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.\"	@(#)munmap.2	8.3 (Berkeley) 5/27/94
.\" %FreeBSD: src/lib/libc/sys/munmap.2,v 1.19 2003/11/10 08:02:05 des Exp %
.\"
.\" $FreeBSD$
.Dd May 27, 1994
.Dt MUNMAP 2
.Os
.Sh 名称
.Nm munmap
.Nd マッピングを除去する
.Sh ライブラリ
.Lb libc
.Sh 書式
.In sys/mman.h
.Ft int
.Fn munmap "void *addr" "size_t len"
.Sh 解説
.Fn munmap
システムコールは指定アドレス範囲についてマッピングを除去します。
これにより、以降のこのアドレス範囲内への参照は
無効なメモリ参照を引き起こすようになります。
.Sh 戻り値
.Rv -std munmap
.Sh エラー
.Fn munmap
システムコールは次の場合に失敗します:
.Bl -tag -width Er
.It Bq Er EINVAL
.Fa addr
引数がページ境界に整列していなかったか、
.Fa len
引数が 0 か負であったか、またはアンマップする領域の一部が
プロセスにとって有効な範囲外にあります。
.El
.Sh 関連項目
.Xr madvise 2 ,
.Xr mincore 2 ,
.Xr mmap 2 ,
.Xr mprotect 2 ,
.Xr msync 2 ,
.Xr getpagesize 3
.Sh 歴史
.Fn munmap
システムコールは
.Bx 4.4
ではじめて登場しました。