.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1992 Drew Eckhardt <drew@cs.colorado.edu>, March 28, 1992
.\" and Copyright (c) Michael Kerrisk, 2001, 2002, 2005
.\" May be distributed under the GNU General Public License.
.\" Modified by Michael Haardt <michael@moria.de>
.\" Modified 24 Jul 1993 by Rik Faith <faith@cs.unc.edu>
.\" Modified 21 Aug 1994 by Michael Chastain <mec@shell.portal.com>:
.\"   New man page (copied from 'fork.2').
.\" Modified 10 June 1995 by Andries Brouwer <aeb@cwi.nl>
.\" Modified 25 April 1998 by Xavier Leroy <Xavier.Leroy@inria.fr>
.\" Modified 26 Jun 2001 by Michael Kerrisk
.\"     Mostly upgraded to 2.4.x
.\"     Added prototype for sys_clone() plus description
.\"	Added CLONE_THREAD with a brief description of thread groups
.\"	Added CLONE_PARENT and revised entire page remove ambiguity
.\"		between "calling process" and "parent process"
.\"	Added CLONE_PTRACE and CLONE_VFORK
.\"	Added EPERM and EINVAL error codes
.\"	Renamed "__clone" to "clone" (which is the prototype in <sched.h>)
.\"	various other minor tidy ups and clarifications.
.\" Modified 26 Jun 2001 by Michael Kerrisk <mtk-manpages@gmx.net>
.\"	Updated notes for 2.4.7+ behaviour of CLONE_THREAD
.\" Modified 15 Oct 2002 by Michael Kerrisk <mtk-manpages@gmx.net>
.\"	Added description for CLONE_NEWNS, which was added in 2.4.19
.\" Slightly rephrased, aeb.
.\" Modified 1 Feb 2003 - added CLONE_SIGHAND restriction, aeb.
.\" Modified 1 Jan 2004 - various updates, aeb
.\" Modified 2004-09-10 - added CLONE_PARENT_SETTID etc - aeb.
.\" 2005-04-12, mtk, noted the PID caching behaviour of NPTL's getpid()
.\"	wrapper under BUGS.
.\" 2005-05-10, mtk, added CLONE_SYSVSEM, CLONE_UNTRACED, CLONE_STOPPED.
.\" 2005-05-17, mtk, Substantially enhanced discussion of CLONE_THREAD.
.\"
.\" Japanese Version Copyright (c) 2001 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated 2001-08-17, HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\" Modified 2002-09-24, Akihiro MOTOKI <amotoki@dd.iij4u.or.jp>
.\" Modified 2005-02-02, Akihiro MOTOKI
.\" Updated 2005-04-17, Akihiro MOTOKI
.\" Updated 2005-09-10, Akihiro MOTOKI
.\" Updated 2006-03-05, Akihiro MOTOKI, catch up to LDP v2.25
.\"
.\"WORD:	capability	ѥӥƥ
.\"WORD:	pending signals	Ԥʥ
.\"
.TH CLONE 2 2005-05-17 "Linux 2.6" "Linux Programmer's Manual"
.SH ̾
clone \- ҥץ
.SH 
.nf
.B #include <sched.h>

.BI "int clone(int (*" "fn" ")(void *), void *" child_stack \
", int " flags ", void *" "arg" );

.BI "_syscall2(int, " clone ", int, " flags ", void *, " child_stack )

.BI "_syscall5(int, " clone ", int, " flags ", void *, " child_stack ,
.BI "     int *, " parent_tidptr ", struct user_desc *, " newtls ,
.BI "     int *, " child_tidptr )
        /* Using \fBsyscall\fP(2) may be preferable; see \fBintro\fP(2) */
.fi
.SH 
.BR clone ()

.BR fork (2)
Ʊ褦ˡǿץ롣
.BR clone ()
ˤϡ饤֥ؿȤβؤˤ
.BR clone ()
ƥॳ뤬¸ߤ롣ʲǤϡƥॳ
.B sys_clone
ɽȤȤ롣
.B sys_clone
˴ؤϤΥޥ˥奢κǸˤ롣

.BR fork (2)
ȤϰۤʤꡢΥǤϡҥץ (child process)
ȸƤӽФΥץȤ֡
եǥץΥơ֥롢ʥ롦ϥɥΥơ֥ʤɤ
¹ԥƥȤΰͭǤ롣
(Υޥ˥奢ˤָƤӽФΥץפϡ̾
ֿƥץפȰפ롣âҤ
.B CLONE_PARENT
ι⻲ȤΤ)

