158f0484fSRodney W. Grimes.\" Copyright (c) 1990, 1991, 1993 258f0484fSRodney W. Grimes.\" The Regents of the University of California. All rights reserved. 358f0484fSRodney W. Grimes.\" 458f0484fSRodney W. Grimes.\" This code is derived from software contributed to Berkeley by 558f0484fSRodney W. Grimes.\" the American National Standards Committee X3, on Information 658f0484fSRodney W. Grimes.\" Processing Systems. 758f0484fSRodney W. Grimes.\" 858f0484fSRodney W. Grimes.\" Redistribution and use in source and binary forms, with or without 958f0484fSRodney W. Grimes.\" modification, are permitted provided that the following conditions 1058f0484fSRodney W. Grimes.\" are met: 1158f0484fSRodney W. Grimes.\" 1. Redistributions of source code must retain the above copyright 1258f0484fSRodney W. Grimes.\" notice, this list of conditions and the following disclaimer. 1358f0484fSRodney W. Grimes.\" 2. Redistributions in binary form must reproduce the above copyright 1458f0484fSRodney W. Grimes.\" notice, this list of conditions and the following disclaimer in the 1558f0484fSRodney W. Grimes.\" documentation and/or other materials provided with the distribution. 16*fbbd9655SWarner Losh.\" 3. Neither the name of the University nor the names of its contributors 1758f0484fSRodney W. Grimes.\" may be used to endorse or promote products derived from this software 1858f0484fSRodney W. Grimes.\" without specific prior written permission. 1958f0484fSRodney W. Grimes.\" 2058f0484fSRodney W. Grimes.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 2158f0484fSRodney W. Grimes.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2258f0484fSRodney W. Grimes.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2358f0484fSRodney W. Grimes.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 2458f0484fSRodney W. Grimes.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2558f0484fSRodney W. Grimes.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2658f0484fSRodney W. Grimes.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2758f0484fSRodney W. Grimes.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2858f0484fSRodney W. Grimes.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2958f0484fSRodney W. Grimes.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3058f0484fSRodney W. Grimes.\" SUCH DAMAGE. 3158f0484fSRodney W. Grimes.\" 3258f0484fSRodney W. Grimes.Dd June 4, 1993 3358f0484fSRodney W. Grimes.Dt CLOCK 3 3458f0484fSRodney W. Grimes.Os 3558f0484fSRodney W. Grimes.Sh NAME 3658f0484fSRodney W. Grimes.Nm clock 3758f0484fSRodney W. Grimes.Nd determine processor time used 3825bb73e0SAlexey Zelkin.Sh LIBRARY 3925bb73e0SAlexey Zelkin.Lb libc 4058f0484fSRodney W. Grimes.Sh SYNOPSIS 4132eef9aeSRuslan Ermilov.In time.h 4258f0484fSRodney W. Grimes.Ft clock_t 4358f0484fSRodney W. Grimes.Fn clock void 4458f0484fSRodney W. Grimes.Sh DESCRIPTION 4558f0484fSRodney W. GrimesThe 4658f0484fSRodney W. Grimes.Fn clock 4758f0484fSRodney W. Grimesfunction 4858f0484fSRodney W. Grimesdetermines the amount of processor time used since the invocation of the 4958f0484fSRodney W. Grimescalling process, measured in 507e1b8179SDavid Malone.Dv CLOCKS_PER_SEC Ns s 51711fbb0aSBruce Evansof a second. 5258f0484fSRodney W. Grimes.Sh RETURN VALUES 5358f0484fSRodney W. GrimesThe 5458f0484fSRodney W. Grimes.Fn clock 5558f0484fSRodney W. Grimesfunction returns the amount of time used unless an error occurs, in which 5658f0484fSRodney W. Grimescase the return value is \-1. 5758f0484fSRodney W. Grimes.Sh SEE ALSO 589cb8a105SJoerg Wunsch.Xr getrusage 2 , 599cb8a105SJoerg Wunsch.Xr clocks 7 6058f0484fSRodney W. Grimes.Sh STANDARDS 6158f0484fSRodney W. GrimesThe 6258f0484fSRodney W. Grimes.Fn clock 6358f0484fSRodney W. Grimesfunction conforms to 64588a200cSRuslan Ermilov.St -isoC . 657e1b8179SDavid MaloneHowever, 667e1b8179SDavid Malone.St -susv2 677e1b8179SDavid Malonerequires 687e1b8179SDavid Malone.Dv CLOCKS_PER_SEC 697e1b8179SDavid Maloneto be defined as one million. 707e1b8179SDavid Malone.Fx 717e1b8179SDavid Malonedoes not conform to this requirement; 727e1b8179SDavid Malonechanging the value would introduce binary incompatibility 737e1b8179SDavid Maloneand one million is still inadequate on modern processors. 74