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git.ipfire.org Git - thirdparty/glibc.git/blob - sysdeps/mach/hurd/setgid.c
1 /* Copyright (C) 1991-2016 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/>. */
20 #include <sys/types.h>
25 /* Set the group ID of the calling process to UID.
26 If the calling process is the super-user, the real
27 and effective group IDs, and the saved set-group-ID to UID;
28 if not, the effective group ID is set to GID. */
36 __mutex_lock (&_hurd_id
.lock
);
37 err
= _hurd_check_ids ();
41 /* Make a new auth handle which has GID as the real gid,
42 and as the first element in the list of effective gids. */
44 gid_t
*newgen
, *newaux
, auxbuf
[2];
47 if (_hurd_id
.gen
.ngids
== 0)
49 /* No effective gids now. The new set will be just GID. */
55 _hurd_id
.gen
.gids
[0] = gid
;
57 newgen
= _hurd_id
.gen
.gids
;
58 ngen
= _hurd_id
.gen
.ngids
;
61 newaux
= _hurd_id
.aux
.gids
;
62 naux
= _hurd_id
.aux
.ngids
;
63 if (_hurd_id
.gen
.nuids
> 0 && _hurd_id
.gen
.uids
[0] == 0)
65 /* We are root; set the real and saved IDs too. */
67 if (_hurd_id
.aux
.ngids
< 2)
72 newaux
[0] = newaux
[1] = gid
;
75 err
= __USEPORT (AUTH
, __auth_makeauth
76 (port
, NULL
, MACH_MSG_TYPE_COPY_SEND
, 0,
77 _hurd_id
.gen
.uids
, _hurd_id
.gen
.nuids
,
78 _hurd_id
.aux
.uids
, _hurd_id
.aux
.nuids
,
79 newgen
, ngen
, newaux
, naux
,
82 __mutex_unlock (&_hurd_id
.lock
);
86 return __hurd_fail (err
);
88 /* Install the new handle and reauthenticate everything. */
89 err
= __setauth (newauth
);
90 __mach_port_deallocate (__mach_task_self (), newauth
);
94 weak_alias (__setgid
, setgid
)