| 1 | /* Copyright (C) 1993-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <hurd.h> |
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| 19 | #include <hurd/id.h> |
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| 20 | #include <string.h> |
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| 21 | |
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| 22 | int |
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| 23 | geteuids (int n, uid_t *uidset) |
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| 24 | { |
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| 25 | error_t err; |
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| 26 | int nuids; |
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| 27 | void *crit; |
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| 28 | |
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| 29 | retry: |
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| 30 | crit = _hurd_critical_section_lock (); |
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| 31 | __mutex_lock (&_hurd_id.lock); |
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| 32 | |
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| 33 | if (err = _hurd_check_ids ()) |
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| 34 | { |
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| 35 | __mutex_unlock (&_hurd_id.lock); |
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| 36 | _hurd_critical_section_unlock (crit); |
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| 37 | if (err == EINTR) |
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| 38 | /* Got a signal while inside an RPC of the critical section, retry again */ |
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| 39 | goto retry; |
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| 40 | return __hurd_fail (err); |
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| 41 | } |
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| 42 | |
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| 43 | nuids = _hurd_id.gen.nuids; |
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| 44 | |
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| 45 | if (n != 0) |
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| 46 | { |
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| 47 | /* Copy the uids onto stack storage and then release the idlock. */ |
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| 48 | uid_t uids[nuids]; |
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| 49 | memcpy (dest: uids, src: _hurd_id.gen.uids, n: sizeof (uids)); |
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| 50 | __mutex_unlock (&_hurd_id.lock); |
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| 51 | _hurd_critical_section_unlock (crit); |
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| 52 | |
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| 53 | /* Now that the lock is released, we can safely copy the |
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| 54 | uid set into the user's array, which might fault. */ |
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| 55 | if (nuids > n) |
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| 56 | nuids = n; |
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| 57 | memcpy (dest: uidset, src: uids, n: nuids * sizeof (uid_t)); |
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| 58 | } |
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| 59 | else |
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| 60 | { |
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| 61 | __mutex_unlock (&_hurd_id.lock); |
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| 62 | _hurd_critical_section_unlock (crit); |
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| 63 | } |
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| 64 | |
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| 65 | return nuids; |
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| 66 | } |
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| 67 | |
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| 68 | /* XXX Remove this alias when we bump the libc soname. */ |
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| 69 | |
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| 70 | #ifdef SHARED |
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| 71 | weak_alias (geteuids, __getuids) |
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| 72 | #endif |
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| 73 | |
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