hurd/hurdid.c

   1 /* Copyright (C) 1993-2017 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 <hurd.h>
  19 #include <hurd/id.h>
  20
  21 struct hurd_id_data _hurd_id;
  22
  23
  24 /* Check that _hurd_id.{gen,aux} are valid and update them if not.
  25    Expects _hurd_id.lock to be held and does not release it.  */
  26
  27 error_t
  28 _hurd_check_ids (void)
  29 {
  30   if (! _hurd_id.valid)
  31     {
  32       inline void dealloc (__typeof (_hurd_id.gen) *p)
  33         {
  34           if (p->uids)
  35             {
  36               __vm_deallocate (__mach_task_self (),
  37                                (vm_address_t) p->uids,
  38                                p->nuids * sizeof (uid_t));
  39               p->uids = NULL;
  40             }
  41           p->nuids = 0;
  42           if (p->gids)
  43             {
  44               __vm_deallocate (__mach_task_self (),
  45                                (vm_address_t) p->gids,
  46                                p->ngids * sizeof (gid_t));
  47               p->gids = NULL;
  48             }
  49           p->ngids = 0;
  50         }
  51
  52       error_t err;
  53
  54       dealloc (&_hurd_id.gen);
  55       dealloc (&_hurd_id.aux);
  56
  57       if (_hurd_id.rid_auth != MACH_PORT_NULL)
  58         {
  59           __mach_port_deallocate (__mach_task_self (), _hurd_id.rid_auth);
  60           _hurd_id.rid_auth = MACH_PORT_NULL;
  61         }
  62
  63       if (err = __USEPORT (AUTH, __auth_getids
  64                            (port,
  65                             &_hurd_id.gen.uids, &_hurd_id.gen.nuids,
  66                             &_hurd_id.aux.uids, &_hurd_id.aux.nuids,
  67                             &_hurd_id.gen.gids, &_hurd_id.gen.ngids,
  68                             &_hurd_id.aux.gids, &_hurd_id.aux.ngids)))
  69         return err;
  70
  71       _hurd_id.valid = 1;
  72     }
  73
  74   return 0;
  75 }
  76
  77 static void
  78 init_id (void)
  79 {
  80   __mutex_init (&_hurd_id.lock);
  81   _hurd_id.valid = 0;
  82   _hurd_id.rid_auth = MACH_PORT_NULL;
  83   _hurd_id.gen.uids = _hurd_id.aux.uids = NULL;
  84   _hurd_id.gen.nuids = _hurd_id.aux.nuids = 0;
  85   _hurd_id.gen.gids = _hurd_id.aux.gids = NULL;
  86   _hurd_id.gen.ngids = _hurd_id.aux.ngids = 0;
  87
  88   (void) &init_id;              /* Avoid "defined but not used" warning.  */
  89 }
  90 text_set_element (_hurd_preinit_hook, init_id);