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
__getuid(void)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