Copyright (c) 1991, 1993
   The Regents of the University of California.  All rights reserved.
(c) UNIX System Laboratories, Inc.
All or some portions of this file are derived from material licensed
to the University of California by American Telephone and Telegraph
Co. or Unix System Laboratories, Inc. and are reproduced herein with
the permission of UNIX System Laboratories, Inc.

This code is derived from software contributed to Berkeley by
Hugh Smith at The University of Guelph.