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ffdc270a PE |
1 | /* Test whether ACLs are well supported on this system. |
2 | ||
3 | Copyright 2013 Free Software Foundation, Inc. | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | ||
18 | Written by Paul Eggert. */ | |
19 | ||
20 | #include <config.h> | |
21 | ||
22 | #include <acl.h> | |
23 | ||
24 | #include <errno.h> | |
25 | ||
26 | /* Return true if errno value ERRNUM indicates that ACLs are well | |
27 | supported on this system. ERRNUM should be an errno value obtained | |
28 | after an ACL-related system call fails. */ | |
29 | bool | |
30 | acl_errno_valid (int errnum) | |
31 | { | |
32 | /* Recognize some common errors such as from an NFS mount that does | |
33 | not support ACLs, even when local drives do. */ | |
34 | switch (errnum) | |
35 | { | |
36 | case EBUSY: return false; | |
37 | case EINVAL: return false; | |
38 | #if defined __APPLE__ && defined __MACH__ | |
39 | case ENOENT: return false; | |
40 | #endif | |
41 | case ENOSYS: return false; | |
42 | ||
43 | #if defined ENOTSUP && ENOTSUP != EOPNOTSUPP | |
44 | # if ENOTSUP != ENOSYS /* Needed for the MS-Windows port of GNU Emacs. */ | |
45 | case ENOTSUP: return false; | |
46 | # endif | |
47 | #endif | |
48 | ||
49 | case EOPNOTSUPP: return false; | |
50 | default: return true; | |
51 | } | |
52 | } |