1 /* Check the access rights of a file relative to an open directory.
2 Copyright (C) 2009 Free Software Foundation, Inc.
4 This program is free software: you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 3 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17 /* written by Eric Blake */
23 #include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
25 #include "openat-priv.h"
29 /* Mingw lacks access, but it also lacks real vs. effective ids, so
30 the gnulib euidaccess module is good enough. */
32 # define access euidaccess
35 /* Invoke access or euidaccess on file, FILE, using mode MODE, in the directory
36 open on descriptor FD. If possible, do it without changing the
37 working directory. Otherwise, resort to using save_cwd/fchdir, then
38 (access|euidaccess)/restore_cwd. If either the save_cwd or the
39 restore_cwd fails, then give a diagnostic and exit nonzero.
40 Note that this implementation only supports AT_EACCESS, although some
41 native versions also support AT_SYMLINK_NOFOLLOW. */
43 #define AT_FUNC_NAME faccessat
44 #define AT_FUNC_F1 euidaccess
45 #define AT_FUNC_F2 access
46 #define AT_FUNC_USE_F1_COND AT_EACCESS
47 #define AT_FUNC_POST_FILE_PARAM_DECLS , int mode, int flag
48 #define AT_FUNC_POST_FILE_ARGS , mode