code: def pre_fork(self, process_manager):
          '''
          Pre-fork we need to create the zmq router device
  
          :param func process_manager: An instance of salt.utils.process.ProcessManager
          '''
          salt.transport.mixins.auth.AESReqServerMixin.pre_fork(self, process_manager)
          process_manager.add_process(self.zmq_devicef pre_fork(self, process_manager):
          '''
          Pre-fork we need to create the zmq router device
  
          :param func process_manager: An instance of salt.utils.process.ProcessManager
          '''
          salt.transport.mixins.auth.AESReqServerMixin.pre_fork(self, process_manager)
          process_manager.add_process(self.zmq_device)
docs: Pre-fork we need to create the zmq router device
  
          :param func process_manager: An instance of salt.utils.process.ProcessManager