.\" Copyright (c) 1990, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek and the American National Standards Committee X3,
.\" on Information Processing Systems.
.\"
.\" 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
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\"
.\"     @(#)atexit.3	8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt ATEXIT 3
.Os
.Sh 名称
.Nm atexit
.Nd 終了時に呼び出される関数を登録する
.Sh 書式
.Fd #include <stdlib.h>
.Ft int
.Fn atexit "void (*function)(void)"
.Sh 解説
.Fn atexit
関数は、
.Xr exit 3
によってであれ、プログラムのメイン関数の
戻りによってであれ、プログラム終了で呼び出される指定の
.Ar function
を登録します。このように登録された関数は、逆の順序に呼び出されます。
引数は渡されません。少なくとも
32 個の関数が常に登録でき、十分なメモリが割り
振りできる限り、それを超える関数も登録できます。
.Sh 戻り値
.\"X .Rv -std atexit
.Fn atexit
関数は、処理が成功すると値 0 を返します。そうでない場合、値 -1 が
返され、グローバル変数
.Fa errno
が設定されてエラーを示します。
.Sh エラー
.Bl -tag -width [ENOMEM]
.It Bq Er ENOMEM
関数をリストに追加するメモリが利用できませんでした。関数の既存の
リストは無修正です。
.El
.Sh 関連項目
.Xr exit 3
.Sh 規格
.Fn atexit
関数は
.St -ansiC
に準拠しています。
.\" kuma