code: def default_signal_map():
      
      name_map = {
          'SIGTSTP': None,
          'SIGTTIN': None,
          'SIGTTOU': None,
          'SIGTERM': 'terminate'}
      signal_map = {}
      for name, target in list(name_map.items()):
          if hasattr(signal, name):
              signal_map[getattr(signal, name)] = target
      return signal_map
docs: Create the default signal map for this system.
  
      :return: dict