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sourceware.org Git - glibc.git/blob - sysdeps/mach/hurd/getgroups.c
1 /* Copyright (C) 1993-2015 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 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.
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.
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/>. */
25 __getgroups (int n
, gid_t
*gidset
)
32 return __hurd_fail (EINVAL
);
34 crit
= _hurd_critical_section_lock ();
35 __mutex_lock (&_hurd_id
.lock
);
37 if (err
= _hurd_check_ids ())
39 __mutex_unlock (&_hurd_id
.lock
);
40 _hurd_critical_section_unlock (crit
);
41 return __hurd_fail (err
);
44 ngids
= _hurd_id
.gen
.ngids
;
48 /* Copy the gids onto stack storage and then release the idlock. */
50 memcpy (gids
, _hurd_id
.gen
.gids
, sizeof (gids
));
51 __mutex_unlock (&_hurd_id
.lock
);
52 _hurd_critical_section_unlock (crit
);
54 /* Now that the lock is released, we can safely copy the
55 group set into the user's array, which might fault. */
57 return __hurd_fail (EINVAL
);
58 memcpy (gidset
, gids
, ngids
* sizeof (gid_t
));
62 __mutex_unlock (&_hurd_id
.lock
);
63 _hurd_critical_section_unlock (crit
);
69 weak_alias (__getgroups
, getgroups
)
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