC
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112 return STAT_TIMESPEC (st, st_atim);
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113 #else
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114 struct timespec t;
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115 t.tv_sec = st->st_atime;
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116 t.tv_nsec = get_stat_atime_ns (st);
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117 return t;
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118 #endif
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119 }
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120
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121 /* Return *ST's status change time. */
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122 _GL_STAT_TIME_INLINE struct timespec
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123 get_stat_ctime (struct stat const *st)
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124 {
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125 #ifdef STAT_TIMESPEC
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126 return STAT_TIMESPEC (st, st_ctim);
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127 #else
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128 struct timespec t;
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129 t.tv_sec = st->st_ctime;
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130 t.tv_nsec = get_stat_ctime_ns (st);
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131 return t;
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132 #endif
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133 }
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134
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135 /* Return *ST's data modification time. */
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136 _GL_STAT_TIME_INLINE struct timespec
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137 get_stat_mtime (struct stat const *st)
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138 {
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139 #ifdef STAT_TIMESPEC
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140 return STAT_TIMESPEC (st, st_mtim);
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141 #else
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142 struct timespec t;
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143 t.tv_sec = st->st_mtime;
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144 t.tv_nsec = get_stat_mtime_ns (st);
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145 return t;
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146 #endif
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147 }
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148
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149 /* Return *ST's birth time, if available; otherwise return a value
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150 with tv_sec and tv_nsec both equal to -1. */
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151 _GL_STAT_TIME_INLINE struct timespec
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152 get_stat_birthtime (struct stat const *st)
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153 {
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154 struct timespec t;
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155
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156 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
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157 || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC)
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158 t = STAT_TIMESPEC (st, st_birthtim);
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159 #elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
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160 t.tv_sec = st->st_birthtime;
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161 t.tv_nsec = st->st_birthtimensec;
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162 #elif (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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163 /* Native Windows platforms (but not Cygwin) put the "file creation
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164 time" in st_ctime (!). See
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165 <http://msdn2.microsoft.com/de-de/library/14h5k7ff(VS.80).aspx>. */
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166 t.tv_sec = st->st_ctime;
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167 t.tv_nsec = 0;
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168 #else
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169 /* Birth time is not supported. */
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170 t.tv_sec = -1;
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171 t.tv_nsec = -1;
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172 /* Avoid a "parameter unused" warning. */
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173 (void) st;
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174 #endif
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175
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176 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
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177 || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC \
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178 || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
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179 /* FreeBSD and NetBSD sometimes signal the absence of knowledge by
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180 using zero. Attempt to work around this problem. Alas, this can
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181 report failure even for valid time stamps. Also, NetBSD
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182 sometimes returns junk in the birth time fields; work around this
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183 bug if it is detected. */
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184 if (! (t.tv_sec && 0 <= t.tv_nsec && t.tv_nsec < 1000000000))
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185 {
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186 t.tv_sec = -1;
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187 t.tv_nsec = -1;
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188 }
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189 #endif
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190
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191 return t;
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192 }
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193
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194 _GL_INLINE_HEADER_END
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195
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196 #endif