1 /* stat-related time functions.
3 Copyright (C) 2005, 2007, 2009-2012 Free Software Foundation, Inc.
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.
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.
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/>. */
18 /* Written by Paul Eggert. */
26 _GL_INLINE_HEADER_BEGIN
28 /* STAT_TIMESPEC (ST, ST_XTIM) is the ST_XTIM member for *ST of type
29 struct timespec, if available. If not, then STAT_TIMESPEC_NS (ST,
30 ST_XTIM) is the nanosecond component of the ST_XTIM member for *ST,
31 if available. ST_XTIM can be st_atim, st_ctim, st_mtim, or st_birthtim
32 for access, status change, data modification, or birth (creation)
35 These macros are private to stat-time.h. */
36 #if defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC
37 # ifdef TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC
38 # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim)
40 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.tv_nsec)
42 #elif defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC
43 # define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim##espec)
44 #elif defined HAVE_STRUCT_STAT_ST_ATIMENSEC
45 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim##ensec)
46 #elif defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC
47 # define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec)
50 #ifndef _GL_STAT_TIME_INLINE
51 # define _GL_STAT_TIME_INLINE _GL_INLINE
54 /* Return the nanosecond component of *ST's access time. */
55 _GL_STAT_TIME_INLINE long int
56 get_stat_atime_ns (struct stat const *st)
58 # if defined STAT_TIMESPEC
59 return STAT_TIMESPEC (st, st_atim).tv_nsec;
60 # elif defined STAT_TIMESPEC_NS
61 return STAT_TIMESPEC_NS (st, st_atim);
67 /* Return the nanosecond component of *ST's status change time. */
68 _GL_STAT_TIME_INLINE long int
69 get_stat_ctime_ns (struct stat const *st)
71 # if defined STAT_TIMESPEC
72 return STAT_TIMESPEC (st, st_ctim).tv_nsec;
73 # elif defined STAT_TIMESPEC_NS
74 return STAT_TIMESPEC_NS (st, st_ctim);
80 /* Return the nanosecond component of *ST's data modification time. */
81 _GL_STAT_TIME_INLINE long int
82 get_stat_mtime_ns (struct stat const *st)
84 # if defined STAT_TIMESPEC
85 return STAT_TIMESPEC (st, st_mtim).tv_nsec;
86 # elif defined STAT_TIMESPEC_NS
87 return STAT_TIMESPEC_NS (st, st_mtim);
93 /* Return the nanosecond component of *ST's birth time. */
94 _GL_STAT_TIME_INLINE long int
95 get_stat_birthtime_ns (struct stat const *st)
97 # if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC
98 return STAT_TIMESPEC (st, st_birthtim).tv_nsec;
99 # elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
100 return STAT_TIMESPEC_NS (st, st_birthtim);
102 /* Avoid a "parameter unused" warning. */
108 /* Return *ST's access time. */
109 _GL_STAT_TIME_INLINE struct timespec
110 get_stat_atime (struct stat const *st)
113 return STAT_TIMESPEC (st, st_atim);
116 t.tv_sec = st->st_atime;
117 t.tv_nsec = get_stat_atime_ns (st);
122 /* Return *ST's status change time. */
123 _GL_STAT_TIME_INLINE struct timespec
124 get_stat_ctime (struct stat const *st)
127 return STAT_TIMESPEC (st, st_ctim);
130 t.tv_sec = st->st_ctime;
131 t.tv_nsec = get_stat_ctime_ns (st);
136 /* Return *ST's data modification time. */
137 _GL_STAT_TIME_INLINE struct timespec
138 get_stat_mtime (struct stat const *st)
141 return STAT_TIMESPEC (st, st_mtim);
144 t.tv_sec = st->st_mtime;
145 t.tv_nsec = get_stat_mtime_ns (st);
150 /* Return *ST's birth time, if available; otherwise return a value
151 with tv_sec and tv_nsec both equal to -1. */
152 _GL_STAT_TIME_INLINE struct timespec
153 get_stat_birthtime (struct stat const *st)
157 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
158 || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC)
159 t = STAT_TIMESPEC (st, st_birthtim);
160 #elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
161 t.tv_sec = st->st_birthtime;
162 t.tv_nsec = st->st_birthtimensec;
163 #elif (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
164 /* Native Windows platforms (but not Cygwin) put the "file creation
165 time" in st_ctime (!). See
166 <http://msdn2.microsoft.com/de-de/library/14h5k7ff(VS.80).aspx>. */
167 t.tv_sec = st->st_ctime;
170 /* Birth time is not supported. */
173 /* Avoid a "parameter unused" warning. */
177 #if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \
178 || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC \
179 || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC)
180 /* FreeBSD and NetBSD sometimes signal the absence of knowledge by
181 using zero. Attempt to work around this problem. Alas, this can
182 report failure even for valid time stamps. Also, NetBSD
183 sometimes returns junk in the birth time fields; work around this
184 bug if it is detected. */
185 if (! (t.tv_sec && 0 <= t.tv_nsec && t.tv_nsec < 1000000000))
195 _GL_INLINE_HEADER_END