Mac + Ruby: Can't access ioctl of Socket? How to fix?

Question

Good time of day.

Ruby Code:

def hw_address(iface)
    sock = Socket.new(Socket::AF_INET, Socket::SOCK_DGRAM,0)

    buf = [iface,""].pack('a16h16')
    sock.ioctl(SIOCGIFHWADDR, buf);

    sock.close

    return buf[18..24].to_etheraddr
end

puts hw_address('lo0')

What it do: gets mac-address of interface.

Works on Debian as expected. But on Mac OS X, im getting error: `ioctl': Operation not supported on socket (Errno::EOPNOTSUPP)

Is there anyway to fix/pass this error message & get working ioctl on Sockets?