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.Dd February 21, 2015 26.Dt MICROUPTIME 9 27.Os 28.Sh NAME 29.Nm binuptime , 30.Nm getbinuptime , 31.Nm microuptime , 32.Nm getmicrouptime , 33.Nm nanouptime , 34.Nm getnanouptime , 35.Nm sbinuptime , 36.Nm getsbinuptime 37.Nd get the time elapsed since boot 38.Sh SYNOPSIS 39.In sys/time.h 40.Ft void 41.Fn binuptime "struct bintime *bt" 42.Ft void 43.Fn getbinuptime "struct bintime *bt" 44.Ft void 45.Fn microuptime "struct timeval *tv" 46.Ft void 47.Fn getmicrouptime "struct timeval *tv" 48.Ft void 49.Fn nanouptime "struct timespec *ts" 50.Ft void 51.Fn getnanouptime "struct timespec *tsp" 52.Ft sbintime_t 53.Fn sbinuptime "void" 54.Ft sbintime_t 55.Fn getsbinuptime "void" 56.Sh DESCRIPTION 57The 58.Fn binuptime 59and 60.Fn getbinuptime 61functions store the time elapsed since boot as a 62.Vt "struct bintime" 63at the address specified by 64.Fa bt . 65The 66.Fn microuptime 67and 68.Fn getmicrouptime 69functions perform the same utility, but record the elapsed time as a 70.Vt "struct timeval" 71instead. 72Similarly the 73.Fn nanouptime 74and 75.Fn getnanouptime 76functions store the elapsed time as a 77.Vt "struct timespec" . 78The 79.Fn sbinuptime 80and 81.Fn getsbinuptime 82functions return the time elapsed since boot as a 83.Vt "sbintime_t" . 84.Pp 85The 86.Fn binuptime , 87.Fn microuptime , 88.Fn nanouptime , 89and 90.Fn sbinuptime 91functions 92always query the timecounter to return the current time as precisely as 93possible. 94Whereas 95.Fn getbinuptime , 96.Fn getmicrouptime , 97.Fn getnanouptime , 98and 99.Fn getsbinuptime 100functions are abstractions which return a less precise, but 101faster to obtain, time. 102.Pp 103The intent of the 104.Fn getbinuptime , 105.Fn getmicrouptime , 106.Fn getnanouptime , 107and 108.Fn getsbinuptime 109functions is to enforce the user's preference for timer accuracy versus 110execution time. 111.Sh SEE ALSO 112.Xr bintime 9 , 113.Xr get_cyclecount 9 , 114.Xr getbintime 9 , 115.Xr getmicrotime 9 , 116.Xr getnanotime 9 , 117.Xr microtime 9 , 118.Xr nanotime 9 , 119.Xr tvtohz 9 120.Sh AUTHORS 121This manual page was written by 122.An Kelly Yancey Aq Mt kbyanc@posi.net . 123