.\" Copyright (c) 1980, 1991, 1993
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.\"     @(#)getpid.2	8.1 (Berkeley) 6/4/93
.\" %FreeBSD: src/lib/libc/sys/getpid.2,v 1.8.2.1 2000/04/22 17:06:54 phantom Exp %
.\"
.Dd June 4, 1993
.Dt GETPID 2
.Os BSD 4
.Sh 名称
.Nm getpid ,
.Nm getppid
.Nd 親または呼び出しプロセスの識別子を取得
.Sh ライブラリ
.Lb libc
.Sh 書式
.Fd #include <sys/types.h>
.Fd #include <unistd.h>
.Ft pid_t
.Fn getpid void
.Ft pid_t
.Fn getppid void
.Sh 解説
.Fn getpid
は呼び出しプロセスのプロセス ID を返します。
ID はユニークであることが保証されており、
一時的なファイルの名前を作成するのに便利です。
.Pp
.Fn getppid
は呼び出しプロセスの親のプロセス ID を返します。
.Sh エラー
.Fn getpid
関数と
.Fn getppid
関数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 gethostid 3
.Sh 規格
.Fn getpid
関数と
.Fn getppid
関数は
.St -p1003.1-90
に準拠しています。
.Sh 歴史
.Fn getpid
関数は
.At v7
で登場しました。