closed_socket?

in lib/puma/server.rb [126:142]

• 14 lines of code
• 7 McCabe index (conditional complexity)

      def closed_socket?(socket)
        return false unless socket.kind_of? TCPSocket
        return false unless @precheck_closing

        begin
          tcp_info = socket.getsockopt(Socket::SOL_TCP, Socket::TCP_INFO)
        rescue IOError, SystemCallError
          Thread.current.purge_interrupt_queue if Thread.current.respond_to? :purge_interrupt_queue
          @precheck_closing = false
          false
        else
          state = tcp_info.unpack(UNPACK_TCP_STATE_FROM_TCP_INFO)[0]
          
          (state >= 6 && state <= 9) || state == 11
        end
      end