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d614a753 | 1 | /* Copyright (C) 1993-2020 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 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <unistd.h> | |
20 | #include <hurd.h> | |
21 | #include <hurd/id.h> | |
22 | #include <string.h> | |
23 | ||
24 | int | |
bd2260a2 | 25 | __getgroups (int n, gid_t *gidset) |
28f540f4 RM |
26 | { |
27 | error_t err; | |
28 | int ngids; | |
29 | void *crit; | |
30 | ||
0ced335a PT |
31 | if (n < 0) |
32 | return __hurd_fail (EINVAL); | |
33 | ||
28f540f4 RM |
34 | crit = _hurd_critical_section_lock (); |
35 | __mutex_lock (&_hurd_id.lock); | |
36 | ||
37 | if (err = _hurd_check_ids ()) | |
38 | { | |
39 | __mutex_unlock (&_hurd_id.lock); | |
40 | _hurd_critical_section_unlock (crit); | |
41 | return __hurd_fail (err); | |
42 | } | |
43 | ||
44 | ngids = _hurd_id.gen.ngids; | |
45 | ||
46 | if (n != 0) | |
47 | { | |
48 | /* Copy the gids onto stack storage and then release the idlock. */ | |
49 | gid_t gids[ngids]; | |
50 | memcpy (gids, _hurd_id.gen.gids, sizeof (gids)); | |
51 | __mutex_unlock (&_hurd_id.lock); | |
52 | _hurd_critical_section_unlock (crit); | |
53 | ||
54 | /* Now that the lock is released, we can safely copy the | |
55 | group set into the user's array, which might fault. */ | |
56 | if (ngids > n) | |
0ced335a | 57 | return __hurd_fail (EINVAL); |
28f540f4 RM |
58 | memcpy (gidset, gids, ngids * sizeof (gid_t)); |
59 | } | |
60 | else | |
61 | { | |
62 | __mutex_unlock (&_hurd_id.lock); | |
63 | _hurd_critical_section_unlock (crit); | |
64 | } | |
65 | ||
66 | return ngids; | |
67 | } | |
68 | ||
69 | weak_alias (__getgroups, getgroups) |