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 <hurd.h>
19 #include <hurd/id.h>
20
21 /* Set the uid set for the current user to UIDS (N of them). */
22 int
seteuids(int n,const uid_t * uids)23 seteuids (int n, const uid_t *uids)
24 {
25 error_t err;
26 auth_t newauth;
27 int i;
28 gid_t new[n];
29
30 /* Fault before taking locks. */
31 for (i = 0; i < n; ++i)
32 new[i] = uids[i];
33
34 retry:
35 HURD_CRITICAL_BEGIN;
36 __mutex_lock (&_hurd_id.lock);
37 err = _hurd_check_ids ();
38 if (! err)
39 {
40 /* Get a new auth port using those IDs. */
41 err = __USEPORT (AUTH,
42 __auth_makeauth (port, NULL, 0, 0,
43 new, n,
44 _hurd_id.aux.uids, _hurd_id.aux.nuids,
45 _hurd_id.gen.gids, _hurd_id.gen.ngids,
46 _hurd_id.aux.gids, _hurd_id.aux.ngids,
47 &newauth));
48 }
49 __mutex_unlock (&_hurd_id.lock);
50 HURD_CRITICAL_END;
51 if (err == EINTR)
52 /* Got a signal while inside an RPC of the critical section, retry again */
53 goto retry;
54
55 if (err)
56 return __hurd_fail (err);
57
58 /* Install the new auth port and reauthenticate everything. */
59 err = __setauth (newauth);
60 __mach_port_deallocate (__mach_task_self (), newauth);
61 return err;
62 }
63