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Diffstat (limited to 'lib/stat-time.h')
| -rw-r--r-- | lib/stat-time.h | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/lib/stat-time.h b/lib/stat-time.h new file mode 100644 index 0000000..649c848 --- /dev/null +++ b/lib/stat-time.h @@ -0,0 +1,184 @@ +/* stat-related time functions. + + Copyright (C) 2005, 2007 Free Software Foundation, Inc. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software Foundation, + Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ + +/* Written by Paul Eggert. */ + +#ifndef STAT_TIME_H +#define STAT_TIME_H 1 + +#include <sys/stat.h> +#include <time.h> + +/* STAT_TIMESPEC (ST, ST_XTIM) is the ST_XTIM member for *ST of type + struct timespec, if available. If not, then STAT_TIMESPEC_NS (ST, + ST_XTIM) is the nanosecond component of the ST_XTIM member for *ST, + if available. ST_XTIM can be st_atim, st_ctim, st_mtim, or st_birthtim + for access, status change, data modification, or birth (creation) + time respectively. + + These macros are private to stat-time.h. */ +#if defined HAVE_STRUCT_STAT_ST_ATIM_TV_NSEC +# ifdef TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC +# define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim) +# else +# define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.tv_nsec) +# endif +#elif defined HAVE_STRUCT_STAT_ST_ATIMESPEC_TV_NSEC +# define STAT_TIMESPEC(st, st_xtim) ((st)->st_xtim##espec) +#elif defined HAVE_STRUCT_STAT_ST_ATIMENSEC +# define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim##ensec) +#elif defined HAVE_STRUCT_STAT_ST_ATIM_ST__TIM_TV_NSEC +# define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec) +#endif + +/* Return the nanosecond component of *ST's access time. */ +static inline long int +get_stat_atime_ns (struct stat const *st) +{ +# if defined STAT_TIMESPEC + return STAT_TIMESPEC (st, st_atim).tv_nsec; +# elif defined STAT_TIMESPEC_NS + return STAT_TIMESPEC_NS (st, st_atim); +# else + return 0; +# endif +} + +/* Return the nanosecond component of *ST's status change time. */ +static inline long int +get_stat_ctime_ns (struct stat const *st) +{ +# if defined STAT_TIMESPEC + return STAT_TIMESPEC (st, st_ctim).tv_nsec; +# elif defined STAT_TIMESPEC_NS + return STAT_TIMESPEC_NS (st, st_ctim); +# else + return 0; +# endif +} + +/* Return the nanosecond component of *ST's data modification time. */ +static inline long int +get_stat_mtime_ns (struct stat const *st) +{ +# if defined STAT_TIMESPEC + return STAT_TIMESPEC (st, st_mtim).tv_nsec; +# elif defined STAT_TIMESPEC_NS + return STAT_TIMESPEC_NS (st, st_mtim); +# else + return 0; +# endif +} + +/* Return the nanosecond component of *ST's birth time. */ +static inline long int +get_stat_birthtime_ns (struct stat const *st) +{ +# if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC + return STAT_TIMESPEC (st, st_birthtim).tv_nsec; +# elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC + return STAT_TIMESPEC_NS (st, st_birthtim); +# else + return 0; +# endif +} + +/* Return *ST's access time. */ +static inline struct timespec +get_stat_atime (struct stat const *st) +{ +#ifdef STAT_TIMESPEC + return STAT_TIMESPEC (st, st_atim); +#else + struct timespec t; + t.tv_sec = st->st_atime; + t.tv_nsec = get_stat_atime_ns (st); + return t; +#endif +} + +/* Return *ST's status change time. */ +static inline struct timespec +get_stat_ctime (struct stat const *st) +{ +#ifdef STAT_TIMESPEC + return STAT_TIMESPEC (st, st_ctim); +#else + struct timespec t; + t.tv_sec = st->st_ctime; + t.tv_nsec = get_stat_ctime_ns (st); + return t; +#endif +} + +/* Return *ST's data modification time. */ +static inline struct timespec +get_stat_mtime (struct stat const *st) +{ +#ifdef STAT_TIMESPEC + return STAT_TIMESPEC (st, st_mtim); +#else + struct timespec t; + t.tv_sec = st->st_mtime; + t.tv_nsec = get_stat_mtime_ns (st); + return t; +#endif +} + +/* Return *ST's birth time, if available; otherwise return a value + with negative tv_nsec. */ +static inline struct timespec +get_stat_birthtime (struct stat const *st) +{ + struct timespec t; + +#if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \ + || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC) + t = STAT_TIMESPEC (st, st_birthtim); +#elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC + t.tv_sec = st->st_birthtime; + t.tv_nsec = st->st_birthtimensec; +#elif (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ + /* Woe32 native platforms (but not Cygwin) put the "file creation + time" in st_ctime (!). See + <http://msdn2.microsoft.com/de-de/library/14h5k7ff(VS.80).aspx>. */ + t.tv_sec = st->st_ctime; + t.tv_nsec = 0; +#else + /* Birth time is not supported. Set tv_sec to avoid undefined behavior. */ + t.tv_sec = -1; + t.tv_nsec = -1; +#endif + +#if (defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC \ + || defined HAVE_STRUCT_STAT_ST_BIRTHTIM_TV_NSEC \ + || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC) + /* FreeBSD and NetBSD sometimes signal the absence of knowledge by + using zero. Attempt to work around this problem. Alas, this can + report failure even for valid time stamps. Also, NetBSD + sometimes returns junk in the birth time fields; work around this + bug if it it is detected. There's no need to detect negative + tv_nsec junk as negative tv_nsec already indicates an error. */ + if (t.tv_sec == 0 || 1000000000 <= t.tv_nsec) + t.tv_nsec = -1; +#endif + + return t; +} + +#endif |