docs: def main_real(usercode, netobj, options):
      '''
      Entrypoint function for non-test ("real") mode.  At this point
      we assume that we are running as root and have pcap module.
      '''
      usercode_entry_point = import_or_die(usercode, ('main', 'switchy_main'))
      if options.dryrun:
          log_info("Imported your code successfully.  Exiting dry run.")
          netobj.shutdown()
          return
  
      try:
          _start_usercode(usercode_entry_point, netobj, options.codearg)
      except Exception as e:
          import traceback
  
          log_failure("Exception while running your code: {}".format(e))
          message = '''{0}
  
  This is the Switchyard equivalent of the blue screen of death.
  Here (repeating what's above) is the failure that occurred:
  '''.format('*'*60, textwrap.fill(str(e), 60))
          with red():
              print(message)
              traceback.print_exc(1)
              print('*'*60)
  
          if options.nohandle:
              raise 
              
          if not options.nopdb:
              print('''
  I'm throwing you into the Python debugger (pdb) at the point of failure.
  If you don't want pdb, use the --nopdb flag to avoid this fate.
  ''')
              import pdb
              pdb.post_mortem()
      else:
          netobj.shutdown()