2 dnl Copyright (C) 2006-2012 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])
12 AC_CHECK_DECLS_ONCE([fchdir])
13 if test $ac_cv_have_decl_fchdir = no; then
17 AC_REQUIRE([gl_TEST_FCHDIR])
18 if test $HAVE_FCHDIR = 0; then
21 AC_DEFINE([REPLACE_FCHDIR], [1],
22 [Define to 1 if gnulib's fchdir() replacement is used.])
23 dnl We must also replace anything that can manipulate a directory fd,
24 dnl to keep our bookkeeping up-to-date. We don't have to replace
25 dnl fstatat, since no platform has fstatat but lacks fchdir.
26 AC_CACHE_CHECK([whether open can visit directories],
27 [gl_cv_func_open_directory_works],
28 [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h>
29 ]], [return open(".", O_RDONLY) < 0;])],
30 [gl_cv_func_open_directory_works=yes],
31 [gl_cv_func_open_directory_works=no],
32 [gl_cv_func_open_directory_works="guessing no"])])
33 if test "$gl_cv_func_open_directory_works" != yes; then
34 AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should
35 work around the inability to open a directory.])
40 # Determine whether to use the overrides in lib/fchdir.c.
41 AC_DEFUN([gl_TEST_FCHDIR],
43 AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
44 AC_CHECK_FUNCS_ONCE([fchdir])
45 if test $ac_cv_func_fchdir = no; then
50 # Prerequisites of lib/fchdir.c.
51 AC_DEFUN([gl_PREREQ_FCHDIR], [:])