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dnl Copyright (C) 2003-2017 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
dnl serial 8
AC_DEFUN([gl_UTIMENS],
[
dnl Prerequisites of lib/utimens.c.
AC_REQUIRE([gl_FUNC_UTIMES])
AC_REQUIRE([gl_CHECK_TYPE_STRUCT_TIMESPEC])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CHECK_FUNCS_ONCE([futimes futimesat futimens utimensat lutimes])
if test $ac_cv_func_futimens = no && test $ac_cv_func_futimesat = yes; then
dnl FreeBSD 8.0-rc2 mishandles futimesat(fd,NULL,time). It is not
dnl standardized, but Solaris implemented it first and uses it as
dnl its only means to set fd time.
AC_CACHE_CHECK([whether futimesat handles NULL file],
[gl_cv_func_futimesat_works],
[touch conftest.file
AC_RUN_IFELSE([AC_LANG_PROGRAM([[
#include <stddef.h>
#include <sys/times.h>
#include <fcntl.h>
]], [[ int fd = open ("conftest.file", O_RDWR);
if (fd < 0) return 1;
if (futimesat (fd, NULL, NULL)) return 2;
]])],
[gl_cv_func_futimesat_works=yes],
[gl_cv_func_futimesat_works=no],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu*) gl_cv_func_futimesat_works="guessing yes" ;;
# If we don't know, assume the worst.
*) gl_cv_func_futimesat_works="guessing no" ;;
esac
])
rm -f conftest.file])
case "$gl_cv_func_futimesat_works" in
*yes) ;;
*)
AC_DEFINE([FUTIMESAT_NULL_BUG], [1],
[Define to 1 if futimesat mishandles a NULL file name.])
;;
esac
fi
])
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