def METHOD_NAME():
    print("Hello.")
    sys.stdout.flush()
    clib_at_fork_demo.set_magic_number(3)
    clib_at_fork_demo.register_hello_from_child()
    clib_at_fork_demo.register_hello_from_fork_prepare()
    pid = os.fork()
    if pid == 0:
        print("Hello from child after fork.")
        sys.exit()
    print("Hello from parent after fork.")
    os.waitpid(pid, 0)
    print("Bye.")