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authorBruno Haible <bruno@clisp.org>2017-05-13 02:51:05 +0200
committerBruno Haible <bruno@clisp.org>2017-05-13 02:51:54 +0200
commit7d2f35f7f976cc29baf22fd0d4d1d58fc870ce64 (patch)
tree5dc742225bf9ac0b554ff0dbd64e6ced0ea748ef /doc/windows-stat-timespec.texi
parent44fe2082cf3e604bf0b4fe7259d1edb7cce334da (diff)
downloadgnulib-7d2f35f7f976cc29baf22fd0d4d1d58fc870ce64.tar.gz
windows-stat-timespec: New module.
* modules/windows-stat-timespec: New file. * m4/windows-stat-timespec.m4: New file. * m4/sys_stat_h.m4 (gl_HEADER_SYS_STAT_H): Set WINDOWS_STAT_TIMESPEC. * modules/sys_stat (Makefile.am): Substitute WINDOWS_STAT_TIMESPEC. * lib/sys_stat.in.h (struct stat) [WINDOWS_STAT_TIMESPEC]: Declare with fields st_atim, st_mtim, st_ctim. (st_atime, st_mtime, st_ctime): Define as macros. (_GL_WINDOWS_STAT_TIMESPEC): New macro. * lib/stat-w32.h (_gl_convert_FILETIME_to_timespec) [_GL_WINDOWS_STAT_TIMESPEC]: New declaration. * lib/stat-w32.c (_gl_convert_FILETIME_to_timespec) [_GL_WINDOWS_STAT_TIMESPEC]: New function. (_gl_convert_FILETIME_to_POSIX): Adjust coding style. (_gl_fstat_by_handle): If _GL_WINDOWS_STAT_TIMESPEC, convert the FILETIME to 'struct timespec', not 'time_t'. * lib/stat.c (rpl_stat): If _GL_WINDOWS_STAT_TIMESPEC, convert the FILETIME to 'struct timespec', not 'time_t'. * lib/stat-time.h (STAT_TIMESPEC): Define also if _GL_WINDOWS_STAT_TIMESPEC. * doc/windows-stat-timespec.texi: New file. * doc/gnulib.texi: Include it.
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+@node Precise file timestamps on Windows
+@section Precise file timestamps on Windows
+
+The module @samp{windows-stat-timespec} ensures that,
+on native Windows platforms, @code{struct stat} contains
+@code{st_atim}, @code{st_mtim}, @code{st_ctim} fields of type
+@code{struct timespec}, providing 100 ns resolution for the timestamps
+of files.
+
+Note: On some types of file systems, the timestamp resolution is limited
+by the file system. For example, on FAT file systems, @code{st_mtim}
+only has a resolution of 2 seconds. For more details, see
+@url{https://msdn.microsoft.com/en-us/library/ms724290.aspx}.