.\" Copyright (c) 1983, 1991 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.
.\"
.\"     @(#)getpgrp.2	6.4 (Berkeley) 3/10/91
.\"
.\" Modified Sat Jul 24 01:15:33 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified 15 April 1995 by Michael Chastain <mec@shell.portal.com>:
.\"   Added 'getpgid'.
.\" Modified 21 July 1996 by Andries Brouwer <aeb@cwi.nl>
.\" Modified 21 July 1996 by Andries Brouwer <aeb@cwi.nl>
.\" Modified Wed Nov  6 04:02:50 1996 by Eric S. Raymond <esr@thyrsus.com>
.\" FIXME -- error conditions need to be better documented, see kernel
.\" Modified Thu Sep  2 13:55:37 1999 by Michael Haardt <michael@moria.de>
.\"
.\" Japanese Version Copyright (c) 1997-1999 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Sun Nov 21 18:54:10 JST 1999
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\"
.\"WORD:	process group		ץ롼
.\"WORD:	process group ID	ץ롼ID
.\"WORD:	library			饤֥
.\"WORD:	signal			ʥ
.\"WORD:	process			ץ
.\"WORD:	terminal		ü
.\"WORD:	foreground		ե
.\"WORD:	block			(block)
.\"WORD:	job control		֡ȥ
.\"WORD:	session			å
.\"
.TH SETPGID 2 "September 2, 1999" "Linux" "Linux Programmer's Manual"
.SH ̾
setpgid, getpgid, setpgrp, getpgrp \- ץ롼(process group)/Ԥʤ
.SH 
.B #include <unistd.h>
.sp
.BI "int setpgid(pid_t " pid ", pid_t " pgid );
.br
.BI "pid_t getpgid(pid_t " pid );
.br
.B int setpgrp(void);
.br
.B pid_t getpgrp(void);
.SH 
.B setpgid

.I pid
ǻꤷץΥץ롼ID 
.IR pgid
ꤹ롣
⤷
.I pid
ʤСƤӽФץΥץID  pid ȤƻѤ롣⤷
.I pgid
ʤС
.I pid
ǻꤵ줿ץΥץID  pgid ȤƻѤ롣
\fBsetpgid\fP ץ򤢤ץ롼פ̤Υ롼פ
ư뤿˻Ѥ(Υϥѥץ饤
ˤԤ)ξΥץ롼פƱå
ǤʤФʤʤξ \fIpgid\fP ϻä٤¸
ץ롼פꤷΥå ID ϻäץ
å ID ˰פʤФʤʤ

.B getpgid

.IR pid
ǻꤵ줿ץΥץ롼ID ֤
⤷
.I pid
ʤСƤӽФץΥץID  pid ȤƻѤ롣

Linux DLL 4.4.1 饤֥Ǥ
.B setpgrp
ñ
.BR setpgid(0,0)
ƤӽФ

.B getpgrp

.BR getpgid(0)

ƥץ롼פϥåΥСǤꡢƥץ
Υץ롼פСǤ륻åΥСǤ롣

ץ롼פϥʥ(signal)䡢ü(terminal)ˤä
Ϥ׵Ĵ(arbitrate)˻Ѥ: 
üƱץ롼ID ĥץϥե
Ȥɤ߹ߤԤʤȤǤ¾Υץüɤ߹ߤ
ԤʤȤ硢ʥˤä(block)롣

Υ
.BR csh (1)
Τ褦ʥץˤäơ֡ȥ(job control)
κݤ˥ץ롼פ뤿˻Ѥ롣
.BR termios (4)
˵ҤƤ
.B TIOCGPGRP

.B TIOCSPGRP
üΥץ롼פ/ꤹΤ˻Ѥ롣

⤷åüäƤơCLOCAL ꤵƤ餺
ϥ󥰥åפ硢å󡦥꡼ SIGHUP 롣
å󡦥꡼λˤϤüΥեɤ
ץ롼פ˽°ƤΥץ SIGHUP ʥ뤬롣

ץνλˤäƥץ롼פɻˤʤäǡ
⤷˸ɻˤʤäץ롼פΥСߤȡ
˸ɻˤʤäץ롼פƤΥץ SIGHUP ʥ
³ SIGCONT ʥ뤬롣

.SH ֤
.BR setpgid "  " setpgrp
硢֤顼ξ \-1 ֤
.I errno
Ŭڤꤵ롣

.B getpgid
ץ롼פ֤
顼ξ \-1 ֤
.I errno
Ŭڤꤵ롣

.B getpgrp
Ͼ˸ߤΥץΥץ롼פ֤
.SH 顼
.TP
.B EINVAL
.I pgid
 0 꾮
.TP
.B EPERM
Ƽεİȿ
.TP
.B ESRCH
.I pid
ɤΥץˤפʤ

.SH 
SVr4, POSIX, 4.4BSD.
.B setpgid 
ؿ
.B getpgrp
ؿ POSIX.1 ˽򤷤Ƥ롣
.B setpgrp
ؿ BSD 4.2 ͳ褹롣
.B getpgid 
ؿ SVr4 ˽򤷤Ƥ롣
.SH Ϣ
.BR getuid (2),
.BR setsid (2),
.BR tcsetpgrp (3),
.BR termios (4)