.\" Copyright (c) 1983, 1991 Regents of the University of California.
.\" and Copyright (C) 2007, Michael Kerrisk <mtk.manpages@gmail.com>
.\" All rights reserved.
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.\" 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.
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.\" 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
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.\" 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
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.\"
.\"     @(#)getpgrp.2	6.4 (Berkeley) 3/10/91
.\"
.\" Modified 1993-07-24 by Rik Faith <faith@cs.unc.edu>
.\" Modified 1995-04-15 by Michael Chastain <mec@shell.portal.com>:
.\"   Added 'getpgid'.
.\" Modified 1996-07-21 by Andries Brouwer <aeb@cwi.nl>
.\" Modified 1996-11-06 by Eric S. Raymond <esr@thyrsus.com>
.\" Modified 1999-09-02 by Michael Haardt <michael@moria.de>
.\" Modified 2002-01-18 by Michael Kerrisk <mtk.manpages@gmail.com>
.\" Modified 2003-01-20 by Andries Brouwer <aeb@cwi.nl>
.\" 2007-07-25, mtk, fairly substantial rewrites and rearrangements
.\" of text.
.\"
.\" 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>
.\" Updated Fri Feb  7 JST 2003 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated Sun Feb 23 JST 2003 by Kentaro Shirakata <argrath@ub32.org>
.\" Updated 2007-09-25, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>, LDP v2.64
.\"
.\"WORD:	process group		ץ롼
.\"WORD:	process group ID	ץ롼ID
.\"WORD:	terminal		ü
.\"WORD:	foreground		ե
.\"WORD:	block			(block)
.\"WORD:	job control		֡ȥ
.\"
.TH SETPGID 2 2007-07-26 "Linux" "Linux Programmer's Manual"
.SH ̾
setpgid, getpgid, setpgrp, getpgrp \- ץ롼פ/Ԥ
.SH 
.B #include <unistd.h>
.sp
.BI "int setpgid(pid_t " pid ", pid_t " pgid );
.br
.BI "pid_t getpgid(pid_t " pid );
.sp
.BR "pid_t getpgrp(void);" "                /* POSIX.1 version */"
.br
.BI "pid_t getpgrp(psid_t " pid ");\ \ \ \ \ \ \ \ \ "
/* BSD version */
.sp
.BR "int setpgrp(void);" "                  /* System V version */"
.br
.BI "int setpgrp(pid_t " pid ", pid_t " pgid );
/* BSD version */
.sp
.in -4n
glibc εǽޥ׷
.RB ( feature_test_macros (7)
):
.in
.sp
.ad l
.BR getpgid ():
_XOPEN_SOURCE\ >=\ 500
.br
.BR setpgrp ()
(POSIX.1): _SVID_SOURCE || _XOPEN_SOURCE >= 500
.sp
.BR setpgrp "()\ (BSD),"
.BR getpgrp "()\ (BSD):"
_BSD_SOURCE && !\ (_POSIX_SOURCE || _POSIX_C_SOURCE ||
_XOPEN_SOURCE || _XOPEN_SOURCE_EXTENDED || _GNU_SOURCE || _SVID_SOURCE)
.ad b
.SH 
Υ󥿥ե٤Ƥ Linux Ѳǽǡ
ȤäƥץΥץ롼 ID (PGID) 
꤬Ǥ롣
侩ΡPOSIX.1 ǵꤵ줿ˡǤϡ
.BR getpgrp (void)
ǸƤӽФץ PGID 
.BR setpgid ()
ꤹ롣

.BR setpgid ()

.I pid
ǻꤷץ PGID 
.I pgid
ꤹ롣
.I pid
ʤСƤӽФץΥץ ID  pid ȤƻѤ롣
.I pgid
ʤС
.I pid
ǻꤵ줿ץΥץID  PGID ȤƻѤ롣
.BR setpgid ()
ץ򤢤ץ롼פ̤Υ롼פ
ư뤿˻Ѥ (Υϥѥץ饤
ˤԤ)ξΥץ롼פƱå
ǤʤФʤʤ
.RB ( setsid (2)

.BR credentials (7)
)ξ \fIpgid\fP ϻä٤¸
ץ롼פꤷΥå ID ϻäץ
å ID ˰פʤФʤʤ

POSIX.1 С
.BR getpgrp ()
ϰĤȤ餺
ƤӽФץ PGID ֤

.BR getpgid ()

.I pid
ǻꤵ줿ץ PGID ֤
.I pid
ʤСƤӽФץΥץ ID  pid ȤƻѤ롣
(ƤӽФץʳΥץ PGID μɬפˤʤ뤳Ȥ
äˤʤƤӽФץ PGID ˤ
POSIX.1 С
.BR getpgrp ()
ȤΤ˾ޤ)

System V С
.BR setpgrp ()
ϰĤȤ餺
.I "setpgid(0,\ 0)"
Ǥ롣

BSD ͤ
.BR setpgrp ()

.I pid

.I pgid
ˤȤꡢ
.I "setpgid(pid, pgid)"
Ǥ롣
.\" The true BSD setpgrp() system call differs in allowing the PGID
.\" to be set to arbitrary values, rather than being restricted to
.\" PGIDs in the same session.

