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- /* Copyright (C) 1993, 1994 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 675 Mass Ave,
- Cambridge, MA 02139, USA. */
-
- #include <ansidecl.h>
- #include <errno.h>
- #include <sys/types.h>
- #include <unistd.h>
- #include <hurd.h>
- #include <hurd/id.h>
-
- int
- __setreuid (uid_t ruid, uid_t euid)
- {
- auth_t newauth;
- error_t err;
-
- HURD_CRITICAL_BEGIN;
- __mutex_lock (&_hurd_id.lock);
- err = _hurd_check_ids ();
-
- if (!err)
- {
- /* Make a new auth handle which has RUID as the real uid,
- and EUID as the first element in the list of effective uids. */
-
- size_t ngen = _hurd_id.gen.nuids < 1 ? 1 : _hurd_id.gen.nuids;
- size_t naux = _hurd_id.aux.nuids < 1 ? 1 : _hurd_id.aux.nuids;
- uid_t newaux[naux], newgen[ngen];
-
- newgen[0] = euid;
- memcpy (&newgen[1], _hurd_id.gen.uids, (ngen - 1) * sizeof (uid_t));
- newaux[0] = ruid;
- memcpy (&newaux[1], _hurd_id.aux.uids, (naux - 1) * sizeof (uid_t));
-
- err = __USEPORT (AUTH, __auth_makeauth
- (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
- newgen, ngen,
- newaux, naux,
- _hurd_id.gen.gids, _hurd_id.gen.ngids,
- _hurd_id.aux.gids, _hurd_id.aux.ngids,
- &newauth));
- }
- __mutex_unlock (&_hurd_id.lock);
- HURD_CRITICAL_END;
-
- if (err)
- return __hurd_fail (err);
-
- /* Install the new handle and reauthenticate everything. */
- err = __setauth (newauth);
- __mach_port_deallocate (__mach_task_self (), newauth);
- return err;
- }
-