code: def start_reaper(fate_share=None):
      """Start the reaper process.
  
      This is a lightweight process that simply
      waits for its parent process to die and then terminates its own
      process group. This allows us to ensure that ray processes are always
      terminated properly so long as that process itself isn't SIGKILLed.
  
      Returns:
          ProcessInfo for the process that was started.
      """
      # Make ourselves a process group leader so that the reaper can clean
      # up other ray processes without killing the process group of the
      # process that started us.
      try:
          if sys.platform != "win32":
              os.setpgrp()
      except OSError as e:
          errcode = e.errno
          if errcode == errno.EPERM and os.getpgrp() == os.getpid():
              # Nothing to do; we're already a session leader.
              pass
          else:
              logger.warning(
                  f"setpgrp failed, processes may not be cleaned up properly: {e}."
              )
              # Don't start the reaper in this case as it could result in killing
              # other user processes.
              return None
  
      reaper_filepath = os.path.join(
          RAY_PATH, RAY_PRIVATE_DIR, "ray_process_reaper.py"
      )
      command = [sys.executable, "-u", reaper_filepath]
      process_info = start_ray_process(
          command,
          ray_constants.PROCESS_TYPE_REAPER,
          pipe_stdin=True,
          fate_share=fate_share,
      )
      return process_info
  
imports: import base64
  import collections
  import errno
  import io
  import json
  import logging
  import mmap
  import multiprocessing
  import os
  import random
  import shutil
  import signal
  import socket
  import subprocess
  import sys
  import time
  from pathlib import Path
  from typing import List, Optional, IO, AnyStr
  import psutil
  from filelock import FileLock
  import ray
  import ray._private.ray_constants
  from ray._raylet import GcsClient, GcsClientOptions
  from ray.core.generated.common_pb2 import Language
  from ray._private.ray_constants import RAY_NODE_IP_FILENAME
label_desc: Use image node_id 29 for calling a global function with example usage: start_reaper(fate_share) and returns: process_info, None