1 | /* getresgid -- fetch real group ID, effective group ID, and saved-set group ID |
2 | Copyright (C) 2002-2022 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either |
8 | version 2.1 of the License, or (at your option) any later version. |
9 | |
10 | The GNU C Library 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 GNU |
13 | Lesser General Public License for more details. |
14 | |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, see |
17 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #include <errno.h> |
20 | #include <unistd.h> |
21 | #include <hurd.h> |
22 | #include <hurd/id.h> |
23 | |
24 | /* Fetch the real group ID, effective group ID, and saved-set group ID, |
25 | of the calling process. */ |
26 | int |
27 | __getresgid (gid_t *rgid, gid_t *egid, gid_t *sgid) |
28 | { |
29 | error_t err; |
30 | |
31 | retry: |
32 | HURD_CRITICAL_BEGIN; |
33 | __mutex_lock (&_hurd_id.lock); |
34 | |
35 | err = _hurd_check_ids (); |
36 | if (!err) |
37 | { |
38 | if (_hurd_id.aux.ngids < 1) |
39 | /* We do not even have a real GID. */ |
40 | err = EGRATUITOUS; |
41 | else |
42 | { |
43 | gid_t real = _hurd_id.aux.gids[0]; |
44 | |
45 | *rgid = real; |
46 | *egid = _hurd_id.gen.ngids < 1 ? real : _hurd_id.gen.gids[0]; |
47 | *sgid = _hurd_id.aux.ngids < 2 ? real : _hurd_id.aux.gids[1]; |
48 | } |
49 | } |
50 | |
51 | __mutex_unlock (&_hurd_id.lock); |
52 | HURD_CRITICAL_END; |
53 | if (err == EINTR) |
54 | /* Got a signal while inside an RPC of the critical section, retry again */ |
55 | goto retry; |
56 | |
57 | return __hurd_fail (err); |
58 | } |
59 | libc_hidden_def (__getresgid) |
60 | weak_alias (__getresgid, getresgid) |
61 | |