code: def handle_sighup(signum, frame):
      pass
  
imports: from test.support import verbose, reap_children
  from test.support.import_helper import import_module
  import errno
  import os
  import pty
  import tty
  import sys
  import select
  import signal
  import socket
  import io
  import unittest
  import warnings
label_desc: Use image node_id 2 for calling the PtyTest obj's underlying member method code with example usage: obj.handle_sighup(signum, frame) without return types