code: def checkpoint_and_exit(
      self, signum: int, frame: tp.Optional[types.FrameType] = None
  ) -> None:
      # Note: no signal is actually bound to `checkpoint_and_exit` but this is used by plugins.
      self._logger.info(
          f"Caught signal {signal.Signals(signum).name} on {socket.gethostname()}"
      )
  
      procid = self.env.global_rank
      if procid:
          self._logger.info(
              f"Not checkpointing since I am a slave (procid={procid})."
          )
          # do not sys.exit, because it might kill the master task
          return
  
      delayed = self._delayed
      if hasattr(delayed.function, "checkpoint"):
          _checkpoint(
              self._delayed,
              self._job_paths.submitted_pickle,
              self._delayed._timeout_countdown,
          )
      self._exit()
  
imports: import os
  import signal
  import socket
  import sys
  import time
  import types
  import typing
  from pathlib import Path
  from .None import logger, utils
  from .utils import DelayedSubmission, JobPaths
label_desc: Use image node_id 5 for calling the SignalHandler obj's underlying member method code with example usage: obj.checkpoint_and_exit(signum, frame) without return types