1 | /* `group_member' -- test if process is in a given group. Hurd version. |
2 | Copyright (C) 1993-2022 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 | int |
25 | __group_member (gid_t gid) |
26 | { |
27 | int member = 0; |
28 | error_t err; |
29 | void *crit; |
30 | |
31 | retry: |
32 | crit = _hurd_critical_section_lock (); |
33 | __mutex_lock (&_hurd_id.lock); |
34 | |
35 | err = _hurd_check_ids (); |
36 | if (! err) |
37 | { |
38 | size_t i; |
39 | for (i = 0; i < _hurd_id.gen.ngids; ++i) |
40 | if (_hurd_id.gen.gids[i] == gid) |
41 | { |
42 | member = 1; |
43 | break; |
44 | } |
45 | } |
46 | |
47 | __mutex_unlock (&_hurd_id.lock); |
48 | _hurd_critical_section_unlock (crit); |
49 | if (err == EINTR) |
50 | /* Got a signal while inside an RPC of the critical section, retry again */ |
51 | goto retry; |
52 | |
53 | if (err) |
54 | __hurd_fail (err); |
55 | return member; |
56 | } |
57 | |
58 | weak_alias (__group_member, group_member) |
59 | |