1Copyright (c) 1991, 1993 2 The Regents of the University of California. All rights reserved. 3(c) UNIX System Laboratories, Inc. 4All or some portions of this file are derived from material licensed 5to the University of California by American Telephone and Telegraph 6Co. or Unix System Laboratories, Inc. and are reproduced herein with 7the permission of UNIX System Laboratories, Inc. 8 9This code is derived from software contributed to Berkeley by 10Hugh Smith at The University of Guelph. 11