1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" %sccs.include.redist.man% 9.\" 10.\" @(#)clock.3 8.1 (Berkeley) 06/04/93 11.\" 12.Dd 13.Dt CLOCK 3 14.Os 15.Sh NAME 16.Nm clock 17.Nd determine processor time used 18.Sh SYNOPSIS 19.Fd #include <sys/types.h> 20.Ft clock_t 21.Fn clock void 22.Sh DESCRIPTION 23The 24.Fn clock 25function 26determines the amount of processor time used since the invocation of the 27calling process, measured in 28.Dv CLK_TCK Ns s. 29.Sh RETURN VALUES 30The 31.Fn clock 32function returns the amount of time used unless an error occurs, in which 33case the return value is \-1. 34.Sh SEE ALSO 35.Xr getrusage 2 36.Sh STANDARDS 37The 38.Fn clock 39function conforms to 40.St -ansiC . 41