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-.TH PIVOT_ROOT 2 "Feb 23, 2000" "Linux" "System Calls"
-.SH NAME
-pivot_root \- change the root file system
-.SH SYNOPSIS
-.B #include <linux/unistd.h>
-.sp
-.B _syscall2(int,pivot_root,const char *,new_root,const char *,put_old)
-.sp
-.BI "int pivot_root(const char *" new_root ", const char *" put_old );
-.SH DESCRIPTION
-\fBpivot_root\fP moves the root file system of the current process to the
-directory \fIput_old\fP and makes \fInew_root\fP the new root file system
-of the current process.
-
-The typical use of \fBpivot_root\fP is during system startup, when the
-system mounts a temporary root file system (e.g. an \fBinitrd\fP), then
-mounts the real root file system, and eventually turns the latter into
-the current root of all relevant processes or threads.
-
-\fBpivot_root\fP may or may not change the current root and the current
-working directory (cwd) of any processes or threads which use the old
-root directory. The caller of \fBpivot_root\fP
-must ensure that processes with root or cwd at the old root operate
-correctly in either case. An easy way to ensure this is to change their 
-root and cwd to \fInew_root\fP before invoking \fBpivot_root\fP.
-
-The paragraph above is intentionally vague because the implementation
-of \fBpivot_root\fP may change in the future. At the time of writing,
-\fBpivot_root\fP changes root and cwd of each process or
-thread to \fInew_root\fP if they point to the old root directory. This
-is necessary in order to prevent kernel threads from keeping the old
-root directory busy with their root and cwd, even if they never access
-the file system in any way. In the future, there may be a mechanism for
-kernel threads to explicitly relinquish any access to the file system,
-such that this fairly intrusive mechanism can be removed from
-\fBpivot_root\fP.
-
-Note that this also applies to the current process: \fBpivot_root\fP may
-or may not affect its cwd. It is therefore recommended to call
-\fBchdir("/")\fP immediately after \fBpivot_root\fP.
-
-The following restrictions apply to \fInew_root\fP and \fIput_old\fP:
-.IP \- 3
-They must be directories.
-.IP \- 3
-\fInew_root\fP and \fIput_old\fP must not be on the same file system as
-the current root.
-.IP \- 3
-\fIput_old\fP must be underneath \fInew_root\fP, i.e. adding a non-zero
-number of \fB/..\fP to the string pointed to by \fIput_old\fP must yield
-the same directory as \fInew_root\fP.
-.IP \- 3
-No other file system may be mounted on \fIput_old\fP.
-.PP
-See also \fBpivot_root(8)\fP for additional usage examples.
-
-If the current root is not a mount point (e.g. after \fBchroot(2)\fP or
-\fBpivot_root\fP, see also below), not the old root directory, but the
-mount point of that file system is mounted on \fIput_old\fP.
-.SH NOTES
-\fInew_root\fP does not have to be a mount point. In this case,
-\fB/proc/mounts\fP will show the mount point of the file system containing
-\fInew_root\fP as root (\fB/\fP).
-.SH "RETURN VALUE"
-On success, zero is returned.  On error, \-1 is returned, and
-\fIerrno\fP is set appropriately.
-.SH ERRORS
-\fBpivot_root\fP may return (in \fIerrno\fP) any of the errors returned by
-\fBstat(2)\fP. Additionally, it may return:
-
-.TP
-.B EBUSY
-\fInew_root\fP or \fIput_old\fP are on the current root file system,
-or a file system is already mounted on \fIput_old\fP.
-.TP
-.B EINVAL
-\fIput_old\fP is not underneath \fInew_root\fP.
-.TP
-.B ENOTDIR
-\fInew_root\fP or \fIput_old\fP is not a directory.
-.TP
-.B EPERM
-The current process does not have the administrator capability.
-.SH BUGS
-\fBpivot_root\fP should not have to change root and cwd of all other
-processes in the system.
-
-Some of the more obscure uses of \fBpivot_root\fP may quickly lead to
-insanity.
-.SH HISTORY
-\fBpivot_root\fP was introduced in Linux 2.3.41.
-.SH "SEE ALSO"
-.BR chdir(2),
-.BR chroot(2),
-.BR initrd(4),
-.BR pivot_root(8),
-.BR stat(2)