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+.\" Copyright (c) 1989, 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.
+.\"
+.\" @(#)pwcache.3 8.1 (Berkeley) 6/9/93
+.\" %FreeBSD: src/lib/libc/gen/pwcache.3,v 1.6.2.4 2001/12/14 18:33:51 ru Exp %
+.\"
+.\" $FreeBSD$
+.Dd June 9, 1993
+.Dt PWCACHE 3
+.Os
+.Sh 名称
+.Nm pwcache
+.Nd パスワードエントリとグループエントリのキャッシュ
+.Sh ライブラリ
+.Lb libc
+.Sh 書式
+.In stdlib.h
+.Ft char *
+.Fn user_from_uid "unsigned long uid" "int nouser"
+.Ft char *
+.Fn group_from_gid "unsigned long gid" "int nogroup"
+.Sh 解説
+.Fn user_from_uid
+関数は、引数
+.Fa uid
+に関連するユーザ名を戻します。ユーザ名はキャッシュされるので、同じ
+.Fa uid
+で何度も呼び出す場合は、
+.Xr getpwuid 3
+を呼び出す必要はありません。
+.Fa uid
+にユーザが関連していない場合は、引数
+.Fa nouser
+が 0 であれば、
+.Fa uid
+のストリング表現にポインタが戻されます。0 以外である場合は
+.Dv NULL
+ポインタが戻されます。
+.Pp
+.Fn group_from_gid
+関数は、引数
+.Fa gid
+に関連するグループ名を戻します。グループ名はキャッシュされるので、同じ
+.Fa gid
+で何度も呼び出す場合は、
+.Xr getgrgid 3
+を呼び出す必要はありません。
+.Fa gid
+にグループが関連していない場合は、引数
+.Fa nogroup
+が 0 であれば、
+.Fa gid
+のストリング表現にポインタが戻されます。0 以外である場合は
+.Dv NULL
+ポインタが戻されます。
+.Sh 関連項目
+.Xr getgrgid 3 ,
+.Xr getpwuid 3
+.Sh 歴史
+.Fn user_from_uid
+関数と
+.Fn group_from_gid
+関数は、
+.Bx 4.4
+ではじめて登場しました。