Mercurial > hg > toybox
annotate toys/other/pivot_root.c @ 1776:7bf68329eb3b draft default tip
Repository switched to git at https://github.com/landley/toybox
| author | Rob Landley <rob@landley.net> |
|---|---|
| date | Thu, 09 Apr 2015 02:28:32 -0500 |
| parents | 57f2a26fa92c |
| children |
| rev | line source |
|---|---|
| 929 | 1 /* pivot_root.c - edit system mount tree |
| 2 * | |
| 3 * Copyright 2012 Rob Landley <rob@landley.net> | |
| 4 | |
|
1775
57f2a26fa92c
To ensure that toybox can be installed alongside busybox without
Paul Barker <paul@paulbarker.me.uk>
parents:
1569
diff
changeset
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5 USE_PIVOT_ROOT(NEWTOY(pivot_root, "<2>2", TOYFLAG_SBIN)) |
| 929 | 6 |
| 7 config PIVOT_ROOT | |
| 8 bool "pivot_root" | |
| 9 default y | |
| 10 help | |
| 11 usage: pivot_root OLD NEW | |
| 12 | |
| 13 Swap OLD and NEW filesystems (as if by simultaneous mount --move), and | |
| 14 move all processes with chdir or chroot under OLD into NEW (including | |
| 15 kernel threads) so OLD may be unmounted. | |
| 16 | |
| 17 The directory NEW must exist under OLD. This doesn't work on initramfs, | |
| 18 which can't be moved (about the same way PID 1 can't be killed; see | |
| 19 switch_root instead). | |
| 20 */ | |
| 21 | |
| 22 #define FOR_pivot_root | |
| 23 #include "toys.h" | |
| 24 | |
|
1569
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A patch against your current ToT that builds in AOSP master.
Elliott Hughes <enh@google.com>
parents:
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25 #include <sys/syscall.h> |
|
da72fa267b7b
A patch against your current ToT that builds in AOSP master.
Elliott Hughes <enh@google.com>
parents:
929
diff
changeset
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26 #include <unistd.h> |
| 929 | 27 |
| 28 void pivot_root_main(void) | |
| 29 { | |
| 30 if (syscall(__NR_pivot_root, toys.optargs[0], toys.optargs[1])) | |
| 31 perror_exit("'%s' -> '%s'", toys.optargs[0], toys.optargs[1]); | |
| 32 } |