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b168057a | 1 | /* Copyright (C) 1993-2015 Free Software Foundation, Inc. |
ebbad4cc | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
ebbad4cc UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <unistd.h> | |
20 | #include <hurd.h> | |
21 | #include <sys/types.h> | |
22 | #include <hurd/id.h> | |
23 | #include <string.h> | |
24 | ||
25 | /* Set the effective user ID of the calling process to GID. */ | |
26 | int | |
bd2260a2 | 27 | setegid (gid_t gid) |
28f540f4 RM |
28 | { |
29 | auth_t newauth; | |
30 | error_t err; | |
31 | ||
32 | HURD_CRITICAL_BEGIN; | |
33 | __mutex_lock (&_hurd_id.lock); | |
34 | err = _hurd_check_ids (); | |
35 | ||
36 | if (!err) | |
37 | { | |
38 | /* Make a new auth handle which has EGID as the first element in the | |
39 | list of effective gids. */ | |
40 | ||
97532098 RM |
41 | if (_hurd_id.gen.ngids > 0) |
42 | { | |
43 | _hurd_id.gen.gids[0] = gid; | |
44 | _hurd_id.valid = 0; | |
45 | } | |
28f540f4 RM |
46 | |
47 | err = __USEPORT (AUTH, __auth_makeauth | |
48 | (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0, | |
49 | _hurd_id.gen.uids, _hurd_id.gen.nuids, | |
50 | _hurd_id.aux.uids, _hurd_id.aux.nuids, | |
97532098 RM |
51 | _hurd_id.gen.ngids ? _hurd_id.gen.gids : &gid, |
52 | _hurd_id.gen.ngids ?: 1, | |
28f540f4 RM |
53 | _hurd_id.aux.gids, _hurd_id.aux.ngids, |
54 | &newauth)); | |
55 | } | |
56 | __mutex_unlock (&_hurd_id.lock); | |
57 | HURD_CRITICAL_END; | |
58 | ||
59 | if (err) | |
60 | return __hurd_fail (err); | |
61 | ||
62 | /* Install the new handle and reauthenticate everything. */ | |
63 | err = __setauth (newauth); | |
64 | __mach_port_deallocate (__mach_task_self (), newauth); | |
65 | return err; | |
66 | } | |
6e86f21f | 67 | libc_hidden_def (setegid) |