hurd/privports.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
  20 /* The program might set these if it is the initial task
  21    bootstrapped by the microkernel.  */
  22
  23 mach_port_t _hurd_host_priv, _hurd_device_master;
  24
  25
  26 kern_return_t
  27 __get_privileged_ports (mach_port_t *host_priv_ptr,
  28                         device_t *device_master_ptr)
  29 {
  30   if ((host_priv_ptr && _hurd_host_priv == MACH_PORT_NULL)
  31       || (device_master_ptr && _hurd_device_master == MACH_PORT_NULL))
  32     {
  33       error_t err;
  34
  35       if (_hurd_ports)
  36         /* We have gotten some initial ports, so perhaps
  37            we have a proc server to talk to.  */
  38         err = __USEPORT (PROC, __proc_getprivports (port,
  39                                                     &_hurd_host_priv,
  40                                                     &_hurd_device_master));
  41       else
  42         return MACH_SEND_INVALID_DEST;
  43
  44       if (err)
  45         return err;
  46     }
  47
  48   if (host_priv_ptr)
  49     {
  50       error_t err = _hurd_host_priv == MACH_PORT_NULL ? 0
  51         : __mach_port_mod_refs (mach_task_self (),
  52                                 _hurd_host_priv, MACH_PORT_RIGHT_SEND, +1);
  53       if (err)
  54         return err;
  55       *host_priv_ptr = _hurd_host_priv;
  56     }
  57
  58   if (device_master_ptr)
  59     {
  60       error_t err = _hurd_device_master == MACH_PORT_NULL ? 0
  61         : __mach_port_mod_refs (mach_task_self (),
  62                                 _hurd_device_master, MACH_PORT_RIGHT_SEND, +1);
  63       if (err)
  64         return err;
  65       *device_master_ptr = _hurd_device_master;
  66     }
  67
  68   return KERN_SUCCESS;
  69 }
  70 weak_alias (__get_privileged_ports, get_privileged_ports)