m4/stat-time.m4

   1 # Checks for stat-related time functions.
   2
   3 # Copyright (C) 1998-1999, 2001, 2003, 2005-2007, 2009-2012 Free Software
   4 # Foundation, Inc.
   5
   6 # This file is free software; the Free Software Foundation
   7 # gives unlimited permission to copy and/or distribute it,
   8 # with or without modifications, as long as this notice is preserved.
   9
  10 dnl From Paul Eggert.
  11
  12 # st_atim.tv_nsec - Linux, Solaris, Cygwin
  13 # st_atimespec.tv_nsec - FreeBSD, NetBSD, if ! defined _POSIX_SOURCE
  14 # st_atimensec - FreeBSD, NetBSD, if defined _POSIX_SOURCE
  15 # st_atim.st__tim.tv_nsec - UnixWare (at least 2.1.2 through 7.1)
  16
  17 # st_birthtimespec - FreeBSD, NetBSD (hidden on OpenBSD 3.9, anyway)
  18 # st_birthtim - Cygwin 1.7.0+
  19
  20 AC_DEFUN([gl_STAT_TIME],
  21 [
  22   AC_REQUIRE([AC_C_INLINE])
  23   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  24   AC_CHECK_HEADERS_ONCE([sys/time.h])
  25
  26   AC_CHECK_MEMBERS([struct stat.st_atim.tv_nsec],
  27     [AC_CACHE_CHECK([whether struct stat.st_atim is of type struct timespec],
  28        [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec],
  29        [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
  30           [[
  31             #include <sys/types.h>
  32             #include <sys/stat.h>
  33             #if HAVE_SYS_TIME_H
  34             # include <sys/time.h>
  35             #endif
  36             #include <time.h>
  37             struct timespec ts;
  38             struct stat st;
  39           ]],
  40           [[
  41             st.st_atim = ts;
  42           ]])],
  43           [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=yes],
  44           [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=no])])
  45      if test $ac_cv_typeof_struct_stat_st_atim_is_struct_timespec = yes; then
  46        AC_DEFINE([TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC], [1],
  47          [Define to 1 if the type of the st_atim member of a struct stat is
  48           struct timespec.])
  49      fi],
  50     [AC_CHECK_MEMBERS([struct stat.st_atimespec.tv_nsec], [],
  51        [AC_CHECK_MEMBERS([struct stat.st_atimensec], [],
  52           [AC_CHECK_MEMBERS([struct stat.st_atim.st__tim.tv_nsec], [], [],
  53              [#include <sys/types.h>
  54               #include <sys/stat.h>])],
  55           [#include <sys/types.h>
  56            #include <sys/stat.h>])],
  57        [#include <sys/types.h>
  58         #include <sys/stat.h>])],
  59     [#include <sys/types.h>
  60      #include <sys/stat.h>])
  61 ])
  62
  63 # Check for st_birthtime, a feature from UFS2 (FreeBSD, NetBSD, OpenBSD, etc.)
  64 # and NTFS (Cygwin).
  65 # There was a time when this field was named st_createtime (21 June
  66 # 2002 to 16 July 2002) But that window is very small and applied only
  67 # to development code, so systems still using that configuration are
  68 # not supported.  See revisions 1.10 and 1.11 of FreeBSD's
  69 # src/sys/ufs/ufs/dinode.h.
  70 #
  71 AC_DEFUN([gl_STAT_BIRTHTIME],
  72 [
  73   AC_REQUIRE([AC_C_INLINE])
  74   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  75   AC_CHECK_HEADERS_ONCE([sys/time.h])
  76   AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec], [],
  77     [AC_CHECK_MEMBERS([struct stat.st_birthtimensec], [],
  78       [AC_CHECK_MEMBERS([struct stat.st_birthtim.tv_nsec], [], [],
  79          [#include <sys/types.h>
  80           #include <sys/stat.h>])],
  81        [#include <sys/types.h>
  82         #include <sys/stat.h>])],
  83     [#include <sys/types.h>
  84      #include <sys/stat.h>])
  85 ])