1 /* `group_member' -- test if process is in a given group.  Hurd version.
2    Copyright (C) 1993-2022 Free Software Foundation, Inc.
3    This file is part of the GNU C Library.
4 
5    The GNU C Library is free software; you can redistribute it and/or
6    modify it under the terms of the GNU Lesser General Public
7    License as published by the Free Software Foundation; either
8    version 2.1 of the License, or (at your option) any later version.
9 
10    The GNU C Library is distributed in the hope that it will be useful,
11    but WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    Lesser General Public License for more details.
14 
15    You should have received a copy of the GNU Lesser General Public
16    License along with the GNU C Library; if not, see
17    <https://www.gnu.org/licenses/>.  */
18 
19 #include <errno.h>
20 #include <unistd.h>
21 #include <hurd.h>
22 #include <hurd/id.h>
23 
24 int
__group_member(gid_t gid)25 __group_member (gid_t gid)
26 {
27   int member = 0;
28   error_t err;
29   void *crit;
30 
31 retry:
32   crit = _hurd_critical_section_lock ();
33   __mutex_lock (&_hurd_id.lock);
34 
35   err = _hurd_check_ids ();
36   if (! err)
37     {
38       size_t i;
39       for (i = 0; i < _hurd_id.gen.ngids; ++i)
40 	if (_hurd_id.gen.gids[i] == gid)
41 	  {
42 	    member = 1;
43 	    break;
44 	  }
45     }
46 
47   __mutex_unlock (&_hurd_id.lock);
48   _hurd_critical_section_unlock (crit);
49   if (err == EINTR)
50     /* Got a signal while inside an RPC of the critical section, retry again */
51     goto retry;
52 
53   if (err)
54     __hurd_fail (err);
55   return member;
56 }
57 
58 weak_alias (__group_member, group_member)
59