1 /* Copyright (C) 1992 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. */
24 /* Set the effective user ID of the calling process to UID. */
26 DEFUN(seteuid, (uid), int uid)
31 __mutex_lock (&_hurd_idlock);
34 error_t err = _HURD_PORT_USE (&_hurd_auth,
35 __auth_getids (port, &_hurd_id));
38 __mutex_unlock (&_hurd_idlock);
39 return __hurd_fail (err);
44 for (i = 0; i < _hurd_id.nuids; ++i)
45 if (_hurd_id.uids[i] == uid)
47 /* We already have this uid. Swap it with uids[0]
48 so geteuid will return it. */
49 _hurd_id.uids[i] = _hurd_id.uids[0];
53 if (i == _hurd_id.nuids)
55 if (_hurd_id.nuids == sizeof (_hurd_id.uids) / sizeof (_hurd_id.uids[0]))
57 __mutex_unlock (&_hurd_idlock);
58 errno = ENOMEM; /* ? */
63 _hurd_id.uids[_hurd_id.nuids++] = _hurd_id.uids[0];
64 _hurd_id.uids[0] = uid;
68 err = _HURD_PORT_USE (&_hurd_auth,
69 __auth_makeauth (port, &_hurd_id, &newauth));
71 __mutex_unlock (&_hurd_idlock);
74 return __hurd_fail (err);
76 err = __setauth (newauth);
77 __mach_port_deallocate (__mach_task_self (), newauth);