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chroot - change root directory
int chroot(const char *path);
chroot() changes the root directory to that specified in path. This
directory will be used for path names beginning with /. The root
directory is inherited by all children of the current process.
Only a privileged process (Linux: one with the CAP_SYS_CHROOT
capability) may call chroot(2).
This call changes an ingredient in the pathname resolution process and
does nothing else.
This call does not change the current working directory, so that after
the call ‘.’ can be outside the tree rooted at ‘/’. In particular, the
superuser can escape from a ‘chroot jail’ by doing ‘mkdir foo; chroot
foo; cd ..’.
This call does not close open file descriptors, and such file
descriptors may allow access to files outside the chroot tree.
On success, zero is returned. On error, -1 is returned, and errno is
Depending on the file system, other errors can be returned. The more
general errors are listed below:
EACCES Search permission is denied on a component of the path prefix.
(See also path_resolution(2).)
EFAULT path points outside your accessible address space.
EIO An I/O error occurred.
ELOOP Too many symbolic links were encountered in resolving path.
path is too long.
ENOENT The file does not exist.
ENOMEM Insufficient kernel memory was available.
A component of path is not a directory.
EPERM The caller has insufficient privilege.
SVr4, SVID, 4.4BSD, X/OPEN. This function is not part of POSIX.1.
SVr4 documents additional EINTR, ENOLINK and EMULTIHOP error
conditions. X/OPEN does not document EIO, ENOMEM or EFAULT error
conditions. This interface is marked as legacy by X/OPEN.
FreeBSD has a stronger jail() system call.