chroot - change root directory

Description	path points to a pathname naming a directory. The chroot() function causes the nameddirectory to become the root directory, i.e. the starting point for path searches for pathnames beginning with /. The working directory of the user is not affected by chroot(). The process must have appropriate privileges to change the root directory. The .. (dot-dot) entry in the root directory is interpreted to mean the root directory itself. Thus, .. cannot be used to access files outside the subtree rooted at the root directory. chroot() is not reentrant.
Return val.	0 -1	if successful if an error occurs. errno is set to indicate the error.
Errors	chroot() will fail if:
	EACCES	Search permission is denied for a component of path.
	Extension
	EFAULT EINTR ELOOP	An invalid address was passed as an argument. A signal was caught during the chroot() system call. Too many symbolic links were encountered in resolving path. (End)
	ENAMETOOLONG
		The length of the path argument exceeds {PATH_MAX} or a pathname component is longer than {NAME_MAX}.
	ENOENT	path points to the name of a directory that does not exist or to an empty string.
	ENOTDIR	A component of the pathname path is not a directory .
	EPERM	The effective user ID is not that of a process with appropriate privileges.
Notes	chroot() is executed only for POSIX directories. chroot() works only in the currently active process and remains in effect only until the termination of that process.
See also	chdir(), unistd.h.