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1 | /* Copyright (C) 1993-2024 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 | #include <string.h> | |
21 | ||
22 | int | |
23 | geteuids (int n, uid_t *uidset) | |
24 | { | |
25 | error_t err; | |
26 | int nuids; | |
27 | void *crit; | |
28 | ||
29 | retry: | |
30 | crit = _hurd_critical_section_lock (); | |
31 | __mutex_lock (&_hurd_id.lock); | |
32 | ||
33 | if (err = _hurd_check_ids ()) | |
34 | { | |
35 | __mutex_unlock (&_hurd_id.lock); | |
36 | _hurd_critical_section_unlock (crit); | |
37 | if (err == EINTR) | |
38 | /* Got a signal while inside an RPC of the critical section, retry again */ | |
39 | goto retry; | |
40 | return __hurd_fail (err); | |
41 | } | |
42 | ||
43 | nuids = _hurd_id.gen.nuids; | |
44 | ||
45 | if (n != 0) | |
46 | { | |
47 | /* Copy the uids onto stack storage and then release the idlock. */ | |
48 | uid_t uids[nuids]; | |
49 | memcpy (uids, _hurd_id.gen.uids, sizeof (uids)); | |
50 | __mutex_unlock (&_hurd_id.lock); | |
51 | _hurd_critical_section_unlock (crit); | |
52 | ||
53 | /* Now that the lock is released, we can safely copy the | |
54 | uid set into the user's array, which might fault. */ | |
55 | if (nuids > n) | |
56 | nuids = n; | |
57 | memcpy (uidset, uids, nuids * sizeof (uid_t)); | |
58 | } | |
59 | else | |
60 | { | |
61 | __mutex_unlock (&_hurd_id.lock); | |
62 | _hurd_critical_section_unlock (crit); | |
63 | } | |
64 | ||
65 | return nuids; | |
66 | } | |
67 | ||
68 | /* XXX Remove this alias when we bump the libc soname. */ | |
69 | ||
70 | #ifdef SHARED | |
71 | weak_alias (geteuids, __getuids) | |
72 | #endif |