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33 lines
864 B
33 lines
864 B
/* pivot_root.c - edit system mount tree
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*
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* Copyright 2012 Rob Landley <rob@landley.net>
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USE_PIVOT_ROOT(NEWTOY(pivot_root, "<2>2", TOYFLAG_SBIN))
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config PIVOT_ROOT
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bool "pivot_root"
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default y
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help
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usage: pivot_root OLD NEW
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Swap OLD and NEW filesystems (as if by simultaneous mount --move), and
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move all processes with chdir or chroot under OLD into NEW (including
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kernel threads) so OLD may be unmounted.
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The directory NEW must exist under OLD. This doesn't work on initramfs,
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which can't be moved (about the same way PID 1 can't be killed; see
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switch_root instead).
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*/
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#define FOR_pivot_root
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#include "toys.h"
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#include <sys/syscall.h>
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#include <unistd.h>
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void pivot_root_main(void)
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{
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if (syscall(__NR_pivot_root, toys.optargs[0], toys.optargs[1]))
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perror_exit("'%s' -> '%s'", toys.optargs[0], toys.optargs[1]);
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}
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