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- /* Check the access rights of a file relative to an open directory.
- Copyright (C) 2009-2017 Free Software Foundation, Inc.
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 3 of the License, or
- (at your option) any later version.
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /* written by Eric Blake */
- #include <config.h>
- #include <unistd.h>
- #include <fcntl.h>
- #ifndef HAVE_ACCESS
- /* Mingw lacks access, but it also lacks real vs. effective ids, so
- the gnulib euidaccess module is good enough. */
- # undef access
- # define access euidaccess
- #endif
- /* Invoke access or euidaccess on file, FILE, using mode MODE, in the directory
- open on descriptor FD. If possible, do it without changing the
- working directory. Otherwise, resort to using save_cwd/fchdir, then
- (access|euidaccess)/restore_cwd. If either the save_cwd or the
- restore_cwd fails, then give a diagnostic and exit nonzero.
- Note that this implementation only supports AT_EACCESS, although some
- native versions also support AT_SYMLINK_NOFOLLOW. */
- #define AT_FUNC_NAME faccessat
- #define AT_FUNC_F1 euidaccess
- #define AT_FUNC_F2 access
- #define AT_FUNC_USE_F1_COND AT_EACCESS
- #define AT_FUNC_POST_FILE_PARAM_DECLS , int mode, int flag
- #define AT_FUNC_POST_FILE_ARGS , mode
- #include "at-func.c"
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