hurd/privports.c

   1 /* Copyright (C) 1993,94,97,2001 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, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <hurd.h>
  20
  21 /* The program might set these if it is the initial task
  22    bootstrapped by the microkernel.  */
  23
  24 mach_port_t _hurd_host_priv, _hurd_device_master;
  25
  26
  27 kern_return_t
  28 __get_privileged_ports (host_priv_t *host_priv_ptr,
  29                         device_t *device_master_ptr)
  30 {
  31   if ((host_priv_ptr && _hurd_host_priv == MACH_PORT_NULL)
  32       || (device_master_ptr && _hurd_device_master == MACH_PORT_NULL))
  33     {
  34       error_t err;
  35
  36       if (_hurd_ports)
  37         /* We have gotten some initial ports, so perhaps
  38            we have a proc server to talk to.  */
  39         err = __USEPORT (PROC, __proc_getprivports (port,
  40                                                     &_hurd_host_priv,
  41                                                     &_hurd_device_master));
  42       else
  43         return MACH_SEND_INVALID_DEST;
  44
  45       if (err)
  46         return err;
  47     }
  48
  49   if (host_priv_ptr)
  50     {
  51       error_t err = _hurd_host_priv == MACH_PORT_NULL ? 0
  52         : __mach_port_mod_refs (mach_task_self (),
  53                                 _hurd_host_priv, MACH_PORT_RIGHT_SEND, +1);
  54       if (err)
  55         return err;
  56       *host_priv_ptr = _hurd_host_priv;
  57     }
  58
  59   if (device_master_ptr)
  60     {
  61       error_t err = _hurd_device_master == MACH_PORT_NULL ? 0
  62         : __mach_port_mod_refs (mach_task_self (),
  63                                 _hurd_device_master, MACH_PORT_RIGHT_SEND, +1);
  64       if (err)
  65         return err;
  66       *device_master_ptr = _hurd_device_master;
  67     }
  68
  69   return KERN_SUCCESS;
  70 }
  71 weak_alias (__get_privileged_ports, get_privileged_ports)