/*
   Copyright (C) 1993, 1994 Free Software Foundation

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 the GNU Hurd; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* Written by Michael I. Bushnell.  */

#include "priv.h"

error_t
trivfs_S_fsys_getroot (mach_port_t fsys,
		       int flags,
		       uid_t *uids, u_int nuids,
		       uid_t *gids, u_int ngids,
		       mach_port_t *newpt,
		       mach_msg_type_name_t *newpttype)
{
  struct protid *cred;
  int i;

  assert (!trivfs_support_read && !trivfs_support_write
	  && !trivfs_support_exec);
  
  if (flags & (O_READ|O_WRITE|O_EXEC))
    return EACCES;
  
  cred = ports_allocate_port (sizeof (struct protid), PT_PROTID);
  cred->isroot = 0;
  for (i = 0; i < nuids; i++)
    if (uids[i] == 0)
      cred->isroot = 1;
  io_restrict_auth (trivfs_underlying_node, &cred->realnod, 
		    uids, nuids, gids, ngids);
  *newpt = ports_get_right (cred);
  *newpttype = MACH_MSG_TYPE_MAKE_SEND;
  return 0;
}