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Diffstat (limited to 'lib/libc/gen/clock.3')
-rw-r--r-- | lib/libc/gen/clock.3 | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/lib/libc/gen/clock.3 b/lib/libc/gen/clock.3 new file mode 100644 index 0000000..6a585e5 --- /dev/null +++ b/lib/libc/gen/clock.3 @@ -0,0 +1,76 @@ +.\" Copyright (c) 1990, 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" This code is derived from software contributed to Berkeley by +.\" the American National Standards Committee X3, on Information +.\" Processing Systems. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)clock.3 8.1 (Berkeley) 6/4/93 +.\" $FreeBSD$ +.\" +.Dd June 4, 1993 +.Dt CLOCK 3 +.Os +.Sh NAME +.Nm clock +.Nd determine processor time used +.Sh LIBRARY +.Lb libc +.Sh SYNOPSIS +.In time.h +.Ft clock_t +.Fn clock void +.Sh DESCRIPTION +The +.Fn clock +function +determines the amount of processor time used since the invocation of the +calling process, measured in +.Dv CLOCKS_PER_SEC Ns s +of a second. +.Sh RETURN VALUES +The +.Fn clock +function returns the amount of time used unless an error occurs, in which +case the return value is \-1. +.Sh SEE ALSO +.Xr getrusage 2 , +.Xr clocks 7 +.Sh STANDARDS +The +.Fn clock +function conforms to +.St -isoC . +However, +.St -susv2 +requires +.Dv CLOCKS_PER_SEC +to be defined as one million. +.Fx +does not conform to this requirement; +changing the value would introduce binary incompatibility +and one million is still inadequate on modern processors. |