code: def recv(self, x=BPF_BUFFER_LENGTH):
          
  
          if self.buffered_frames():
              # Get a frame from the buffer
              return self.get_frame()
  
          # Get data from BPF
          try:
              bpf_buffer = os.read(self.ins, x)
          except EnvironmentError as exc:
              if exc.errno != errno.EAGAIN:
                  warning("BPF recv()", exc_info=True)
              return
  
          # Extract all frames from the BPF buffer
          self.extract_frames(bpf_buffer)
          return self.get_frame()
docs: Receive a frame from the network