101 lines
2.9 KiB
Groff
101 lines
2.9 KiB
Groff
.\" Copyright (c) 2000 Kelly Yancey
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" %FreeBSD: src/share/man/man9/microuptime.9,v 1.5.8.1 2004/09/22 04:43:33 brooks Exp %
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.\"
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.\" $FreeBSD$
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.Dd September, 16 2004
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.Dt MICROUPTIME 9
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.Os
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.Sh 名称
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.Nm binuptime ,
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.Nm getbinuptime ,
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.Nm microuptime ,
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.Nm getmicrouptime ,
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.Nm nanouptime ,
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.Nm getnanouptime
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.Nd 起動からの経過時間の取得
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.Sh 書式
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.In sys/time.h
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.Ft void
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.Fn binuptime "struct bintime *bt"
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.Ft void
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.Fn getbinuptime "struct bintime *bt"
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.Ft void
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.Fn microuptime "struct timeval *tv"
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.Ft void
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.Fn getmicrouptime "struct timeval *tv"
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.Ft void
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.Fn nanouptime "struct timespec *ts"
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.Ft void
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.Fn getnanouptime "struct timespec *tsp"
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.Sh 解説
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.Fn binuptime
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および
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.Fn getbinuptime
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関数は、
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.Fa bt
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によって指定されたアドレスに、
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.Ft bintime
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構造体として、起動からの経過時間を保存します。
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.Fn microuptime
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および
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.Fn getmicrouptime
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関数は、同等の機能を果たしますが、代りに
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.Ft timeval
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構造体として経過時間を記録します。
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同様に、
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.Fn nanouptime
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および
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.Fn getnanouptime
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関数は、
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.Ft timespec
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構造体として経過時間を保存します。
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.Pp
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.Fn binuptime ,
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.Fn microuptime ,
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.Fn nanouptime
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は、常に可能な限り正確な現在時刻を返す時刻カウンタを請求します。
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それに反して、
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.Fn getbinuptime ,
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.Fn getmicrouptime ,
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.Fn getnanouptime
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関数は、正確ではないが高速に得られる時刻を返す抽象化です。
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.Pp
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.Fn getbinuptime ,
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.Fn getmicrouptime ,
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.Fn getnanouptime
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関数の意図は、タイマの正確さ対実行時間のユーザの好みを強化することです。
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.Sh 関連項目
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.Xr bintime 9 ,
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.Xr getbintime 9 ,
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.Xr getmicrotime 9 ,
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.Xr getnanotime 9 ,
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.Xr microtime 9 ,
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.Xr nanotime 9 ,
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.Xr tvtohz 9
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.Sh 作者
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このマニュアルページは
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.An Kelly Yancey Aq kbyanc@posi.net
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が書きました。
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