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 real user ID of the calling process. */ |
24 | uid_t |
25 | __getuid (void) |
26 | { |
27 | error_t err; |
28 | uid_t uid; |
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 | uid = -1; |
38 | } |
39 | else if (_hurd_id.aux.nuids >= 1) |
40 | uid = _hurd_id.aux.uids[0]; |
41 | else |
42 | { |
43 | /* We do not even have a real uid. */ |
44 | errno = EGRATUITOUS; |
45 | uid = -1; |
46 | } |
47 | |
48 | __mutex_unlock (&_hurd_id.lock); |
49 | HURD_CRITICAL_END; |
50 | if (uid == -1 && errno == EINTR) |
51 | /* Got a signal while inside an RPC of the critical section, retry again */ |
52 | goto retry; |
53 | |
54 | return uid; |
55 | } |
56 | |
57 | weak_alias (__getuid, getuid) |
58 | |