code: public EpollServerSocketChannelConfig setTcpDeferAccept(int deferAccept) {
          try {
              ((EpollServerSocketChannel) channel).socket.setTcpDeferAccept(deferAccept);
              return this;
          } catch (IOException e) {
              throw new ChannelException(e);
          }
      }
docs: Set the {@code TCP_DEFER_ACCEPT} option on the socket. See {@code man 7 tcp} for more details.