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/*

 *  fchdir() - compatible with SVr4, 4.4BSD and X/OPEN - Change Directory

 *

 *  COPYRIGHT (c) 1989-2000.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  fchdir.c,v 1.5 2002/01/04 18:29:36 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <unistd.h>

#include <sys/stat.h>

#include <errno.h>

#include <rtems.h>

#include <rtems/libio.h>

#include <rtems/libio_.h>

#include <rtems/seterr.h>

int fchdir(

  int       fd

)

{

  rtems_libio_t *iop;

  rtems_libio_check_fd( fd );

  iop = rtems_libio_iop( fd );

  rtems_libio_check_is_open(iop);

  /*

   *  Now process the fchmod().

   */

  rtems_libio_check_permissions( iop, LIBIO_FLAGS_READ );

  /*

   * Verify you can change directory into this node.

   */

  if ( !iop->pathinfo.ops ) {

    rtems_set_errno_and_return_minus_one( ENOTSUP );

  }

  if ( !iop->pathinfo.ops->node_type_h ) {

    rtems_set_errno_and_return_minus_one( ENOTSUP );

  }

  if (  (*iop->pathinfo.ops->node_type_h)( &iop->pathinfo ) !=

                                          RTEMS_FILESYSTEM_DIRECTORY ) {

    rtems_set_errno_and_return_minus_one( ENOTDIR );

  }

  rtems_filesystem_freenode( &rtems_filesystem_current );

  /*

   * FIXME : I feel there should be another call to

   *         actually take into account the extra reference to

   *         this node which we are making here. I can

   *         see the freenode interface but do not see

   *         allocnode node interface. It maybe node_type.

   */

  rtems_filesystem_current = iop->pathinfo;

  return 0;

}