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/*
   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_reathenticate as described in <hurd/io.defs>. */
kern_return_t
diskfs_S_io_reauthenticate (struct protid *cred,
			    mach_port_t rend_port)
{
  struct protid *newcred;
  error_t err;
  mach_port_t newright;

  if (cred == 0)
    return EOPNOTSUPP;

  /* This routine must carefully ignore EINTR because we 
     are a simpleroutine, so callers won't know to restart. */

  mutex_lock (&cred->po->np->lock);
  do
    err = diskfs_start_protid (cred->po, &newcred);
  while (err == EINTR);
  if (err)
    {
      mutex_unlock (&cred->po->np->lock);
      return err;
    }

  newright = ports_get_right (newcred);
  err = mach_port_insert_right (mach_task_self (), newright, newright,
				MACH_MSG_TYPE_MAKE_SEND);
  assert_perror (err);

  diskfs_finish_protid (newcred, iohelp_reauth (diskfs_auth_server_port, 
						rend_port, newright, 1));
  mach_port_deallocate (mach_task_self (), rend_port);
  mach_port_deallocate (mach_task_self (), newright);
    
  mutex_unlock (&cred->po->np->lock);

  ports_port_deref (newcred);

  return 0;
}