1 | /* Copyright (C) 1993-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library 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 GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <unistd.h> |
20 | #include <hurd.h> |
21 | #include <hurd/id.h> |
22 | |
23 | /* Get the effective group ID of the calling process. */ |
24 | gid_t |
25 | __getegid (void) |
26 | { |
27 | error_t err; |
28 | gid_t egid; |
29 | |
30 | retry: |
31 | HURD_CRITICAL_BEGIN; |
32 | __mutex_lock (&_hurd_id.lock); |
33 | |
34 | if (err = _hurd_check_ids ()) |
35 | { |
36 | errno = err; |
37 | egid = -1; |
38 | } |
39 | else if (_hurd_id.gen.ngids >= 1) |
40 | egid = _hurd_id.gen.gids[0]; |
41 | else if (_hurd_id.aux.ngids >= 1) |
42 | /* We have no effective gids. Return the real gid. */ |
43 | egid = _hurd_id.aux.gids[0]; |
44 | else |
45 | { |
46 | /* We do not even have a real gid. */ |
47 | errno = EGRATUITOUS; |
48 | egid = -1; |
49 | } |
50 | |
51 | __mutex_unlock (&_hurd_id.lock); |
52 | HURD_CRITICAL_END; |
53 | if (egid == -1 && errno == EINTR) |
54 | /* Got a signal while inside an RPC of the critical section, retry again */ |
55 | goto retry; |
56 | |
57 | return egid; |
58 | } |
59 | |
60 | weak_alias (__getegid, getegid) |
61 | |