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73dcdb9f PE |
1 | /* Check the access rights of a file relative to an open directory. |
2 | Copyright (C) 2009-2012 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" |