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- /* Copyright (C) 1991, 1992, 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 <unistd.h>
- #include <sys/types.h>
- #include <hurd.h>
- #include <hurd/id.h>
-
- /* Set the user ID of the calling process to UID.
- If the calling process is the super-user, the real
- and effective user IDs, and the saved set-user-ID to UID;
- if not, the effective user ID is set to UID. */
- int
- DEFUN(__setuid, (uid), uid_t uid)
- {
- 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 UID as the real uid,
- and as the first element in the list of effective uids. */
-
- uid_t newgen[_hurd_id.gen.nuids + 1];
- uid_t newaux[_hurd_id.aux.nuids];
-
- newgen[0] = uid;
- memcpy (&newgen[1], _hurd_id.gen.uids,
- _hurd_id.gen.nuids * sizeof (uid_t));
- newaux[0] = uid;
- memcpy (&newaux[1], _hurd_id.aux.uids,
- (_hurd_id.aux.nuids - 1) * sizeof (uid_t));
-
- err = __USEPORT (AUTH, __auth_makeauth
- (port, NULL, 0, MACH_MSG_TYPE_COPY_SEND,
- _hurd_id.gen.uids, _hurd_id.gen.nuids,
- _hurd_id.aux.uids, _hurd_id.aux.nuids,
- newgen, 1 + _hurd_id.gen.nuids,
- newaux, _hurd_id.aux.nuids,
- &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;
- }
-