1.\" Copyright (c) 2000 Kelly Yancey 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.\" 27.Dd September 16, 2004 28.Dt MICROTIME 9 29.Os 30.Sh NAME 31.Nm bintime , 32.Nm getbintime , 33.Nm microtime , 34.Nm getmicrotime , 35.Nm nanotime , 36.Nm getnanotime 37.Nd get the current time 38.Sh SYNOPSIS 39.In sys/time.h 40.Ft void 41.Fn bintime "struct bintime *bt" 42.Ft void 43.Fn getbintime "struct bintime *bt" 44.Ft void 45.Fn microtime "struct timeval *tv" 46.Ft void 47.Fn getmicrotime "struct timeval *tv" 48.Ft void 49.Fn nanotime "struct timespec *ts" 50.Ft void 51.Fn getnanotime "struct timespec *tsp" 52.Sh DESCRIPTION 53The 54.Fn bintime 55and 56.Fn getbintime 57functions store the system time as a 58.Vt "struct bintime" 59at the addresses specified by 60.Fa bt . 61The 62.Fn microtime 63and 64.Fn getmicrotime 65functions perform the same utility, but record the time as a 66.Vt "struct timeval" 67instead. 68Similarly the 69.Fn nanotime 70and 71.Fn getnanotime 72functions store the time as a 73.Vt "struct timespec" . 74.Pp 75The 76.Fn bintime , 77.Fn microtime , 78and 79.Fn nanotime 80functions 81always query the timecounter to return the current time as precisely as 82possible. 83Whereas 84.Fn getbintime , 85.Fn getmicrotime , 86and 87.Fn getnanotime 88functions are abstractions which return a less precise, but 89faster to obtain, time. 90.Pp 91The intent of the 92.Fn getbintime , 93.Fn getmicrotime , 94and 95.Fn getnanotime 96functions is to enforce the user's preference for timer accuracy versus 97execution time. 98.Sh SEE ALSO 99.Xr binuptime 9 , 100.Xr getbinuptime 9 , 101.Xr getmicrouptime 9 , 102.Xr getnanouptime 9 , 103.Xr microuptime 9 , 104.Xr nanouptime 9 , 105.Xr tvtohz 9 106.Sh HISTORY 107The 108.Nm bintime 109functions first appeared in 110.Fx 5.0 . 111The 112.Nm microtime 113and 114.Nm nanotime 115functions first appeared in 116.Fx 3.0 117but have existed in other incarnations since 118.Bx 4.4 . 119.Sh AUTHORS 120This manual page was written by 121.An Kelly Yancey Aq Mt kbyanc@posi.net . 122