docs: def cleanup_subprocesses():
      """On python exit: find possibly running subprocesses and kill them."""
      # pylint: disable=redefined-outer-name, reimported
      # atexit functions tends to loose global imports sometimes so reimport
      # everything what is needed again here:
      import os
      import errno
      from mirakuru.base_env import processes_with_env
      from mirakuru.compat import SIGKILL
  
      pids = processes_with_env(ENV_UUID, str(os.getpid()))
      for pid in pids:
          try:
              os.kill(pid, SIGKILL)
          except OSError as err:
              if err.errno != errno.ESRCH:
                  print("Can not kill the", pid, "leaked process", err)