code: def getPollFDList(self):
          
          pollfd_p_p = libusb1.libusb_get_pollfds(self.__context_p)
          if not pollfd_p_p:
              errno = get_errno()
              if errno:
                  raise OSError(errno)
              else:
                  # Assume not implemented
                  raise NotImplementedError(
                      'Your libusb does not seem to implement pollable FDs')
          try:
              result = []
              append = result.append
              fd_index = 0
              while pollfd_p_p[fd_index]:
                  append((
                      pollfd_p_p[fd_index].contents.fd,
                      pollfd_p_p[fd_index].contents.events,
                  ))
                  fd_index += 1
          finally:
              _free(pollfd_p_p)
          return result
docs: Return file descriptors to be used to poll USB events.
          You should not have to call this method, unless you are integrating
          this class with a polling mechanism.