/* Copy a mom port reference
   Copyright (C) 1996 Free Software Foundation, Inc.
   Written by Michael I. Bushnell, p/BSG.

   This file is part of the GNU Hurd.

   The GNU Hurd is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   The GNU Hurd is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */

#include "priv.h"

error_t
mom_copy_ref (struct mom_port_ref *new, 
	      struct mom_port_ref *obj)
{
  error_t err;
  
  new->lock = SPIN_LOCK_INITIALIZER;

  spin_lock (&obj->lock);
  assert (obj->refcnt);
  err = mach_port_mod_refs (mach_task_self (), 
			    obj->port, MACH_PORT_RIGHT_SEND, 1);
  new->port = obj->port;
  spin_unlock (&obj->lock);

  if (err)
    return err;
  
  new->refcnt = 1;
  return 0;
}