Main loop for the CLI.

        return True if we should continue (no exit key has been pressed)

def __serve_forever(self):
        """Main loop for the CLI.

        return True if we should continue (no exit key has been pressed)
        """
        # Start a counter used to compute the time needed for
        # update and export the stats
        counter = Counter()

        # Update stats
        self.stats.update()
        logger.debug('Stats updated in {} seconds'.format(counter.get()))

        # Export stats
        counter_export = Counter()
        self.stats.export(self.stats)
        logger.debug('Stats exported in {} seconds'.format(counter_export.get()))

        # Patch for issue1326 to avoid < 0 refresh
        adapted_refresh = self.refresh_time - counter.get()
        adapted_refresh = adapted_refresh if adapted_refresh > 0 else 0

        # Display stats
        # and wait refresh_time - counter
        if not self.quiet:
            # The update function return True if an exit key 'q' or 'ESC'
            # has been pressed.
            ret = not self.screen.update(self.stats, duration=adapted_refresh)
        else:
            # Nothing is displayed
            # Break should be done via a signal (CTRL-C)
            time.sleep(adapted_refresh)
            ret = True

        return ret