# define STAT_TIMESPEC_NS(st, st_xtim) ((st)->st_xtim.st__tim.tv_nsec)
#endif
-#if defined HAVE_STRUCT_STAT_ST_BIRTHTIME || defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC || defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC || defined HAVE_STRUCT_STAT_ST_SPARE4
-# define USE_BIRTHTIME 1
-#else
-# undef USE_BIRTHTIME
-#endif
-
-
/* Return the nanosecond component of *ST's access time. */
static inline long int
get_stat_atime_ns (struct stat const *st)
return STAT_TIMESPEC (st, st_atim).tv_nsec;
# elif defined STAT_TIMESPEC_NS
return STAT_TIMESPEC_NS (st, st_atim);
-# elif defined HAVE_STRUCT_STAT_ST_SPARE1
- return st->st_spare1 * 1000;
# else
return 0;
# endif
return STAT_TIMESPEC (st, st_ctim).tv_nsec;
# elif defined STAT_TIMESPEC_NS
return STAT_TIMESPEC_NS (st, st_ctim);
-# elif defined HAVE_STRUCT_STAT_ST_SPARE1
- return st->st_spare3 * 1000;
# else
return 0;
# endif
return STAT_TIMESPEC (st, st_mtim).tv_nsec;
# elif defined STAT_TIMESPEC_NS
return STAT_TIMESPEC_NS (st, st_mtim);
-# elif defined HAVE_STRUCT_STAT_ST_SPARE1
- return st->st_spare2 * 1000;
# else
return 0;
# endif
static inline long int
get_stat_birthtime_ns (struct stat const *st)
{
-# if defined USE_BIRTHTIME
-# if defined STAT_TIMESPEC && defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC
+# if defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_NSEC
return STAT_TIMESPEC (st, st_birthtim).tv_nsec;
-# elif defined STAT_TIMESPEC_NS && defined HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_TV_SEC
+# elif defined HAVE_STRUCT_STAT_ST_BIRTHTIMENSEC
return STAT_TIMESPEC_NS (st, st_birthtim);
-# elif defined HAVE_STRUCT_STAT_ST_SPARE4
- /* Cygwin, without __CYGWIN_USE_BIG_TYPES__ */
- return st->st_spare4[1] * 1000L;
-# else
- /* Birthtime is available, but not at nanosecond resolution. */
- return 0;
-# endif
# else
- /* Birthtime is not available, so indicate this in the returned value. */
return 0;
-# endif
+# endif
}
/* Return *ST's access time. */
#endif
}
-/* Return *ST's birth time, if available, in *PTS. A nonzero value is
- * returned if the stat structure appears to indicate that the
- * timestamp is available.
- *
- * The return value of this function does not reliably indicate that the
- * returned data is valid; see the comments within the body of the
- * function for an explanation.
- */
-static inline int
-get_stat_birthtime (struct stat const *st,
- struct timespec *pts)
+/* 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)
{
-#if defined USE_BIRTHTIME
-# ifdef STAT_TIMESPEC
- *pts = STAT_TIMESPEC (st, st_birthtim);
-# else
struct timespec t;
- pts->tv_sec = st->st_birthtime;
- pts->tv_nsec = get_stat_birthtime_ns (st);
-# endif
- /* NetBSD sometimes signals the absence of knowledge of the file's
- * birth time by using zero. We indicate we don't know, by
- * returning 0 from this function when that happens. This is
- * slightly problematic since (time_t)0 is otherwise a valid, albeit
- * unlikely, timestamp.
- *
- * NetBSD sometimes returns 0 for unknown values (for example on
- * ffs) and sometimes begative values for tv_nsec (for example on
- * NFS). For some filesystems (e.g. msdos) NetBSD also appears to
- * fail to update the st_birthtime member at all, and just leaves in
- * there whatever junk existed int he uninitialised stat structure
- * the caller provided. Therefore, callers are advised to initialise
- * the tv_nsec number to a negative value before they call stat in
- * order to detect this problem.
- */
- if (pts->tv_sec == (time_t)0)
- {
- return 0; /* result probably invalid, see above. */
- }
- else
- {
- /* Sometimes NetBSD returns junk in the birth time fields, so
- * do a simple range check on the data, and return 0 to indicate
- * that the data is invalid if it just looks wrong.
