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 <sys/types.h>
20 #include <grp.h>
21 #include <hurd.h>
22 #include <hurd/id.h>
23
24 /* Set the group set for the current user to GROUPS (N of them). */
25 int
setgroups(size_t n,const gid_t * groups)26 setgroups (size_t n, const gid_t *groups)
27 {
28 error_t err;
29 auth_t newauth;
30 size_t i;
31 gid_t new[n];
32
33 /* Fault before taking locks. */
34 for (i = 0; i < n; ++i)
35 new[i] = groups[i];
36
37 retry:
38 HURD_CRITICAL_BEGIN;
39 __mutex_lock (&_hurd_id.lock);
40 err = _hurd_check_ids ();
41 if (! err)
42 {
43 /* Get a new auth port using those IDs. */
44 err = __USEPORT (AUTH,
45 __auth_makeauth (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
46 _hurd_id.gen.uids, _hurd_id.gen.nuids,
47 _hurd_id.aux.uids, _hurd_id.aux.nuids,
48 new, n,
49 _hurd_id.aux.gids, _hurd_id.aux.ngids,
50 &newauth));
51 }
52 __mutex_unlock (&_hurd_id.lock);
53 HURD_CRITICAL_END;
54 if (err == EINTR)
55 /* Got a signal while inside an RPC of the critical section, retry again */
56 goto retry;
57
58 if (err)
59 return __hurd_fail (err);
60
61 /* Install the new auth port and reauthenticate everything. */
62 err = __setauth (newauth);
63 __mach_port_deallocate (__mach_task_self (), newauth);
64 return err;
65 }
66 libc_hidden_def (setgroups)
67