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authorSergio Carlavilla Delgado <carlavilla@FreeBSD.org>2021-01-25 23:31:29 +0000
committerSergio Carlavilla Delgado <carlavilla@FreeBSD.org>2021-01-25 23:31:29 +0000
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treea5d768f9af4b55422fdf5b17064879ae1c7ce032 /documentation/manual-pages/ja/man3/rand.3
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+.\" Copyright (c) 1990, 1991, 1993
+.\" The Regents of the University of California. All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" 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.
+.\"
+.\" @(#)rand.3 8.1 (Berkeley) 6/4/93
+.\" %FreeBSD: src/lib/libc/stdlib/rand.3,v 1.4.2.5 2001/12/14 18:33:58 ru Exp %
+.\" $FreeBSD$
+.\"
+.Dd May 25, 1999
+.Dt RAND 3
+.Os
+.Sh 名称
+.Nm rand ,
+.Nm srand ,
+.Nm rand_r
+.Nd 不十分な乱数ジェネレータ
+.Sh ライブラリ
+.Lb libc
+.Sh 書式
+.In stdlib.h
+.Ft void
+.Fn srand "unsigned seed"
+.Ft int
+.Fn rand void
+.Ft int
+.Fn rand_r "unsigned *ctx"
+.Sh 解説
+.Bf -symbolic
+このインタフェースは、
+.Xr random 3
+に置き換えられました。
+.Ef
+.Pp
+.Fn rand
+関数は、0 から
+.Dv RAND_MAX
+(ヘッダファイル
+.Aq Pa stdlib.h
+で定義) の範囲で、疑似乱整数のシーケンスを算出します。
+.Pp
+.Fn srand
+関数は、引数
+.Fa seed
+を、
+.Fn rand
+が戻す疑似乱数の新しいシーケンスの種として設定します。
+このシーケンスは、同じ値の種を用いて
+.Fn srand
+を呼び出すことで繰り返すことができます。
+.Pp
+.Fa 種
+の値を指定しないと、これらの関数は自動的に 1 を種として使用します。
+.Pp
+.Fn rand_r
+は、
+.Fn rand
+と同じ機能を提供します。
+コンテキスト毎の値である
+.Fa ctx
+へのポインタは、呼び出し側が提供する必要があります。
+.Sh 関連項目
+.Xr random 3
+.Sh 規格
+.Fn rand
+関数と
+.Fn srand
+関数は、
+.St -isoC
+に適合しています。
+.Pp
+.Fn rand_r
+関数は POSIX.4a Draft #6 ドキュメントで提案されています。