chroot - change root directory
int chroot(const char *dirname)
Dirname is the address of the pathname of a directory, terminated by a
null byte. Chroot causes this directory to become the root directory,
the starting point for path names beginning with ``/''.
In order for a directory to become the root directory a process must have
execute (search) access to the directory.
This call is restricted to the super-user.
Upon successful completion, a value of 0 is returned. Otherwise, a value
of -1 is returned and errno is set to indicate an error.
Chroot will fail and the root directory will be unchanged if one or more
of the following are true:
[ENOTDIR] A component of the path name is not a directory.
[ENAMETOOLONG] The path name exceeds PATH_MAX characters.
[ENOENT] The named directory does not exist.
[EACCES] Search permission is denied for any component of the path
[ELOOP] Too many symbolic links were encountered in translating
the pathname. (Minix-vmd)
[EFAULT] Path points outside the process's allocated address space.
[EIO] An I/O error occurred while reading from or writing to the