.\" Hey Emacs! This file is -*- nroff -*- source.
.\"
.\" Copyright (c) 1992 Drew Eckhardt <drew@cs.colorado.edu>, March 28, 1992
.\" May be distributed under the GNU General Public License.
.\" Modified by Michael Haardt <michael@moria.de>
.\" Modified Sat Jul 24 13:22:07 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>
.\"
.\" Japanese Version Copyright (c) 1998 HANATAKA Shinya
.\"         all rights reserved.
.\" Translated Mon Jun 22 02:05:10 JST 1998
.\"         by HANATAKA Shinya <hanataka@abyss.rim.or.jp>
.\"
.TH CLONE 2 "25 april 1998" "Linux 2.0.33" "Linux Programmer's Manual"
.SH ̾
__clone \- ҥץ
.SH 
.B #include <sched.h>
.sp
.BI "int __clone(int (*" "fn" ") (void *" "arg" "), void *" "child_stack" ", int " "flags" ", void *" "arg" ")"

.SH 
.B __clone

.BR fork (2)
Τ褦˿ץ롣
.BR fork (2)
Ȱä
.B __clone
ϻҥץ(child process)֡ե롦ǥץ
ơ֥롢ʥ롦ϥɥ顼Υơ֥ʤɤμ¹ԥƥȤΰ
ƥץȶͭ뤳Ȥǽˤ롣
.B __clone
μפʻˡϥå(threads)뤳ȤǤ:
ĤΥץʣΥåɤ϶ͭ줿֤
ƶĴƼ¹Ԥ롣

ҥץ줿ˡؿ
.IR fn ( arg )
¹Ԥ롣
.I fn
ϻҥץ¹ԤϤ˸ƤӽФ
ؿؤΥݥ󥿡Ǥ롣
.I arg
ϤΤޤ
.I fn
ؿؤϤ롣

.IR fn ( arg )
ؿŬѤ֤ˡҥץϽλ롣
.I fn
ˤä֤줿ϻҥץνλɤȤʤ롣
ҥץŪ
.BR exit (1)
Ƥꡢ̿Ūʥʥˤ⽪λ롣

.I child_stack
ϻҥץˤäƻѤ륹åΰ֤ꤹ롣
ҥץȿƥץϥͭ뤿ᡢ̤˻ҥץ
ƥץƱåǼ¹Ԥ뤳ȤǤʤ
ΤƥץϻҥץΥåΤΥ֤
ơζ֤ؤΥݥ󥿡
.BR __clone 
ϤʤФʤʤ
Linux äƤ(HP PA ץå)ƤΥץåǤ
åϲؤĹ롣
.I child_stack
񡢻ҥץΥåΤꤷ֤ΰ礭
ɥ쥹ؤΥݥ󥿡Ǥ롣

.I flags
β̥ХȤϻҥץ˿ƥץؤ
ʥֹꤹ롣
.I flags
Ϥ˰ʲƤΤĤΥӥå OR(bitwise-or)ǡ
ƥץȻҥץδ֤Dzͭ뤫ꤹ뤿˻Ѥ롣

.TP
.B CLONE_VM
.B CLONE_VM
ꤵ줿硢ƥץȻҥץƱ֤Ǽ¹Ԥ롣
ä˿ƥץҥץˤäƥ˽񤭹ޤ줿Ƥ¾Υץ
ˤäƤ⸫뤳ȤǤ롣ˡ
ҥץƥץ
.BR mmap (2)

.BR munmap (2)
Ȥäƥޥåפꥢޥåפ硢
¾Υץؤƶ롣

.B CLONE_VM
ꤵƤʤ硢ҥץ
.BR __clone 
¹Ԥ줿ǤοƥץΥ֤򥳥ԡ
̤Υ֤Ǽ¹Ԥ롣
ץǹԤʤ줿ؤν񤭹ߡ
եΥޥå/ޥåפ
.BR fork (2)
ξƱ͡¾ˤϱƶʤ
.TP
.B CLONE_FS
.B CLONE_FS
ꤵ줿硢ƥץȻҥץƱե롦ƥ
ͭ롣ˤϥե륷ƥΥ롼(root)丽ߤ
󥰡ǥ쥯ȥ(current working directory) umask ޤޤ롣
ƥץҥץˤäƹԤʤ줿Ƥ
.BR chroot (2),
.BR chdir (2),
.BR umask (2)
¾Υץˤƶ롣

