1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
.\" 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@gmail.com>
.\"
.\" 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 2007-06-01 "Linux" "Linux Programmer's Manual"
.SH ̾
pivot_root \- root ե륷ƥѹ
.SH
.BI "int pivot_root(const char *" new_root ", const char *" put_old );
.SH
.BR pivot_root ()
ϸƤӽФΥץ root ե륷ƥ
.I put_old
ǥ쥯ȥ˰ư
.I new_root
ƤӽФΥץο 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
.BR pivot_root ()
ѹ뤫ɤϤ狼ʤ
.BR pivot_root ()
θƤӤץϡŤ root 䥫ȥǥ쥯ȥȤäƤ
ץξǤư뤳ȤݾڤʤФʤʤ
ñ˹ԤˤϡΥץ root
ȥǥ쥯ȥ
.BR pivot_root ()
ƤӽФ
.I new_root
ѹƤȤǤ롣
嵭ϡ
.BR pivot_root ()
ѹ뤫ΤʤȤդߤơ虜ۣ˽Ƥ롣
ܥڡҤƤǤϡ
.BR pivot_root ()
ϸŤ root ǥ쥯ȥѤƤƤΥץåɤ root
ȥǥ쥯ȥ
.I new_root
ѹ롣ϥͥΥåɤŤ root ǥ쥯ȥ
busy ֤ˤʤɬפǤ롣Υåɤ
Ťǥ쥯ȥ root 䥫ȥǥ쥯ȥȤƤȡ
ե륷ƥ˰ڥʤǤ
Ť root busy ˤʤäƤޤǤ롣
.\"nakano: ȾĹ...
ϡͥ륹åɤե륷ƥؤΥ
Ūᥫ˥बǤΤǤФʵǽ
.BR pivot_root ()
뤫⤷ʤ
ϸƤӽФΥץˤĤƤƤϤޤ뤳Ȥա
.BR pivot_root ()
ȥץΥȥǥ쥯ȥ˱ƶ뤫ɤ
ʬʤä
.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
.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
ƤӽФΥץ
.B CAP_SYS_ADMIN
ѥӥƥäƤʤ
.SH С
.BR pivot_root ()
Linux 2.3.41 Ƴ줿
.SH
.BR pivot_root ()
Linux ˸ͭΤΤʤΤǡܿϤʤ
.SH
glibc ϤΥƥॳФåѡؿƤʤ
.BR syscall (2)
ȤäƸƤӽФȡ
.SH Х
.BR pivot_root ()
ϥƥ¾ΥץƤ root
ȥǥ쥯ȥȤѹʤƤ褤ϤǤ롣
.BR pivot_root ()
λȤ⤦äۣˤʤȡ
äȤ֤ˤ櫓Τ狼ʤ֤ˤʤäƤޤ
.SH Ϣ
.BR chdir (2),
.BR chroot (2),
.BR stat (2),
.BR initrd (4),
.BR pivot_root (8)
|
