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glibc  2.9
seteuids.c
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00001 /* Copyright (C) 1993, 94, 97, 98 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <hurd.h>
00020 #include <hurd/id.h>
00021 
00022 /* Set the uid set for the current user to UIDS (N of them).  */
00023 int
00024 seteuids (int n, const uid_t *uids)
00025 {
00026   error_t err;
00027   auth_t newauth;
00028   int i;
00029   gid_t new[n];
00030 
00031   /* Fault before taking locks.  */
00032   for (i = 0; i < n; ++i)
00033     new[i] = uids[i];
00034 
00035   HURD_CRITICAL_BEGIN;
00036   __mutex_lock (&_hurd_id.lock);
00037   err = _hurd_check_ids ();
00038   if (! err)
00039     {
00040       /* Get a new auth port using those IDs.  */
00041       err = __USEPORT (AUTH,
00042                      __auth_makeauth (port, NULL, 0, 0,
00043                                    new, n,
00044                                    _hurd_id.aux.uids, _hurd_id.aux.nuids,
00045                                    _hurd_id.gen.gids, _hurd_id.gen.ngids,
00046                                    _hurd_id.aux.gids, _hurd_id.aux.ngids,
00047                                    &newauth));
00048     }
00049   __mutex_unlock (&_hurd_id.lock);
00050   HURD_CRITICAL_END;
00051 
00052   if (err)
00053     return __hurd_fail (err);
00054 
00055   /* Install the new auth port and reauthenticate everything.  */
00056   err = __setauth (newauth);
00057   __mach_port_deallocate (__mach_task_self (), newauth);
00058   return err;
00059 }