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+.\" Copyright (c) 1980, 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.
+.\"
+.\"     @(#)getuid.2	8.1 (Berkeley) 6/4/93
+.\" %FreeBSD: src/lib/libc/sys/getuid.2,v 1.12 2002/12/18 09:22:30 ru Exp %
+.\"
+.\" $FreeBSD$
+.Dd June 4, 1993
+.Dt GETUID 2
+.Os
+.Sh 名称
+.Nm getuid ,
+.Nm geteuid
+.Nd ユーザ識別子を得る
+.Sh ライブラリ
+.Lb libc
+.Sh 書式
+.In unistd.h
+.In sys/types.h
+.Ft uid_t
+.Fn getuid void
+.Ft uid_t
+.Fn geteuid void
+.Sh 解説
+.Fn getuid
+システムコールは、呼び出しプロセスの実ユーザ ID を返します。
+.Fn geteuid
+システムコールは、呼び出しプロセスの実効ユーザ ID を返します。
+.Pp
+実ユーザ ID は、プログラムを起動したユーザの ID です。
+実効ユーザ ID は、
+.Dq Em ユーザ ID 設定
+モードプロセスの実行中にプロセスに追加のパーミッションを与えるので、
+.Fn getuid
+を使用して呼び出しプロセスの実ユーザ ID を把握します。
+.Sh エラー
+.Fn getuid
+システムコールと
+.Fn geteuid
+システムコールは必ず正常に完了するので、エラーを示すための戻り値はありません。
+.Sh 関連項目
+.Xr getgid 2 ,
+.Xr issetugid 2 ,
+.Xr setgid 2 ,
+.Xr setreuid 2 ,
+.Xr setuid 2
+.Sh 規格
+.Fn geteuid
+システムコールと
+.Fn getuid
+システムコールは
+.St -p1003.1-90
+に適合しています。
+.Sh 歴史
+.Fn getuid
+関数と
+.Fn geteuid
+関数は
+.At v7
+ではじめて登場しました。