-# serial 17 -*- Autoconf -*-
+# serial 24 -*- Autoconf -*-
dnl Find out how to get the file descriptor associated with an open DIR*.
-# Copyright (C) 2001-2006, 2008-2010 Free Software Foundation, Inc.
+# Copyright (C) 2001-2006, 2008-2016 Free Software Foundation, Inc.
# This file is free software; the Free Software Foundation
# gives unlimited permission to copy and/or distribute it,
# with or without modifications, as long as this notice is preserved.
AC_DEFUN([gl_FUNC_DIRFD],
[
AC_REQUIRE([gl_DIRENT_H_DEFAULTS])
- gl_REPLACE_DIRENT_H
dnl Persuade glibc <dirent.h> to declare dirfd().
AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS])
- dnl Work around a bug of AC_EGREP_CPP in autoconf-2.57.
- AC_REQUIRE([AC_PROG_CPP])
- AC_REQUIRE([AC_PROG_EGREP])
-
AC_CHECK_FUNCS([dirfd])
AC_CHECK_DECLS([dirfd], , ,
- [#include <sys/types.h>
- #include <dirent.h>])
+ [[#include <sys/types.h>
+ #include <dirent.h>]])
if test $ac_cv_have_decl_dirfd = no; then
HAVE_DECL_DIRFD=0
fi
gl_cv_func_dirfd_macro=yes,
gl_cv_func_dirfd_macro=no)])
- # Use the replacement only if we have no function, macro,
- # or declaration with that name.
- if test $ac_cv_func_dirfd,$ac_cv_have_decl_dirfd,$gl_cv_func_dirfd_macro \
- = no,no,no; then
- AC_REPLACE_FUNCS([dirfd])
- AC_CACHE_CHECK(
- [how to get the file descriptor associated with an open DIR*],
- gl_cv_sys_dir_fd_member_name,
- [
- dirfd_save_CFLAGS=$CFLAGS
- for ac_expr in d_fd dd_fd; do
+ # Use the replacement if we have no function or macro with that name,
+ # or if OS/2 kLIBC whose dirfd() does not work.
+ # Replace only if the system declares dirfd already.
+ case $ac_cv_func_dirfd,$gl_cv_func_dirfd_macro,$host_os,$ac_cv_have_decl_dirfd in
+ no,no,*,yes | *,*,os2*,yes)
+ REPLACE_DIRFD=1
+ AC_DEFINE([REPLACE_DIRFD], [1],
+ [Define to 1 if gnulib's dirfd() replacement is used.]);;
+ esac
+])
+
+dnl Prerequisites of lib/dirfd.c.
+AC_DEFUN([gl_PREREQ_DIRFD],
+[
+ AC_CACHE_CHECK([how to get the file descriptor associated with an open DIR*],
+ [gl_cv_sys_dir_fd_member_name],
+ [
+ dirfd_save_CFLAGS=$CFLAGS
+ for ac_expr in d_fd dd_fd; do
- CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
- AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
- #include <sys/types.h>
- #include <dirent.h>]],
- [[DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;]])],
- [dir_fd_found=yes]
- )
- CFLAGS=$dirfd_save_CFLAGS
- test "$dir_fd_found" = yes && break
- done
- test "$dir_fd_found" = yes || ac_expr=no_such_member
+ CFLAGS="$CFLAGS -DDIR_FD_MEMBER_NAME=$ac_expr"
+ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
+ #include <sys/types.h>
+ #include <dirent.h>]],
+ [[DIR *dir_p = opendir("."); (void) dir_p->DIR_FD_MEMBER_NAME;]])],
+ [dir_fd_found=yes]
+ )
+ CFLAGS=$dirfd_save_CFLAGS
+ test "$dir_fd_found" = yes && break
+ done
+ test "$dir_fd_found" = yes || ac_expr=no_such_member
- gl_cv_sys_dir_fd_member_name=$ac_expr
- ]
- )
- if test $gl_cv_sys_dir_fd_member_name != no_such_member; then
- AC_DEFINE_UNQUOTED([DIR_FD_MEMBER_NAME],
- $gl_cv_sys_dir_fd_member_name,
- [the name of the file descriptor member of DIR])
- fi
- AH_VERBATIM(DIR_TO_FD,
- [#ifdef DIR_FD_MEMBER_NAME
+ gl_cv_sys_dir_fd_member_name=$ac_expr
+ ]
+ )
+ if test $gl_cv_sys_dir_fd_member_name != no_such_member; then
+ AC_DEFINE_UNQUOTED([DIR_FD_MEMBER_NAME],
+ [$gl_cv_sys_dir_fd_member_name],
+ [the name of the file descriptor member of DIR])
+ fi
+ AH_VERBATIM([DIR_TO_FD],
+ [#ifdef DIR_FD_MEMBER_NAME
# define DIR_TO_FD(Dir_p) ((Dir_p)->DIR_FD_MEMBER_NAME)
#else
# define DIR_TO_FD(Dir_p) -1
#endif
])
- fi
])