code: def _set_nonblocking(fd):
      flags = fcntl.fcntl(fd, fcntl.F_GETFL)
      fcntl.fcntl(fd, fcntl.F_SETFL, flags | os.O_NONBLOCK)
  
file_path: catboost/contrib/python/tornado/tornado-4/tornado/platform/posix.py
imports: from __future__ import absolute_import, division, print_function
  import fcntl
  import os
  from tornado.platform import common, interface
label_desc: Use image node_id 2 for calling a global function with example usage: _set_nonblocking(fd) without return types