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+.\" Copyright (c) 1983, 1991, 1993, 1994
+.\"	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.
+.\"
+.\"     @(#)setgroups.2	8.2 (Berkeley) 4/16/94
+.\" %FreeBSD: src/lib/libc/sys/setgroups.2,v 1.13 2003/11/19 13:05:50 dds Exp %
+.\"
+.\" $FreeBSD$
+.Dd April 16, 1994
+.Dt SETGROUPS 2
+.Os
+.Sh 名称
+.Nm setgroups
+.Nd グループアクセスリストを設定する
+.Sh ライブラリ
+.Lb libc
+.Sh 書式
+.In sys/param.h
+.In unistd.h
+.Ft int
+.Fn setgroups "int ngroups" "const gid_t *gidset"
+.Sh 解説
+.Fn setgroups
+システムコールは、配列
+.Fa gidset
+に従って、現在のユーザプロセスのグループアクセスリストを設定します。
+.Fa ngroups
+引数は、配列内のエントリの数を示し、
+.In sys/param.h
+内に定義されている値
+.Dv NGROUPS
+を超えてはいけません。
+.Pp
+スーパユーザだけが新しいグループを設定できます。
+.Sh 戻り値
+.Rv -std setgroups
+.Sh エラー
+.Fn setgroups
+システムコールは次の場合に処理に失敗します:
+.Bl -tag -width Er
+.It Bq Er EPERM
+スーパユーザ以外のユーザによって呼び出されました。
+.It Bq Er EINVAL
+.Fa ngroups
+引数で指定された数値が
+.Dv NGROUPS
+の制限を越えています。
+.It Bq Er EFAULT
+.Fa gidset
+に指定されたアドレスは、
+プロセスに割り当てられたアドレス空間の範囲外を指しています。
+.El
+.Sh 関連項目
+.Xr getgroups 2 ,
+.Xr initgroups 3
+.Sh 歴史
+.Fn setgroups
+システムコールは
+.Bx 4.2
+で登場しました。