Mercurial > gnulib
view m4/dirfd.m4 @ 36940:c741bc27922a
maint: update all copyright year number ranges
Run "make update-copyright". Compare to commit 1602f0a from last year.
Signed-off-by: Eric Blake <eblake@redhat.com>
author | Eric Blake <eblake@redhat.com> |
---|---|
date | Tue, 01 Jan 2013 00:50:58 +0000 |
parents | 807a2defea28 |
children | 344018b6e5d7 |
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# serial 22 -*- Autoconf -*- dnl Find out how to get the file descriptor associated with an open DIR*. # Copyright (C) 2001-2006, 2008-2013 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. dnl From Jim Meyering AC_DEFUN([gl_FUNC_DIRFD], [ AC_REQUIRE([gl_DIRENT_H_DEFAULTS]) dnl Persuade glibc <dirent.h> to declare dirfd(). AC_REQUIRE([AC_USE_SYSTEM_EXTENSIONS]) AC_CHECK_FUNCS([dirfd]) AC_CHECK_DECLS([dirfd], , , [[#include <sys/types.h> #include <dirent.h>]]) if test $ac_cv_have_decl_dirfd = no; then HAVE_DECL_DIRFD=0 fi AC_CACHE_CHECK([whether dirfd is a macro], gl_cv_func_dirfd_macro, [AC_EGREP_CPP([dirent_header_defines_dirfd], [ #include <sys/types.h> #include <dirent.h> #ifdef dirfd dirent_header_defines_dirfd #endif], gl_cv_func_dirfd_macro=yes, gl_cv_func_dirfd_macro=no)]) # Use the replacement only if we have no function or macro with that name. if test $ac_cv_func_dirfd = no && test $gl_cv_func_dirfd_macro = no; then if test $ac_cv_have_decl_dirfd = yes; then # If the system declares dirfd already, let's declare rpl_dirfd instead. REPLACE_DIRFD=1 fi fi ]) dnl Prerequisites of lib/dirfd.c. AC_DEFUN([gl_PREREQ_DIRFD], [ AC_CACHE_CHECK([how to get the file descriptor associated with an open DIR*], [gl_cv_sys_dir_fd_member_name], [ dirfd_save_CFLAGS=$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 "$dir_fd_found" = yes || ac_expr=no_such_member gl_cv_sys_dir_fd_member_name=$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 ]) ])