/* 
   Copyright (C) 1994, 1995, 1996 Free Software Foundation

   This program 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.

   This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include "priv.h"
#include "io_S.h"

/* Implement io_duplicate as described in <hurd/io.defs>. */
kern_return_t
diskfs_S_io_duplicate (struct protid *cred,
		       mach_port_t *port,
		       mach_msg_type_name_t *portpoly)
{
  error_t err;
  struct protid *newpi;

  if (!cred)
    return EOPNOTSUPP;
  
  pthread_mutex_lock (&cred->po->np->lock);

  refcount_ref (&cred->po->refcnt);
  err = diskfs_create_protid (cred->po, cred->user, &newpi);
  if (! err)
    {
      *port = ports_get_right (newpi);
      *portpoly = MACH_MSG_TYPE_MAKE_SEND;
      ports_port_deref (newpi);
    }
  else
    refcount_deref (&cred->po->refcnt);

  pthread_mutex_unlock (&cred->po->np->lock);

  return err;
}