write0

# File lib/net/protocol.rb, line 272
    def write0(*strs)
      @debug_output << strs.map(&:dump).join if @debug_output
      orig_written_bytes = @written_bytes
      strs.each_with_index do |str, i|
        need_retry = true
        case len = @io.write_nonblock(str, exception: false)
        when Integer
          @written_bytes += len
          len -= str.bytesize
          if len == 0
            if strs.size == i+1
              return @written_bytes - orig_written_bytes
            else
              need_retry = false
              # next string
            end
          elsif len < 0
            str = str.byteslice(len, -len)
          else # len > 0
            need_retry = false
            # next string
          end
          # continue looping
        when :wait_writable
          (io = @io.to_io).wait_writable(@write_timeout) or raise Net::WriteTimeout.new(io)
          # continue looping
        end while need_retry
      end
    end