m4/stat-time.m4

   1 # Checks for stat-related time functions.
   2
   3 # Copyright (C) 1998-1999, 2001, 2003, 2005-2007, 2009-2014 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([gl_USE_SYSTEM_EXTENSIONS])
  23   AC_CHECK_HEADERS_ONCE([sys/time.h])
  24
  25   AC_CHECK_MEMBERS([struct stat.st_atim.tv_nsec],
  26     [AC_CACHE_CHECK([whether struct stat.st_atim is of type struct timespec],
  27        [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec],
  28        [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
  29           [[
  30             #include <sys/types.h>
  31             #include <sys/stat.h>
  32             #if HAVE_SYS_TIME_H
  33             # include <sys/time.h>
  34             #endif
  35             #include <time.h>
  36             struct timespec ts;
  37             struct stat st;
  38           ]],
  39           [[
  40             st.st_atim = ts;
  41           ]])],
  42           [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=yes],
  43           [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=no])])
  44      if test $ac_cv_typeof_struct_stat_st_atim_is_struct_timespec = yes; then
  45        AC_DEFINE([TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC], [1],
  46          [Define to 1 if the type of the st_atim member of a struct stat is
  47           struct timespec.])
  48      fi],
  49     [AC_CHECK_MEMBERS([struct stat.st_atimespec.tv_nsec], [],
  50        [AC_CHECK_MEMBERS([struct stat.st_atimensec], [],
  51           [AC_CHECK_MEMBERS([struct stat.st_atim.st__tim.tv_nsec], [], [],
  52              [#include <sys/types.h>
  53               #include <sys/stat.h>])],
  54           [#include <sys/types.h>
  55            #include <sys/stat.h>])],
  56        [#include <sys/types.h>
  57         #include <sys/stat.h>])],
  58     [#include <sys/types.h>
  59      #include <sys/stat.h>])
  60 ])
  61
  62 # Check for st_birthtime, a feature from UFS2 (FreeBSD, NetBSD, OpenBSD, etc.)
  63 # and NTFS (Cygwin).
  64 # There was a time when this field was named st_createtime (21 June
  65 # 2002 to 16 July 2002) But that window is very small and applied only
  66 # to development code, so systems still using that configuration are
  67 # not supported.  See revisions 1.10 and 1.11 of FreeBSD's
  68 # src/sys/ufs/ufs/dinode.h.
  69 #
  70 AC_DEFUN([gl_STAT_BIRTHTIME],
  71 [
  72   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
  73   AC_CHECK_HEADERS_ONCE([sys/time.h])
  74   AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec], [],
  75     [AC_CHECK_MEMBERS([struct stat.st_birthtimensec], [],
  76       [AC_CHECK_MEMBERS([struct stat.st_birthtim.tv_nsec], [], [],
  77          [#include <sys/types.h>
  78           #include <sys/stat.h>])],
  79        [#include <sys/types.h>
  80         #include <sys/stat.h>])],
  81     [#include <sys/types.h>
  82      #include <sys/stat.h>])
  83 ])