1 /* stat-related time functions. 2 3 Copyright (C) 2005, 2007, 2009-2011 Free Software Foundation, Inc. 4 5 This program is free software: you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 /* Written by Paul Eggert. */ 19 20 #ifndef STAT_TIME_H 21 #define STAT_TIME_H 1 22 23 #include <sys/stat.h> 24 #include <time.h> 25 26 /* STAT_TIMESPEC (ST, ST_XTIM) is the ST_XTIM member for *ST of type 27 struct timespec, if available. If not, then STAT_TIMESPEC_NS (ST, 28 ST_XTIM) is the nanosecond component of the ST_XTIM member for *ST, 29 if available. ST_XTIM can be st_atim, st_ctim, st_mtim, or st_birthtim 30 for access, status change, data modification, or birth (creation) 31 time respectively. 32 33 These macros are private to stat-time.h. */ 34 #if defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC 35 # ifdef TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC 36 # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim) 37 # else 38 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.tv_nsec) 39 # endif 40 #elif defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC 41 # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim##espec) 42 #elif defined HAVE_STRUCT_STAT_ST_ATIMENSEC 43 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim##ensec) 44 #elif defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC 45 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec) 46 #endif 47 48 /* Return the nanosecond component of *ST's access time. */ 49 static inline long int 50 get_stat_atime_ns (struct stat const *st) 51 { 52 # if defined STAT_TIMESPEC 53 return STAT_TIMESPEC (st, st_atim).tv_nsec; 54 # elif defined STAT_TIMESPEC_NS 55 return STAT_TIMESPEC_NS (st, st_atim); 56 # else 57 return 0; 58 # endif 59 } 60 61 /* Return the nanosecond component of *ST's status change time. */ 62 static inline long int 63 get_stat_ctime_ns (struct stat const *st) 64 { 65 # if defined STAT_TIMESPEC 66 return STAT_TIMESPEC (st, st_ctim).tv_nsec; 67 # elif defined STAT_TIMESPEC_NS 68 return STAT_TIMESPEC_NS (st, st_ctim); 69 # else 70 return 0; 71 # endif 72 } 73 74 /* Return the nanosecond component of *ST's data modification time. */ 75 static inline long int 76 get_stat_mtime_ns (struct stat const *st) 77 { 78 # if defined STAT_TIMESPEC 79 return STAT_TIMESPEC (st, st_mtim).tv_nsec; 80 # elif defined STAT_TIMESPEC_NS 81 return STAT_TIMESPEC_NS (st, st_mtim); 82 # else 83 return 0; 84 # endif 85 } 86 87 /* Return the nanosecond component of *ST's birth time. */ 88 static inline long int 89 get_stat_birthtime_ns (struct stat const *st) 90 { 91 # if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC 92 return STAT_TIMESPEC (st, st_birthtim).tv_nsec; 93 # elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC 94 return STAT_TIMESPEC_NS (st, st_birthtim); 95 # else 96 /* Avoid a "parameter unused" warning. */ 97 (void) st; 98 return 0; 99 # endif 100 } 101 102 /* Return *ST's access time. */ 103 static inline struct timespec 104 get_stat_atime (struct stat const *st) 105 { 106 #ifdef STAT_TIMESPEC 107 return STAT_TIMESPEC (st, st_atim); 108 #else 109 struct timespec t; 110 t.tv_sec = st->st_atime; 111 t.tv_nsec = get_stat_atime_ns (st); 112 return t; 113 #endif 114 } 115 116 /* Return *ST's status change time. */ 117 static inline struct timespec 118 get_stat_ctime (struct stat const *st) 119 { 120 #ifdef STAT_TIMESPEC 121 return STAT_TIMESPEC (st, st_ctim); 122 #else 123 struct timespec t; 124 t.tv_sec = st->st_ctime; 125 t.tv_nsec = get_stat_ctime_ns (st); 126 return t; 127 #endif 128 } 129 130 /* Return *ST's data modification time. */ 131 static inline struct timespec 132 get_stat_mtime (struct stat const *st) 133 { 134 #ifdef STAT_TIMESPEC 135 return STAT_TIMESPEC (st, st_mtim); 136 #else 137 struct timespec t; 138 t.tv_sec = st->st_mtime; 139 t.tv_nsec = get_stat_mtime_ns (st); 140 return t; 141 #endif 142 } 143 144 /* Return *ST's birth time, if available; otherwise return a value 145 with tv_sec and tv_nsec both equal to -1. */ 146 static inline struct timespec 147 get_stat_birthtime (struct stat const *st) 148 { 149 struct timespec t; 150 151 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \ 152 || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC) 153 t = STAT_TIMESPEC (st, st_birthtim); 154 #elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC 155 t.tv_sec = st->st_birthtime; 156 t.tv_nsec = st->st_birthtimensec; 157 #elif (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ 158 /* Woe32 native platforms (but not Cygwin) put the "file creation 159 time" in st_ctime (!). See 160 <http://msdn2.microsoft.com/de-de/library/14h5k7ff(VS.80).aspx>. */ 161 t.tv_sec = st->st_ctime; 162 t.tv_nsec = 0; 163 #else 164 /* Birth time is not supported. */ 165 t.tv_sec = -1; 166 t.tv_nsec = -1; 167 /* Avoid a "parameter unused" warning. */ 168 (void) st; 169 #endif 170 171 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \ 172 || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC \ 173 || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC) 174 /* FreeBSD and NetBSD sometimes signal the absence of knowledge by 175 using zero. Attempt to work around this problem. Alas, this can 176 report failure even for valid time stamps. Also, NetBSD 177 sometimes returns junk in the birth time fields; work around this 178 bug if it is detected. */ 179 if (! (t.tv_sec && 0 <= t.tv_nsec && t.tv_nsec < 1000000000)) 180 { 181 t.tv_sec = -1; 182 t.tv_nsec = -1; 183 } 184 #endif 185 186 return t; 187 } 188 189 #endif 190