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.\" Copyright (C) 2000 by Werner Almesberger
.\" May be distributed under GPL
.\"
.\" Written 2000-02-23 by Werner Almesberger
.\" Modified 2004-06-17 Michael Kerrisk <mtk-manpages@gmx.net>
.\"
.\" Japanese Version Copyright (c) 2000 NAKANO Takeo all rights reserved.
.\" Translated Wed Jun 14 2000 by NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\"
.TH PIVOT_ROOT 2 2004-06-17 "Linux 2.6.7" "Linux Programmer's Manual"
.SH ̾
pivot_root \- root ե륷ƥѹ
.SH
.B #include <linux/unistd.h>
.br
.B #include <errno.h>
.sp
.B _syscall2(int,pivot_root,const char *,new_root,const char *,put_old)
/* Using \fBsyscall\fP(2) may be preferable; see \fBintro\fP(2) */
.sp
.BI "int pivot_root(const char *" new_root ", const char *" put_old );
.SH
.BR pivot_root ()
ϥȥץ root ե륷ƥ
.I put_old
ǥ쥯ȥ˰ư
.I new_root
ȥץο root ե륷ƥˤ롣
.\"
.\" .B CAP_SYS_ADMIN
.\" ѥӥƥɬפǤ롣
.BR pivot_root ()
ŵŪˡϡƥεư˥ƥबŪ
root ե륷ƥ (㤨
.BR initrd )
ޥȤ³ root ե륷ƥޥȤ
ԤɬפƤΥץåɤ
root ѹ褦ʾǤ롣
Ť root ǥ쥯ȥȤäƤƤΥץ䥹åɤ
root ȥȥǥ쥯ȥ (cwd)
.BR pivot_root ()
ѹ뤫ɤϤ狼ʤ
.BR pivot_root ()
θƤӤץϡŤ root / cwd ȤäƤץ
ξǤư뤳ȤݾڤʤФʤʤ
ñ˹ԤˤϡΥץ root cwd
.BR pivot_root ()
ƤӽФ
.I new_root
ѹƤȤǤ롣
嵭ϡ
.BR pivot_root ()
ѹ뤫ΤʤȤդߤơ虜ۣ˽Ƥ롣
ܥڡҤƤǤϡ
.BR pivot_root ()
ϸŤ root ǥ쥯ȥѤƤƤΥץåɤ root cwd
.I new_root
ѹ롣ϥͥΥåɤŤ root ǥ쥯ȥ
busy ֤ˤʤɬפǤ롣Υåɤ
Ťǥ쥯ȥ root / cwd ȤƤȡե륷ƥ
ڥʤǤŤ root busy ˤʤäƤޤǤ롣
.\"nakano: ȾĹ...
ϡͥ륹åɤե륷ƥؤΥ
Ūᥫ˥बǤΤǤФʵǽ
.BR pivot_root ()
뤫⤷ʤ
ϥȥץˤĤƤƤϤޤ뤳Ȥա
.BR pivot_root ()
ȥץ cwd ˱ƶ뤫ɤϤ狼ʤ
ä
.BR pivot_root ()
ľ
.B chdir("/")
ƤӽФȤ褤
.IR new_root " " put_old
ˤϰʲ¤:
.IP \- 3
ǥ쥯ȥǤʤФʤʤ
.IP \- 3
.IR new_root " " put_old
ϸߤ root Ʊե륷ƥˤäƤϤʤʤ
.IP \- 3
.IR put_old " " new_root
ʲˤʤФʤʤʤ
.I put_old
ʸ 1 İʾ
.I ../
դ뤳Ȥˤä
.I new_root
Ʊǥ쥯ȥ꤬ʤФʤʤ
.IP \- 3
¾Υե륷ƥब
.I put_old
˥ޥȤƤƤϤʤʤ
.PP
ˤĤƤ
.BR pivot_root (8)
ȤΤȡ
ߤ root ޥȥݥȤǤϤʤ
.RB ( chroot (2)
.BR pivot_root ()
θʤɡʲ⻲) 硢
Ť root ǥ쥯ȥǤϤʤ
Υե륷ƥΥޥȥݥȤ
.I put_old
˥ޥȤ롣
.SH
.I new_root
ϥޥȥݥȤǤʤƤ褤
ξ
.I /proc/mounts
ϡ
.I new_root
root
.RI ( / )
Ȥե륷ƥΥޥȥݥȤɽ롣
.SH ֤
0 ֤顼 \-1 ֤
.I errno
Ŭڤͤꤵ롣
.SH 顼
.BR pivot_root ()
.BR stat (2)
֤륨顼
.RI ( errno
) ֤ǽ롣˰ʲ֤Ȥ:
.TP
.B EBUSY
.IR new_root " ޤ " put_old
ߤ root ե륷ƥˤ뤫
.I put_old
ˤʤ餫Υե륷ƥबޥȤƤ롣
.TP
.B EINVAL
.IR put_old " " new_root
βؤˤʤ
.TP
.B ENOTDIR
.IR new_root " ޤ " put_old
ǥ쥯ȥǤʤ
.TP
.B EPERM
ȥץ
.B CAP_SYS_ADMIN
ѥӥƥäƤʤ
.SH Х
.BR pivot_root ()
ϥƥ¾ΥץƤ root
cwd ȤѹʤƤ褤ϤǤ롣
.BR pivot_root ()
λȤ⤦äۣˤʤȡ
äȤ֤ˤ櫓Τ狼ʤ֤ˤʤäƤޤ
.SH
.BR pivot_root ()
Linux ˸ͭΤΤʤΤǡܿϤʤ
.SH
.BR pivot_root ()
Linux 2.3.41 Ƴ줿
.SH Ϣ
.BR chdir (2),
.BR chroot (2),
.BR stat (2),
.BR initrd (4),
.BR pivot_root (8)
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