.BR clone ()
μפʻˡϥå (threads) 뤳ȤǤ:
ĤΥץʣΥåɤ϶ͭ줿֤
Ʊ˼¹Ԥ롣

.BR clone ()
ǻҥץ줿ˡ줿ҥץϴؿ
.IR fn ( arg )
¹Ԥ롣
(
.BR fork (2)
Ȥϰۤʤ롣
.BR fork (2)
ξ硢ҥץ
.BR fork (2)
ƤӽФ줿꤫¹Ԥ³롣)
.I fn
ϡҥץ¹ԤϤ˻ҥץƤӽФ
ؿؤΥݥ󥿤Ǥ롣
.I arg
ϤΤޤ
.I fn
ؿؤϤ롣

.IR fn ( arg )
ؿλȡҥץϽλ롣
.I fn
ˤä֤줿ҥץνλɤȤʤ롣
ҥץϡ
.BR exit (2)
ƤŪ˽λ뤳Ȥ⤢뤷̿Ūʥʥ
˽λ뤳Ȥ⤢롣

.I child_stack
ϡҥץˤäƻѤ륹åΰ֤ꤹ롣
ҥץȸƤӽФΥץϥͭ뤳Ȥ뤿ᡢ
ҥץϸƤӽФΥץƱåǼ¹Ԥ뤳ȤǤʤ
ΤᡢƤӽФΥץϻҥץΥåΤΥ֤
Ѱդơζ֤ؤΥݥ󥿤
.BR clone ()
ϤʤФʤʤ
(HP PA ץåʳ) Linux ưƤΥץåǤϡ
åϲ (ɥ쥹) ؤȿӤ롣Τᡢ̤
.I child_stack
ϻҥץΥåΤѰդ֤ΰ礭
ɥ쥹ؤ褦ˤ롣

.I flags
β 1 ХȤϻҥץ˿ƥץؤ
.I "λʥ (termination signal)"
ֹꤹ롣ΥʥȤ
.B SIGCHLD
ʳꤵ줿硢ƥץϡ
.BR wait (2)
ǻҥץԤĺݤˡץȤ
.B __WALL
ޤ
.B __WCLONE
ꤷʤФʤʤ
ɤΥʥꤵʤä硢ҥץλ˿ƥץ
˥ʥʤ

.I flags
ˤϡʲΤ 0İʾӥå (bitwise-or)
ȤäΤǤ롣ϸƤӽФΥץ
ҥץδ֤Dzͭ뤫ꤹ:
.TP
.BR CLONE_PARENT " (Linux 2.3.12 ʹ)"
.B CLONE_PARENT
ꤵ줿硢Ҷ
.RB ( getppid (2)
֤) ƥץϸƤӽФΥץοƥץƱˤʤ롣

.B CLONE_PARENT
ꤵƤʤ硢
.RB ( fork (2)
Ʊͤ) ƤӽФΥץλҶοƤˤʤ롣

Ҷλ˥ʥ뤬Τ
.BR getppid (2)
֤ƥץǤդ뤳ȡΤ
.B CLONE_PARENT
ꤵ줿硢ƤӽФΥץǤϤʤƤӽФΥץ
ƥץ˥ʥ뤬롣
.TP
.B CLONE_FS
.B CLONE_FS
ꤵ줿硢ƤӽФΥץȻҥץƱե롦ƥ
ͭ롣ե롦ƥϡե롦ƥΥ롼 (root)
ȡ󥰡ǥ쥯ȥ (current working directory)
 umask ʤɤǤ롣
ƤӽФΥץҥץΤɤ餫ˤä
.BR chroot (2),
.BR chdir (2),
.BR umask (2)
ƤӽФȡ⤦Υץˤƶڤ֡

.B CLONE_FS
ꤵƤʤ硢ҥץϡ
.BR clone ()
¹Ԥ줿ǤΡƤӽФΥץΥե롦ƥΥԡ
Ѥ롣
ʹߤϡƤӽФΥץȻҥץΰ
.BR chroot (2),
.BR chdir (2),
.BR umask (2)
ƤӽФƤ⡢⤦ΥץˤϱƶͿʤ
.TP
.B CLONE_FILES
.B CLONE_FILES
ꤵ줿硢ƤӽФΥץȻҥץϥեǥץ
ơ֥ͭ롣
ƤӽФץȤλҥץΰ
եǥץϡ⤦ˤƤͭǤ롣
Ʊ褦ˡΥץեǥץĤꡢ
.RB ( fcntl (2)
.B F_SETFD
Ȥä) ǥץ˴Ϣե饰ѹꤹȡ
⤦Υץˤƶ롣