BSD ͤ
.BR getpgrp ()

.I pid
ˤȤꡢ
.I "getpgid(pid)"
Ǥ롣
.SH ֤
.BR setpgid ()

.BR setpgrp ()
硢֤顼ξ \-1 ֤
.I errno
Ŭڤꤵ롣

POSIX.1 С
.BR getpgrp ()
Ͼ˸ƤӽФץ PGID ֤

.BR getpgid ()
 BSD ͤ
.BR getpgrp ()
ץ롼פ֤
顼ξ \-1 ֤
.I errno
Ŭڤꤵ롣
.SH 顼
.TP
.B EACCES
ƤӽФץλҥץΥץ롼 ID ѹ褦Ȥ
Ǥˤλҥץ
.BR execve (2)
¹ԤƤ
.RB ( setpgid (),
.BR setpgrp ())
.TP
.B EINVAL
.I pgid
 0 꾮
.RB ( setpgid (),
.BR setpgrp ())
.TP
.B EPERM
ץۤʤ륻åΥץ롼פ˰ư褦Ȥ
ޤϸƤӽФץλҥץΥץ롼 ID ѹ褦
λҥץ̤Υåä
ޤϥå꡼Υץ롼 ID ѹ褦Ȥ
.RB ( setpgid (),
.BR setpgrp ())
.TP
.B ESRCH
.BR getpgid ()
ξ:
.I pid
ɤΥץˤפʤ
.BR setpgid ()
ξ:
.I pid
ƤӽФΥץǤϤʤƤӽФΥץλҥץǤʤ
.SH 
.BR setpgid ()
ȡʤС
.BR getpgrp ()
 POSIX.1-2001 ˽򤷤Ƥ롣

POSIX.1-2001 ϡ
.BR getpgid ()
ȡʤС
.BR setpgrp ()
⵬ꤷƤ롣

 1 ĥС
.BR getpgrp ()
Ȱ 2 ĥС
.BR setpgrp ()
 4.2BSD ͳ褷
POSIX.1 ǤϵꤵƤʤ
.SH 
.BR fork (2)
Ǻ줿ҥץϡƥץ PGID
Ѿ롣
.BR execve (2)
 PGID ¸롣

ƥץ롼פϥåΥСǤꡢƥץ
Υץ롼פ°Ƥ륻åΥСǤ롣

åü (controlling terminal) ĤȤǤ롣
ĤǤ⡢å˽°ץ롼פΰ () 
üΥեɤΥץ롼פˤʤ뤳ȤǤ
ĤΥץ롼פϥХå饦ɤˤʤ롣
ü饷ʥ뤬줿 (㤨Сǥá
.B SIGINT
ʤ)Υʥϥե饦ɤΥץ롼

(ʥʸ
.BR termios (3)
򻲾)
ե饦ɤΥץ롼פü
.BR read (2)
Ǥ롣
Хå饦ɤΥץ롼פü
.BR read (2)
ԤȤ硢Υץ롼פˤϥʥ
.B SIGTSTP
졢Υץ롼פϰ (suspend) 롣
ؿ
.BR tcgetpgrp (3)

.BR tcsetpgrp (3)
ȤȡüΥե饦ɤΥץ롼פ
/Ǥ롣

.BR setpgid ()

.BR getpgrp ()
ϡ
.BR bash (1)
Τ褦ʥץǡΥ (job control) μΤ
ץ롼פΤ˻Ȥ롣

åüäƤơüФ
.B CLOCAL
ե饰ꤵƤ餺üΥϥ󥰥åפ硢
å󡦥꡼
.B SIGHUP
롣
å󡦥꡼λˤϡü
եɤΥץ롼פ˽°ƥץˤ
.B SIGHUP
ʥ뤬롣

ץνλˤäƥץ롼פɻ (orphaned) ˤʤäݤˡ
ο˸ɻˤʤäץ롼פߤƤСС
θɻˤʤäץ롼פƤΥץ
.B SIGHUP
ʥ³
.B SIGCONT
ʥ뤬롣
.SH Ϣ
.BR getuid (2),
.BR setsid (2),
.BR tcgetpgrp (3),
.BR tcsetpgrp (3),
.BR termios (3),
.BR credentials (7)