# Checks for stat-related time functions.

# Copyright (C) 1998-1999, 2001, 2003, 2005-2007, 2009-2020 Free Software

# Foundation, Inc.

# This file is free software; the Free Software Foundation

# gives unlimited permission to copy and/or distribute it,

# with or without modifications, as long as this notice is preserved.

dnl From Paul Eggert.

# st_atim.tv_nsec - Linux, Solaris, Cygwin

# 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_birthtimespec - FreeBSD, NetBSD (hidden on OpenBSD 3.9, anyway)

# st_birthtim - Cygwin 1.7.0+

AC_DEFUN([gl_STAT_TIME],

[

  AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])

  AC_CHECK_HEADERS_ONCE([sys/time.h])

  AC_CHECK_MEMBERS([struct stat.st_atim.tv_nsec],

    [AC_CACHE_CHECK([whether struct stat.st_atim is of type struct timespec],

       [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec],

       [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(

          [[

            #include <sys/types.h>

            #include <sys/stat.h>

            #if HAVE_SYS_TIME_H

            # include <sys/time.h>

            #endif

            #include <time.h>

            struct timespec ts;

            struct stat st;

          ]],

          [[

            st.st_atim = ts;

          ]])],

          [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=yes],

          [ac_cv_typeof_struct_stat_st_atim_is_struct_timespec=no])])

     if test $ac_cv_typeof_struct_stat_st_atim_is_struct_timespec = yes; then

       AC_DEFINE([TYPEOF_STRUCT_STAT_ST_ATIM_IS_STRUCT_TIMESPEC], [1],

         [Define to 1 if the type of the st_atim member of a struct stat is

          struct timespec.])

     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], [], [],

             [#include <sys/types.h>

              #include <sys/stat.h>])],

          [#include <sys/types.h>

           #include <sys/stat.h>])],

       [#include <sys/types.h>

        #include <sys/stat.h>])],

    [#include <sys/types.h>

     #include <sys/stat.h>])

])

# Check for st_birthtime, a feature from UFS2 (FreeBSD, NetBSD, OpenBSD, etc.)

# and NTFS (Cygwin).

# 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([gl_USE_SYSTEM_EXTENSIONS])

  AC_CHECK_HEADERS_ONCE([sys/time.h])

  AC_CHECK_MEMBERS([struct stat.st_birthtimespec.tv_nsec], [],

    [AC_CHECK_MEMBERS([struct stat.st_birthtimensec], [],

      [AC_CHECK_MEMBERS([struct stat.st_birthtim.tv_nsec], [], [],

         [#include <sys/types.h>

          #include <sys/stat.h>])],

       [#include <sys/types.h>

        #include <sys/stat.h>])],

    [#include <sys/types.h>

     #include <sys/stat.h>])

])