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annotate m4/stat-time.m4 @ 8568:392970b32717

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Support sub-second birthtime on cygwin. * m4/stat-time.m4 (gl_STAT_BIRTHTIME): Also check for st_birthtim. * lib/stat-time.h (STAT_TIMESPEC): Adjust comments. (get_stat_birthtime): Also work with st_birthtim.
author Eric Blake <ebb9@byu.net>
date Tue, 27 Mar 2007 20:03:47 +0000
parents f7fc3652bfc5
children f6cba5a556ce
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1 # Checks for stat-related time functions.
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2
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3 # Copyright (C) 1998, 1999, 2001, 2003, 2005, 2006, 2007 Free Software
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4 # Foundation, Inc.
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5
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6 # This file is free software; the Free Software Foundation
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7 # gives unlimited permission to copy and/or distribute it,
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8 # with or without modifications, as long as this notice is preserved.
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9
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10 dnl From Paul Eggert.
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11
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12 # st_atim.tv_nsec - Linux, Solaris, Cygwin
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13 # st_atimespec.tv_nsec - FreeBSD, NetBSD, if ! defined _POSIX_SOURCE
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14 # st_atimensec - FreeBSD, NetBSD, if defined _POSIX_SOURCE
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15 # st_atim.st__tim.tv_nsec - UnixWare (at least 2.1.2 through 7.1)
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16
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17 # st_birthtimespec - FreeBSD, NetBSD (hidden on OpenBSD 3.9, anyway)
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18 # st_birthtim - Cygwin 1.7.0+
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20 AC_DEFUN([gl_STAT_TIME],
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21 [
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22 AC_REQUIRE([AC_C_INLINE])
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23 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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24 AC_CHECK_HEADERS_ONCE([sys/time.h])
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26 AC_CHECK_MEMBERS([struct stat.st_atim.tv_nsec],
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27 [AC_CACHE_CHECK([whether struct stat.st_atim is of type struct timespec],
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28 [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec],
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29 [AC_TRY_COMPILE(
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30 [
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31 #include <sys/types.h>
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32 #include <sys/stat.h>
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33 #if HAVE_SYS_TIME_H
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34 # include <sys/time.h>
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35 #endif
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36 #include <time.h>
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37 struct timespec ts;
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38 struct stat st;
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39 ],
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40 [
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41 st.st_atim = ts;
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42 ],
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43 [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=yes],
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44 [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=no])])
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45 if test $ac_cv_typeof_struct_stat_st_atim_is_struct_timespec = yes; then
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46 AC_DEFINE([TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC], 1,
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47 [Define to 1 if the type of the st_atim member of a struct stat is
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48 struct timespec.])
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49 fi],
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50 [AC_CHECK_MEMBERS([struct stat.st_atimespec.tv_nsec], [],
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51 [AC_CHECK_MEMBERS([struct stat.st_atimensec], [],
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52 [AC_CHECK_MEMBERS([struct stat.st_atim.st__tim.tv_nsec], [], [],
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53 [#include <sys/types.h>
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54 #include <sys/stat.h>])],
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55 [#include <sys/types.h>
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56 #include <sys/stat.h>])],
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57 [#include <sys/types.h>
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58 #include <sys/stat.h>])],
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59 [#include <sys/types.h>
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60 #include <sys/stat.h>])
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61 ])
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62
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63 # Check for st_birthtime, a feature from UFS2 (FreeBSD, NetBSD, OpenBSD, etc.)
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64 # and NTFS (Cygwin).
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65 # There was a time when this field was named st_createtime (21 June
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66 # 2002 to 16 July 2002) But that window is very small and applied only
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67 # to development code, so systems still using that configuration are
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68 # not supported. See revisions 1.10 and 1.11 of FreeBSD's
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69 # src/sys/ufs/ufs/dinode.h.
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70 #
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71 AC_DEFUN([gl_STAT_BIRTHTIME],
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72 [
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73 AC_REQUIRE([AC_C_INLINE])
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74 AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
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75 AC_CHECK_HEADERS_ONCE([sys/time.h])
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76 AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec], [],
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77 [AC_CHECK_MEMBERS([struct stat.st_birthtimensec], [],
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78 [AC_CHECK_MEMBERS([struct stat.st_birthtim.tv_nsec], [], [],
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79 [#include <sys/types.h>
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80 #include <sys/stat.h>])],
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81 [#include <sys/types.h>
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82 #include <sys/stat.h>])],
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83 [#include <sys/types.h>
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84 #include <sys/stat.h>])
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85 ])