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+.\" Copyright (c) 1986, 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 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.
+.\"
+.\"     From: @(#)ualarm.3	8.2 (Berkeley) 4/19/94
+.\" %FreeBSD: src/lib/libc/gen/ualarm.3,v 1.9.2.5 2001/12/14 18:33:51 ru Exp %
+.\"
+.\" $FreeBSD$
+.Dd April 19, 1994
+.Dt UALARM 3
+.Os
+.Sh 名称
+.Nm ualarm
+.Nd 指定された時間後に信号発信を予定
+.Sh ライブラリ
+.Lb libc
+.Sh 書式
+.In unistd.h
+.Ft u_int
+.Fn ualarm "u_int microseconds" "u_int interval"
+.Sh 解説
+.Bf -symbolic
+これは
+.Xr setitimer 2
+への簡易化されたインタフェースです。
+.Ef
+.Pp
+.Fn ualarm
+関数は、
+.Ar microseconds
+のカウントだけ待ってから終了信号
+.Dv SIGALRM
+を出します。システム動作またはその呼び出し処理に使った
+時間によって、わずかな遅れが起きる場合があります。
+.Pp
+引数
+.Ar interval
+が非ゼロである場合は、タイマが切れた後 ( すなわち、
+.Fa value
+マイクロ秒が過ぎた後 ) の
+.Ar interval
+マイクロ秒毎に
+.Dv SIGALRM
+信号がプロセスに
+対して送られます。
+.Pp
+.Xr setitimer 2
+の制限によって、
+.Ar microseconds
+および
+.Ar interval
+の最大数は
+100000000000000 に制限されます ( この値が符号なし整数の範囲内に収まる
+場合 ) 。
+.Sh 戻り値
+信号がうまく受け取られた場合は、
+.Fn ualarm
+関数はクロックに残された時間数を返します。
+.Sh 注
+1 マイクロ秒は、0.000001 秒です。
+.Sh 関連項目
+.Xr getitimer 2 ,
+.Xr setitimer 2 ,
+.Xr sigpause 2 ,
+.Xr sigvec 2 ,
+.Xr alarm 3 ,
+.Xr signal 3 ,
+.Xr sleep 3 ,
+.Xr usleep 3
+.Sh 歴史
+.Fn ualarm
+関数は、
+.Bx 4.3
+に現れました。