.\" Copyright (c) 1990, 1991 The Regents of the University of California.
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" %sccs.include.redist.man%
.\" @(#)clock.3 5.4 (Berkeley) %G%
.Nd determine processor time used
.Fd #include <sys/types.h>
determines the amount of processor time used since the invocation of the
calling process, measured in
function returns the amount of time used unless an error occurs, in which
case the return value is \-1.