class_docstr: A kqueue-based event loop for BSD/Mac systems.
code: def fileno(self):
      return self._kqueue.fileno()
  
file_path: catboost/contrib/python/tornado/tornado-4/tornado/platform/kqueue.py
imports: from __future__ import absolute_import, division, print_function
  import select
  from tornado.ioloop import IOLoop, PollIOLoop
label_desc: Use image node_id 2 for calling the _KQueue obj's underlying member method code with example usage: obj.fileno() and returns: self