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sourceware.org Git - glibc.git/blob - sysdeps/mach/hurd/seteuid.c
1 /* Copyright (C) 1993, 1994 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
16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
17 Cambridge, MA 02139, USA. */
23 #include <sys/types.h>
27 /* Set the effective user ID of the calling process to UID. */
29 DEFUN(seteuid
, (uid
), uid_t uid
)
35 __mutex_lock (&_hurd_id
.lock
);
36 err
= _hurd_check_ids ();
40 /* Make a new auth handle which has EUID as the first element in the
41 list of effective uids. */
43 size_t ngen
= _hurd_id
.gen
.nuids
< 1 ? 1 : _hurd_id
.gen
.nuids
;
47 memcpy (&newgen
[1], _hurd_id
.gen
.uids
, (ngen
- 1) * sizeof (uid_t
));
49 err
= __USEPORT (AUTH
, __auth_makeauth
50 (port
, NULL
, MACH_MSG_TYPE_COPY_SEND
, 0,
52 _hurd_id
.aux
.uids
, _hurd_id
.aux
.nuids
,
53 _hurd_id
.gen
.gids
, _hurd_id
.gen
.ngids
,
54 _hurd_id
.aux
.gids
, _hurd_id
.aux
.ngids
,
57 __mutex_unlock (&_hurd_id
.lock
);
61 return __hurd_fail (err
);
63 /* Install the new handle and reauthenticate everything. */
64 err
= __setauth (newauth
);
65 __mach_port_deallocate (__mach_task_self (), newauth
);
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