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 $ac_cv_func_fchdir = no; then
16 AC_DEFINE([FCHDIR_REPLACEMENT], [1],
17 [Define if gnulib's fchdir() replacement is used.])
21 dnl dup3 is already unconditionally replaced
23 AC_CACHE_CHECK([whether open can visit directories],
24 [gl_cv_func_open_directory_works],
25 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h>
26 ]], [return open(".", O_RDONLY);])],
27 [gl_cv_func_open_directory_works=yes],
28 [gl_cv_func_open_directory_works=no],
29 [gl_cv_func_open_directory_works="guessing no"])])
30 if test "$gl_cv_func_open_directory_works" != yes; then
31 AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should
32 work around the inability to open a directory.])
37 # Prerequisites of lib/fchdir.c.
38 AC_DEFUN([gl_PREREQ_FCHDIR], [:])