.B CLONE_FILES
ꤵƤʤ硢ҥץϡ
.BR clone ()
¹Ԥ줿ǡƤӽФΥץץ󤷤ƤƤ
եǥץΥԡѾ
(ҥץʣ줿եǥץϡ
бƤӽФΥץΥեǥץ
Ʊե뵭
.RB ( open (2)
) 򻲾Ȥ)
ʹߤˡƤӽФΥץȻҥץΰ
եǥץ (եǥץ
ץ󡦥䡢եǥץե饰ѹ)
ԤäƤ⡢⤦ΥץˤϱƶͿʤ
.TP
.BR CLONE_NEWNS " (Linux 2.4.19 ʹ)"
ҥץ򿷤̾ (namespace) dzϤ롣

ơΥץϰĤ̾¸ߤ롣ץ
.I "̾ (namespace)"
ϡΥץ鸫ե볬ؤɽǡ (mount ν) Ǥ롣
.B CLONE_NEWNS
ե饰åȤ줺
.BR fork (2)

.BR clone (2)
ƤФȡҥץϿƥץƱ֤̾˺롣
ƥॳ
.BR mount (2)
.BR umount (2)
ƤФȸƤӽФΥץ֤̾ѹ졢η
ƤӽФΥץƱ֤̾ˤץϤ٤Ʊƶ뤬
ۤʤ֤̾ˤץϱƶʤ

.B CLONE_NEWNS
ե饰åȤ
.BR clone (2)
ƤФȡclone Ǻ줿ҥץϿ֤̾dzϤ롣
֤̾Ͽƥץ֤̾Υԡǽ롣

øץ (CAP_SYS_ADMIN ѥӥƥĥץ) Τߤ
.B CLONE_NEWNS
ե饰ꤹ뤳ȤǤ롣
Ĥ
.BR clone ()
ƤӽФǡ
.B CLONE_NEWNS

.B CLONE_FS
ξꤹ뤳ȤϤǤʤ
.TP
.B CLONE_SIGHAND
.B CLONE_SIGHAND
ꤵ줿硢ƤӽФΥץȻҥץƱʥ롦ϥ
ɥΥơ֥ͭ롣ƤӽФΥץޤϻҥץΤɤ餫
.BR sigaction (2)
ƤӽФƥʥбưѹ硢
⤦ΥץΥʥưѹ롣
âƤӽФΥץȻҥץϡ
ץˡʥ롦ޥ (signal mask) ȽԤʥν
äƤ롣Τᡢץϡ
.BR sigprocmask (2)
Ѥơ⤦Υץ˱ƶͿ
ʥػ (block)  (unblock) Ǥ롣

.B CLONE_SIGHAND
ꤵƤʤ硢ҥץ
.BR clone ()
¹Ԥ줿ǤΡƤӽФΥץΥʥ롦ϥɥ
ԡѾ롣ʹߤϡΥץ
.BR sigaction (2)
ƤӽФƤ⡢⤦ΥץˤϱƶͿʤ

Linux 2.6.0-test6 ʹߤǤϡ
.B CLONE_SIGHAND
ꤹ硢
.B CLONE_VM

.I flags
˴ޤʤФʤʤ
.TP
.B CLONE_PTRACE
.B CLONE_PTRACE
ꤵ졢ĸƤӽФΥץ (trace) Ƥ硢ҥץ
Ʊͤפ롣
.RB ( ptrace (2)
򻲾ȤΤ)
.TP
.BR CLONE_UNTRACED " (Linux 2.5.46 ʹ)"
.B CLONE_UNTRACED
ꤵȡ trace ԤäƤץ
λҥץ
.B CLONE_PTRACE
ŬѤ뤳ȤǤʤ
.TP
.BR CLONE_STOPPED " (Linux 2.6.0-test2 ʹ)"
.B CLONE_STOPPED
ꤵȡҥץϺǽ
.RB ( SIGSTOP
ʥ줿Τ褦) ߤ֤Ȥʤ롣
ҥץƳˤ
.B SIGCONT
ʥʤФʤʤ
.TP
.B CLONE_VFORK
.B CLONE_VFORK
ꤵ줿硢
.RB ( vfork (2)
Ʊͤ) ҥץ
.BR execve (2)
ޤ
.BR _exit (2)
ˤäƲۥޤǡƤӽФΥץμ¹Ԥߤ롣

