old_contents: #!/usr/bin/env python
  
  import datetime
  import logging
  import multiprocessing
  import signal
  import sys
  
  import kcaa
  
  
  def main(argv):
      args = kcaa.flags.parse_args(argv[1:])
  
      logger = kcaa.logenv.setup_logger()
      logger.debug('Logger setup finished.')
  
      to_exit = multiprocessing.Event()
      p = multiprocessing.Process(target=kcaa.controller.control,
                                  args=(args, to_exit))
      p.start()
      logger.debug('Controller process started.')
  
      def handle_sigint(signal, frame):
          logger.info('SIGINT received in the main process. Exiting...')
          to_exit.set()
          p.join()
          sys.exit(0)
  
      signal.signal(signal.SIGINT, handle_sigint)
      p.join()
      logger.info('Shutting down the main process.')
  
  
  if __name__ == '__main__':
      main(sys.argv)
  
new_contents: #!/usr/bin/env python
  
  import multiprocessing
  import signal
  import sys
  
  import kcaa
  
  
  def main(argv):
      args = kcaa.flags.parse_args(argv[1:])
  
      logger = kcaa.logenv.setup_logger()
      logger.debug('Logger setup finished.')
  
      to_exit = multiprocessing.Event()
      p = multiprocessing.Process(target=kcaa.controller.control,
                                  args=(args, to_exit))
      p.start()
      logger.debug('Controller process started.')
  
      def handle_sigint(signal, frame):
          logger.info('SIGINT received in the main process. Exiting...')
          to_exit.set()
          p.join()
          sys.exit(0)
  
      signal.signal(signal.SIGINT, handle_sigint)
      p.join()
      logger.info('Shutting down the main process.')
  
  
  if __name__ == '__main__':
      main(sys.argv)
  
subject: Remove unused imports.