def nl_socket_get_cb(sk):
return sk.s_cb<EOL>
Get the current nl_cb callback handler stored in the nl_sock socket.

    https://github.com/thom311/libnl/blob/libnl3_2_25/lib/socket.c#L609

    Positional arguments:
    sk -- Netlink socket (nl_sock class instance).

    Returns:
    nl_cb class instance.