.B CLONE_VFORK
ꤵƤʤ硢
.BR clone ()
ƤӽФϡƤӽФΥץȻҥץ
ξ塼оݤȤʤꡢץꥱϤΥץ
¹Խ˰¸ʤ褦ˤ٤Ǥ롣
.TP
.B CLONE_VM
.B CLONE_VM
ꤵ줿硢ƤӽФΥץȻҥץƱ֤
¹Ԥ롣äˡƤӽФΥץҥץΰ
񤭹ƤϤ⤦Υץ⸫뤳ȤǤ롣ˡ
ҥץƤӽФΥץΰ
.BR mmap (2)

.BR munmap (2)
Ȥäƥޥåפꥢޥåפ硢
⤦Υץˤƶڤ֡

.B CLONE_VM
ꤵƤʤ硢ҥץ
.BR clone ()
¹Ԥ줿ǤΡƥץΥ֤򥳥ԡ
̤Υ֤Ǽ¹Ԥ롣
ΥץԤäؤν񤭹ߤ
եΥޥå/ޥåפϡ
.BR fork (2)
ξƱ͡⤦Υץˤϱƶʤ
.TP
.BR CLONE_PID (ѻ)
.B CLONE_PID
ꤵ줿硢ҥץϸƤӽФΥץƱץ ID
Ǻ롣ϥƥϥå󥰤Τˤ
ʳˤϤޤȤʤ Linux 2.3.21 ʹߤǤϡ
ƥΥ֡ȥץ (PID 0) Υե饰Ǥ롣
Linux 2.5.16 Ǻ줿
.TP
.BR CLONE_THREAD " (Linux 2.4.0-test8ʹ)"
.B CLONE_THREAD
ꤵ줿硢ҥץϸƤӽФΥץƱåɡ롼פ
֤롣
.B CLONE_THREAD
ˤĤƤΰʹߤεɤߤ䤹뤿ᡢ
֥åɡפȤѸϥåɡ롼פΥץ
ȤΤ˻ȤȤȤ롣
.\" CLONE_DETACHED Ȥե饰2.5.32 ƳƤ餷Ф餯δ¸ߤ
.\" Υե饰ϡƥץҥץλΥʥɬפȤʤȤ
.\" ɽΤǤ롣2.6.2 ǡ CLONE_DETATCHED  CLONE_THREAD Ȱ
.\" ꤹɬפϤʤʤä

åɡ롼פϡ åɽǰĤ PID ͭȤ POSIX
åɤγǰ򥵥ݡȤ뤿 Linux 2.4 ˲ä줿ǽǤä
Ūˤϡζͭ PID Ϥ뤽Υåɥ롼פ
åɡ롼׼̻ (TGID) Ǥ롣
Linux 2.4 ʹߤǤϡ
.BR getpid (2)
θƤӽФǤϤΥץΥåɡ롼 ID ֤

륰롼פ°륹åɤ (ƥΤ) դʥå ID (TID)
Ƕ̤Ǥ롣åɤ TID 
.BR clone ()
θƤӽФشؿη̤Ȥ֤졢
åɤϼʬȤ TID 
.BR gettid (2)
ǼǤ롣

.B CLONE_THREAD
ꤻ
.BR clone ()
θƤӽФԤȡ
줿åɤϤΥåɤ TID Ʊͤ TGID 
åɡ롼פ֤롣Υåɤ
åɡ롼פΡ֥꡼פǤ롣

.B CLONE_THREAD
ꤷƺ줿åɤϡ
.RB ( CLONE_PARENT
ξƱͤ)
.BR clone ()
ƤӽФƱƥץġ
Τᡢ
.BR getppid (2)
Ƥ֤ȡĤΥåɡ롼פ°åɤƱ֤ͤ
.B CLONE_THREAD
Ǻ줿åɤλݤˡ
Υåɤ
.BR clone (2)
Ȥäåɤˤ
.B SIGCHLD
(⤷¾νλʥ) ʤ
ޤ
.BR wait (2)
Ȥäƽλåɤξ֤뤳ȤǤʤ
(Τ褦ʥåɤ
.I detached
(ʬΥ줿) Ȥ)

