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[glibc.git] / hurd / getuids.c
blobf367e0ea9a4e7050e110e2d5d8b3cb30a434f4a8
1 /* Copyright (C) 1993, 1994, 1996, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Library General Public License as
6 published by the Free Software Foundation; either version 2 of the
7 License, or (at your option) any later version.
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 Library General Public License for more details.
14 You should have received a copy of the GNU Library General Public
15 License along with the GNU C Library; see the file COPYING.LIB. If not,
16 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 Boston, MA 02111-1307, USA. */
19 #include <hurd.h>
20 #include <hurd/id.h>
21 #include <string.h>
23 int
24 __getuids (int n, uid_t *uidset)
26 error_t err;
27 int nuids;
28 void *crit;
30 crit = _hurd_critical_section_lock ();
31 __mutex_lock (&_hurd_id.lock);
33 if (err = _hurd_check_ids ())
35 __mutex_unlock (&_hurd_id.lock);
36 _hurd_critical_section_unlock (crit);
37 return __hurd_fail (err);
40 nuids = _hurd_id.gen.nuids;
42 if (n != 0)
44 /* Copy the uids onto stack storage and then release the idlock. */
45 uid_t uids[nuids];
46 memcpy (uids, _hurd_id.gen.uids, sizeof (uids));
47 __mutex_unlock (&_hurd_id.lock);
48 _hurd_critical_section_unlock (crit);
50 /* Now that the lock is released, we can safely copy the
51 uid set into the user's array, which might fault. */
52 if (nuids > n)
53 nuids = n;
54 memcpy (uidset, uids, nuids * sizeof (uid_t));
56 else
58 __mutex_unlock (&_hurd_id.lock);
59 _hurd_critical_section_unlock (crit);
62 return nuids;
65 weak_alias (__getuids, getuids)