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+.\" Copyright (c) 1985, 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.
+.\"
+.\"     @(#)getusershell.3	8.1 (Berkeley) 6/4/93
+.\" %FreeBSD: src/lib/libc/gen/getusershell.3,v 1.5.2.3 2001/12/14 18:33:51 ru Exp %
+.\" $FreeBSD$
+.\"
+.Dd June 4, 1993
+.Dt GETUSERSHELL 3
+.Os 
+.Sh 名称
+.Nm getusershell ,
+.Nm setusershell ,
+.Nm endusershell
+.Nd 正規ユーザシェルを取得
+.Sh ライブラリ
+.Lb libc
+.Sh 書式
+.In unistd.h
+.Ft char *
+.Fn getusershell void
+.Ft void
+.Fn setusershell void
+.Ft void
+.Fn endusershell void
+.Sh 解説
+.Fn getusershell
+関数は、システム管理者がファイル
+.Pa /etc/shells
+に定義している正規ユーザシェルのポインタを返します。
+.Pa /etc/shells
+が読み込めないかまたは存在しない場合、
+.Fn getusershell
+は、あたかも
+.Pa /bin/sh
+および
+.Pa /bin/csh
+がファイルにリストされていたかのように挙動します。
+.Pp
+.Fn getusershell
+関数は
+(必要ならばファイルをオープンして)
+次の行を読み込みます。
+.Fn setusershell
+関数はファイルの先頭まで戻り、
+.Fn endusershell
+関数はファイルをクローズします。
+.Sh 関連ファイル
+.Bl -tag -width /etc/shells -compact
+.It Pa /etc/shells
+.El
+.Sh 診断
+.Fn getusershell
+ルーチンは、
+.Dv EOF
+で
+ヌルポインタ (0) を返します。
+.Sh 関連項目
+.Xr shells 5
+.Sh 歴史
+.Fn getusershell
+関数は
+.Bx 4.3
+ではじめて登場しました。
+.Sh バグ
+.Fn getusershell
+関数は、処理結果を内部の静的オブジェクトに残し、その
+オブジェクトのポインタを返します。以後
+.Fn getusershell
+を呼び出すと、同じオブジェクトを変更します。