sysdeps/mach/hurd/setgroups.c

   1 /* Copyright (C) 1993-2014 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 (n, groups)
  27      size_t n;
  28      const gid_t *groups;
  29 {
  30   error_t err;
  31   auth_t newauth;
  32   size_t i;
  33   gid_t new[n];
  34
  35   /* Fault before taking locks.  */
  36   for (i = 0; i < n; ++i)
  37     new[i] = groups[i];
  38
  39   HURD_CRITICAL_BEGIN;
  40   __mutex_lock (&_hurd_id.lock);
  41   err = _hurd_check_ids ();
  42   if (! err)
  43     {
  44       /* Get a new auth port using those IDs.  */
  45       err = __USEPORT (AUTH,
  46                        __auth_makeauth (port, NULL, MACH_MSG_TYPE_COPY_SEND, 0,
  47                                         _hurd_id.gen.uids, _hurd_id.gen.nuids,
  48                                         _hurd_id.aux.uids, _hurd_id.aux.nuids,
  49                                         new, n,
  50                                         _hurd_id.aux.gids, _hurd_id.aux.ngids,
  51                                         &newauth));
  52     }
  53   __mutex_unlock (&_hurd_id.lock);
  54   HURD_CRITICAL_END;
  55
  56   if (err)
  57     return __hurd_fail (err);
  58
  59   /* Install the new auth port and reauthenticate everything.  */
  60   err = __setauth (newauth);
  61   __mach_port_deallocate (__mach_task_self (), newauth);
  62   return err;
  63 }
  64 libc_hidden_def (setgroups)