åɡ롼פ°ƤΥåɤλ塢
Υåɡ롼פοƥץ
.B SIGCHLD
(⤷¾νλʥ) 롣

åɡ롼פ°줫Υåɤ
.BR execve (2)
¹Ԥȡåɡ롼ס꡼ʳƤΥåɤ
λ졢ץΥåɡ롼ס꡼β
¹Ԥ롣

åɡ롼פ°åɤΰĤ
.BR fork (2)
Ȥäƻҥץ硢
åɡ롼פΤɤΥåɤǤäƤ
λҶ
.BR wait (2)
Ǥ롣

Linux 2.5.35 ʹߤǤϡ
.B CLONE_THREAD
ꤹ硢
.I flags

.B CLONE_SIGHAND
ޤޤƤʤФʤʤ

.BR kill (2)
Ȥäƥåɡ롼 (Ĥޤ TGID) ˥ʥ뤳ȤǤС
.BR tgkill (2)
ȤäΥå (Ĥޤ TID) ˥ʥ뤳ȤǤ롣

ʥȽϥץΤ˱ƶ:
ϥɥꤷƤʤʥ뤬륹åɤȡ
Υʥϥåɡ롼פС˱ƶڤܤ
(λꡢߤꡢư³ꡢ̵뤵줿ꤹ)

ơΥåɤȼΥʥޥäƤꡢ
.BR sigprocmask (2)
Ǥ롣
ԤΥʥˤϡ
.BR kill (2)
ץΤФ (Ĥޤꡢåɡ롼פ
ɤΥСˤǤ) ȡ
.BR tgkill (2)
ġΥåɤФΤꤨ롣
.BR sigpending (2)
ƤӽФȡץΤФԤʥȸƤӽФ
åɤФԤʥ礷ʥ뽸礬֤롣

.BR kill (2)
Ȥäƥåɡ롼פ˥ʥ뤬줿ǡ
Υåɡ롼פΥʥФ륷ʥ롦ϥɥ餬
ϿƤȤˤϡʥ롦ϥɥϥåɡ롼פ
СΤĤΥåɤǤư롣ϥɥ餬
ư륹åɤϡΥʥػ (block) Ƥʤ
С椫Ĥ (arbitrarily) Ф롣
åɡ롼פ°ʣΥåɤ
.BR sigwaitinfo (2)
ȤäƱʥԤäƤ硢
Υåɤ椫Ĥ򥫡ͥ뤬򤷡
Υåɤ
.B kill (2)
Ȥä줿ʥ롣
.TP
.BR CLONE_SYSVSEM " (Linux 2.5.10 ʹ)"
.B CLONE_SYSVSEM
åȤȡҥץȸƤӽФץϰĤ
System V ޥեΥɥͥꥹ
.RB ( semop (2)
) ͭ롣Υե饰åȤƤʤС
ҥץȼΥɥꥹȤ (ꥹȤνͤ϶Ǥ)
.TP
.BR CLONE_SETTLS " (Linux 2.5.32 ʹ)"
.I newtls
ϡ TLS (Thread Local Storage) ǥץǤ롣
.RB ( set_thread_area (2)
򻲾ȤΤ)
.TP
.BR CLONE_PARENT_SETTID " (Linux 2.5.49 ʹ)"
ƥץȻҥץΥ
.I parent_tidptr
ؤΰ˻ҥץΥå ID Ǽ롣
(Linux 2.5.32-2.5.48 Ǥϡ
ƱȤ򤹤 CLONE_SETTID Ȥե饰¸ߤ)
.TP
.BR CLONE_CHILD_SETTID " (Linux 2.5.49 ʹ)"
ҥץΥ
.I child_tidptr
ؤ˻ҥץΥå ID Ǽ롣
.TP
.BR CLONE_CHILD_CLEARTID " (Linux 2.5.49 ʹ)"
ҥץλȤ˻ҥץΥ
.I child_tidptr
ؤˤҥץΥå ID õ
Υɥ쥹 futex  wake () 롣
Υɥ쥹
.BR set_tid_address (2)
ƥॳѹ뤳ȤǤ롣
εǽϥåɥ饤֥ǻѤ롣

.SS "sys_clone"
.B sys_clone
ƥॳϡ
.BR fork (2)
˶ᤤˤʤäƤꡢҥץμ¹ԤƤӽФԤ줿꤫
³롣
Τᡢ
.B sys_clone
ɬפȤ
.I flags

.I child_stack
Ǥꡢ
.BR clone ()
Ʊ̣
(ΰν֤
.BR clone ()
Ȥϰۤʤ뤳Ȥդ)

.B sys_clone
Τ⤦Ĥΰ㤤ϡ
.I child_stack
ǤɤȤǤ롣ξˤϡɤ餫Υץ
åѹˡ񤭹߻ԡ (copy-on-write) ˤ
ҥץåڡΩԡ뤳Ȥݾڤ롣
ξ硢ư뤿ˤϡ
.B CLONE_VM
ץꤷƤϤʤʤ

