-# fchdir.m4 serial 5
-dnl Copyright (C) 2006-2008 Free Software Foundation, Inc.
+# fchdir.m4 serial 13
+dnl Copyright (C) 2006-2010 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.
AC_DEFUN([gl_FUNC_FCHDIR],
[
AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
+ AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
+ AC_REQUIRE([gl_SYS_STAT_H_DEFAULTS])
AC_CHECK_FUNCS_ONCE([fchdir])
if test $ac_cv_func_fchdir = no; then
REPLACE_FCHDIR=1
AC_LIBOBJ([fchdir])
gl_PREREQ_FCHDIR
- AC_DEFINE([FCHDIR_REPLACEMENT], 1,
- [Define if gnulib's fchdir() replacement is used.])
+ AC_DEFINE([REPLACE_FCHDIR], [1],
+ [Define to 1 if gnulib's fchdir() replacement is used.])
+ dnl We must also replace anything that can manipulate a directory fd,
+ dnl to keep our bookkeeping up-to-date. We don't have to replace
+ dnl fstatat, since no platform has fstatat but lacks fchdir.
+ REPLACE_OPENDIR=1
+ REPLACE_CLOSEDIR=1
+ REPLACE_DUP=1
gl_REPLACE_OPEN
gl_REPLACE_CLOSE
- gl_CHECK_NEXT_HEADERS([dirent.h])
- DIRENT_H='dirent.h'
- else
- DIRENT_H=
+ gl_REPLACE_DUP2
+ dnl dup3 is already unconditionally replaced
+ gl_REPLACE_FCNTL
+ gl_REPLACE_DIRENT_H
+ AC_CACHE_CHECK([whether open can visit directories],
+ [gl_cv_func_open_directory_works],
+ [AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <fcntl.h>
+]], [return open(".", O_RDONLY) < 0;])],
+ [gl_cv_func_open_directory_works=yes],
+ [gl_cv_func_open_directory_works=no],
+ [gl_cv_func_open_directory_works="guessing no"])])
+ if test "$gl_cv_func_open_directory_works" != yes; then
+ AC_DEFINE([REPLACE_OPEN_DIRECTORY], [1], [Define to 1 if open() should
+work around the inability to open a directory.])
+ REPLACE_FSTAT=1
+ fi
fi
- AC_SUBST([DIRENT_H])
])
# Prerequisites of lib/fchdir.c.