- */
- return (pts->tv_nsec >= 0) && (pts->tv_nsec <= 1000000000);
- }
-#elif (defined _WIN32 || defined __WIN32__) && !defined __CYGWIN__
- /* Woe32 native platforms (mingw, msvc, but not Cygwin) put the
- * "file creation time" in st_ctime (!). See for example the
- * article
- * <http://msdn2.microsoft.com/de-de/library/14h5k7ff(VS.80).aspx>
- */
- pts->tv_sec = st->st_ctime;
- pts->tv_nsec = 0;
- return 1; /* result is valid */
+#ifdef HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC_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;
+
+ /* NetBSD sometimes signals the absence of knowledge by using zero.
+ Attempt to work around this bug. This sometimes reports failure
+ even for valid time stamps. Also, sometimes NetBSD 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;
+
+#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 not supported. */
- pts->tv_sec = 0;
- pts->tv_nsec = 0;
- return 0; /* result is not valid */
+ /* Birth time is not supported. Set tv_sec to avoid undefined behavior. */
+ t.tv_sec = -1;
+ t.tv_nsec = -1;
#endif
+
+ return t;
}
#endif
# st_atimespec.tv_nsec - FreeBSD, NetBSD, if ! defined _POSIX_SOURCE
# st_atimensec - FreeBSD, NetBSD, if defined _POSIX_SOURCE
# st_atim.st__tim.tv_nsec - UnixWare (at least 2.1.2 through 7.1)
-# st_spare1 - Cygwin?
-# st_birthtimespec present on NetBSD (probably also FreBSD, OpenBSD)
+# st_birthtimespec - FreeBSD, NetBSD (hidden on OpenBSD 3.9, anyway)
AC_DEFUN([gl_STAT_TIME],
[
fi],
[AC_CHECK_MEMBERS([struct stat.st_atimespec.tv_nsec], [],
[AC_CHECK_MEMBERS([struct stat.st_atimensec], [],
- [AC_CHECK_MEMBERS([struct stat.st_atim.st__tim.tv_nsec], [],
- [AC_CHECK_MEMBERS([struct stat.st_spare1], [],
- [],
- [#include <sys/types.h>
- #include <sys/stat.h>])],
+ [AC_CHECK_MEMBERS([struct stat.st_atim.st__tim.tv_nsec], [], [],
[#include <sys/types.h>
#include <sys/stat.h>])],
[#include <sys/types.h>
#include <sys/stat.h>])
])
-# Checks for st_birthtime, which is a feature from UFS2 (FreeBSD, NetBSD, OpenBSD, etc.)
-# There was a time when this field was named st_createtime (21 June 2002 to 16 July 2002)
-# But that window is very small and applied only to development code, so systems still
-# using that configuration are not a realistic development target.
-# See revisions 1.10 and 1.11 of FreeBSD's src/sys/ufs/ufs/dinode.h.
+# Check for st_birthtime, a feature from UFS2 (FreeBSD, NetBSD, OpenBSD, etc.).
+# There was a time when this field was named st_createtime (21 June
+# 2002 to 16 July 2002) But that window is very small and applied only
+# to development code, so systems still using that configuration are
+# not supported. See revisions 1.10 and 1.11 of FreeBSD's
+# src/sys/ufs/ufs/dinode.h.
#
AC_DEFUN([gl_STAT_BIRTHTIME],
[
AC_REQUIRE([AC_C_INLINE])
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_CHECK_HEADERS_ONCE([sys/time.h])
- AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_sec, struct stat.st_birthtimespec.tv_nsec], [],
- [AC_CHECK_MEMBERS([struct stat.st_birthtime, struct stat.st_birthtimensec], [],
- [AC_CHECK_MEMBERS([struct stat.st_spare4], [],
- [],
- [#include <sys/types.h>
- #include <sys/stat.h>])],
+ AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec], [],
+ [AC_CHECK_MEMBERS([struct stat.st_birthtimensec], [], [],
[#include <sys/types.h>
#include <sys/stat.h>])],
[#include <sys/types.h>
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