2 dnl Copyright (C) 2006-2009 Free Software Foundation, Inc.
3 dnl This file is free software; the Free Software Foundation
4 dnl gives unlimited permission to copy and/or distribute it,
5 dnl with or without modifications, as long as this notice is preserved.
7 AC_DEFUN([gl_FUNC_FCHDIR],
9 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
10 AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
11 AC_CHECK_FUNCS_ONCE([fchdir])
12 if test $ac_cv_func_fchdir = no; then
16 AC_DEFINE([FCHDIR_REPLACEMENT], [1],
17 [Define if gnulib's fchdir() replacement is used.])
21 AC_CACHE_CHECK([whether open can visit directories],
22 [gl_cv_func_open_directory_works],
23 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h>
24 ]], [return open(".", O_RDONLY);])],
25 [gl_cv_func_open_directory_works=yes],
26 [gl_cv_func_open_directory_works=no],
27 [gl_cv_func_open_directory_works="guessing no"])])
28 if test "$gl_cv_func_open_directory_works" != yes; then
29 AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should
30 work around the inability to open a directory.])
35 # Prerequisites of lib/fchdir.c.
36 AC_DEFUN([gl_PREREQ_FCHDIR], [:])