code: public EpollTcpInfo tcpInfo(EpollTcpInfo info) {
          try {
              socket.getTcpInfo(info);
              return info;
          } catch (IOException e) {
              throw new ChannelException(e);
          }
      }
docs: Updates and returns the {@code TCP_INFO} for the current socket.
  See <a href="http://linux.die.net/man/7/tcp">man 7 tcp</a>.