sysdeps/mach/hurd/setgroups.c

   1 /* Copyright (C) 1993-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   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    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <sys/types.h>
  20 #include <grp.h>
  21 #include <hurd.h>
  22 #include <hurd/id.h>
  23
  24 /* Set the group set for the current user to GROUPS (N of them).  */
  25 int
  26 setgroups (size_t n, const gid_t *groups)
  27 {
  28   error_t err;
  29   auth_t newauth;
  30   size_t i;
  31   gid_t new[n];
  32
  33   /* Fault before taking locks.  */
  34   for (i = 0; i < n; ++i)
  35     new[i] = groups[i];
  36
  37   HURD_CRITICAL_BEGIN;
  38   __mutex_lock (&_hurd_id.lock);
  39   err = _hurd_check_ids ();
  40   if (! err)
  41     {
  42       /* Get a new auth port using those IDs.  */
  43       err = __USEPORT (AUTH,
  44                        __auth_makeauth (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
  45                                         _hurd_id.gen.uids, _hurd_id.gen.nuids,
  46                                         _hurd_id.aux.uids, _hurd_id.aux.nuids,
  47                                         new, n,
  48                                         _hurd_id.aux.gids, _hurd_id.aux.ngids,
  49                                         &newauth));
  50     }
  51   __mutex_unlock (&_hurd_id.lock);
  52   HURD_CRITICAL_END;
  53
  54   if (err)
  55     return __hurd_fail (err);
  56
  57   /* Install the new auth port and reauthenticate everything.  */
  58   err = __setauth (newauth);
  59   __mach_port_deallocate (__mach_task_self (), newauth);
  60   return err;
  61 }
  62 libc_hidden_def (setgroups)