| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 1993-2016 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 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <errno.h> |
| 19 | #include <unistd.h> |
| 20 | #include <hurd.h> |
| 21 | #include <hurd/id.h> |
| 22 | #include <string.h> |
| 23 | |
| 24 | int |
| 25 | __getgroups (int n, gid_t *gidset) |
| 26 | { |
| 27 | error_t err; |
| 28 | int ngids; |
| 29 | void *crit; |
| 30 | |
| 31 | if (n < 0) |
| 32 | return __hurd_fail (EINVAL); |
| 33 | |
| 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) |
| 57 | return __hurd_fail (EINVAL); |
| 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) |