1 /* Check the access rights of a file relative to an open directory. 2 Copyright (C) 2009-2014 Free Software Foundation, Inc. 3 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. 8 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. 13 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/>. */ 16 17 /* written by Eric Blake */ 18 19 #include <config.h> 20 21 #include <unistd.h> 22 #include <fcntl.h> 23 24 #ifndef HAVE_ACCESS 25 /* Mingw lacks access, but it also lacks real vs. effective ids, so 26 the gnulib euidaccess module is good enough. */ 27 # undef access 28 # define access euidaccess 29 #endif 30 31 /* Invoke access or euidaccess on file, FILE, using mode MODE, in the directory 32 open on descriptor FD. If possible, do it without changing the 33 working directory. Otherwise, resort to using save_cwd/fchdir, then 34 (access|euidaccess)/restore_cwd. If either the save_cwd or the 35 restore_cwd fails, then give a diagnostic and exit nonzero. 36 Note that this implementation only supports AT_EACCESS, although some 37 native versions also support AT_SYMLINK_NOFOLLOW. */ 38 39 #define AT_FUNC_NAME faccessat 40 #define AT_FUNC_F1 euidaccess 41 #define AT_FUNC_F2 access 42 #define AT_FUNC_USE_F1_COND AT_EACCESS 43 #define AT_FUNC_POST_FILE_PARAM_DECLS , int mode, int flag 44 #define AT_FUNC_POST_FILE_ARGS , mode 45 #include "at-func.c" 46