1 /* Change the protections of file relative to an open directory.
2 Copyright (C) 2006, 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 Jim Meyering */
23 #include "dirname.h" /* solely for definition of IS_ABSOLUTE_FILE_NAME */
25 #include "openat-priv.h"
29 /* Use a different name, to avoid conflicting with any
30 system-supplied declaration. */
32 # define lchmod lchmod_rpl
33 static int lchmod (char const *f, mode_t m) { errno = ENOSYS; return -1; }
36 /* Solaris 10 has no function like this.
37 Invoke chmod or lchmod on file, FILE, using mode MODE, in the directory
38 open on descriptor FD. If possible, do it without changing the
39 working directory. Otherwise, resort to using save_cwd/fchdir,
40 then (chmod|lchmod)/restore_cwd. If either the save_cwd or the
41 restore_cwd fails, then give a diagnostic and exit nonzero.
42 Note that an attempt to use a FLAG value of AT_SYMLINK_NOFOLLOW
43 on a system without lchmod support causes this function to fail. */
45 #define AT_FUNC_NAME fchmodat
46 #define AT_FUNC_F1 lchmod
47 #define AT_FUNC_F2 chmod
48 #define AT_FUNC_USE_F1_COND AT_SYMLINK_NOFOLLOW
49 #define AT_FUNC_POST_FILE_PARAM_DECLS , mode_t mode, int flag
50 #define AT_FUNC_POST_FILE_ARGS , mode