.B CLONE_FS
ꤵƤʤ硢ҥץ
.BR __clone 
¹Ԥ줿ǤοƥץΥե롦ƥΥԡ
Ѥ롣
ʸ塢ץˤäƹԤʤ줿
.BR chroot (2), chdir (2), umask (2)
¾ˤϱƶʤ

.TP
.B CLONE_FILES
.B CLONE_FILES
ꤵ줿硢ƥץȻҥץϥե롦ǥץ
ơ֥ͭ롣ե롦ǥץϻҥץȿƥץ
ˤƾƱե򻲾Ȥ롣ƥץҥץˤä
줿ƤΥե롦ǥץ¾ΥץˤƤ
ͭǤ롣Ʊͤˡץե롦ǥץ
(close)䡢ꤵ줿ե饰ѹԤʤä¾Υץ
ƶ롣

.B CLONE_FILES
ꤵƤʤ硢ҥץ
.BR __clone 
¹Ԥ줿Ǥοƥץץ(open)ƤƤ
ե롦ǥץΥԡѾ롣
ʸ塢ץˤäƹԤʤ줿ե롦ǥץ
ФƹԤʤ줿¾ˤϱƶʤ

.TP
.B CLONE_SIGHAND
.B CLONE_SIGHAND
ꤵ줿硢ƥץȻҥץƱʥ롦ϥɥ顼
ơ֥ͭ롣ƥץޤϻҥץ
.BR sigaction (2)
뤷ơʥ˴ϢŤ줿ưѹ硢Ʊͤ
¾Υץưѹ롣ǡƥץȻҥץ
̤Υʥ롦ޥ(signal mask)ȲΥʥνäƤ롣
ǡץ¾Υץ˱ƶͿ뤳Ȥʤ
.BR sigprocmask (2)
Ѥƥʥػ(block)(unblock)Ǥ롣

.B CLONE_SIGHAND
ꤵƤʤ硢ҥץ
.B __clone
뤵줿ǤοƥץΥʥ롦ϥɥ顼ΥԡѾ롣
ʸ塢ץˤäƹԤʤ줿
.BR sigaction (2)
¾Υץˤϱƶʤ

.TP
.B CLONE_PID
.B CLONE_PID
ꤵ줿硢ҥץϿƥץƱץ ID Ǻ롣

.B CLONE_PID
ꤵƤʤ硢ҥץΩץ ID 
ƥץȤ϶̤롣

.SH ֤
硢Ƥμ¹ԥåɤˤϻҥץ PID ֤롣
Ԥ硢 ƤΥƥȤˤ \-1 ֤ҥץϺʤ

.I errno
Ŭڤꤵ롣

.SH 顼
.TP
.B EAGAIN
ǤäƤץ¿᤮롣
.TP
.B ENOMEM
.B __clone
ҥץΤ˳ݤ٤¤Τ䡢ƤΥƥȤ
򥳥ԡΤɬפʥƤ뤳ȤǤʤ

.SH Х

ͥΥС 2.1.97 Ǥϡ
.B CLONE_PID
ե饰ѤƤϤʤʤͥ¾ʬ¿
ƥࡦեȥץ ID ˤϽʣʤȤ
ꤷƤ뤿ˤǤ롣

libc version 5 ˤ
.B __clone
ΤΥȥ꤬¸ߤʤlibc 6 (ޤ̾ glibc2)ˤ
Υޥ˥奢롦ڡ˵ҤƤ
.B __clone
󶡤롣

.SH 

.B __clone
 Linux ͭǤꡢܿɬפʥץǤϻѤƤ
ʤʤåɤѤץꥱΥץߥˤ
LinuxThreads 饤֥Τ褦ʡPOSIX 1003.1c thread API 
饤֥Ѥɤ
.BR pthread_create (3thr)
򻲾Ȥ뤳ȡ

ޥ˥奢롦ڡϥͥ 2.0.x  2.1.x  glibc 2.0.x 
бƤ롣

.SH Ϣ
.BR fork (2),
.BR pthread_create (3thr)