Linux 2.5.49 ʹߤǤϡ
.B sys_clone
ƥॳ 5ĤΰȤ롣
ɲä줿 2Ĥΰϡ
.I parent_tidptr

.I child_tidptr
Ǥ롣
.I parent_tidptr
ϡCLONE_PARENT_SETTID ꤵ줿ˡҥץΥåID
񤭹ޤ (ƥץȻҥץΥ) ؤ
.I child_tidptr
ϡCLONE_CHILD_SETTID ꤵ줿ˡҥץΥåID
񤭹ޤ (ҥץΥ) ؤ
.SH ֤
.\" gettid()  current->pid ֤
.\" getpid()  current->tgid ֤
硢ƤӽФμ¹ԥåɤˤϻҥץΥåID ֤롣
Ԥ硢 ƤӽФΥƥȤˤ \-1 ֤졢ҥץ
줺
.I errno
Ŭڤꤵ롣
.SH 顼
.TP
.B EAGAIN
Ǥ˼¹Υץ¿롣
.TP
.B EINVAL
.B CLONE_SIGHAND
ꤵƤ
.B CLONE_VM
ꤵƤʤä
(Linux 2.6.0-test6 ʹ)
.TP
.B EINVAL
.B CLONE_THREAD
ꤵƤ
.B CLONE_SIGHAND
ꤵƤʤä
(Linux 2.5.35 ʹ)
.\" .TP
.\" .B EINVAL
.\" .B CLONE_DETACHED
.\" 
.\" .B CLONE_THREAD
.\" Τ줫ꤵ줿
.\" (Linux 2.6.0-test6 ʹ)
.TP
.B EINVAL
.B CLONE_FS

.B CLONE_NEWNS
ξ
.I flags
˻ꤵ줿
.TP
.B EINVAL
.I child_stack
˥ꤷ
.BR clone ()
֤
.TP
.B ENOMEM
ҥץΤ˳ݤ٤¤Τ䡢ƤӽФΥƥȤ
򥳥ԡΤɬפʥʬ˳Ƥ뤳ȤǤʤ
.TP
.B EPERM
root ʳΥץ (CAP_SYS_ADMIN ʤץ) ˤ
.B CLONE_NEWNS
ꤵ줿
.TP
.B EPERM
PID  0 ʳΥץˤä
.B CLONE_PID
ꤵ줿
.SH 
libc5 ˤ
.BR clone ()
Ϥʤglibc2 Ǥ
.BR clone ()
󶡤ƤꡢΥޥ˥奢ڡ˵ܤ̤Ǥ롣
.SH 
ͥ 2.4.x ǤϡŪˤ
.B CLONE_THREAD
ե饰ꤷƤ⿷åɤοƤ
ƤӽФץοƤƱˤϤʤ
С 2.4.72.4.18 ΥͥǤϡ
(ͥ 2.6 Ʊ褦) CLONE_THREAD ե饰ꤹȡ
ۤΤ CLONE_PARENT ե饰ꤷȤˤʤ롣

x86 Ǥϡ
.BR clone ()
 vsyscall ͳǤϤʤľ
.I "int $0x80"
ͳǸƤӽФ٤Ǥ롣
.SH 
.BR clone ()

.B sys_clone
 Linux ͭǤꡢܿθץǤϻѤ٤
ǤϤʤ
.SH Х
NPTL åɡ饤֥ޤǤ GNU C 饤֥ΤĤΥС
ˤϡ
.BR getpid ()
ΥåѡؿޤޤƤꡢΥåѡؿ PID 򥭥å夹롣
Τ褦ʥ饤֥󥯤ץǤϡ
.BR getpid ()
ƤӽФƱ֤ͤ뤳Ȥ롣
ȤΥåɤ
.B CLONE_THREAD
Ѥƺ줿ΤǤʤƤ (äơƱåɡ롼פ
°ƤʤƤ) Ǥ롣
ͤˤϡʲΤ褦ʥɤȤɬפ
.nf

    #include <syscall.h>

    pid_t mypid;

    mypid = syscall(SYS_getpid);
.fi
.SH Ϣ
.BR fork (2),
.BR futex (2),
.BR getpid (2),
.BR gettid (2),
.BR set_thread_area (2),
.BR set_tid_address (2),
.BR tkill (2),
.BR unshare (2),
.BR wait (2),
.BR capabilities (7),
.BR pthreads (7)