code: def _stdin_ready_posix():
      """Return True if there's something to read on stdin (posix version)."""
      infds, outfds, erfds = select.select([sys.stdin], [], [], 0)
      return bool(infds)
  
imports: import os
  import platform
  import sys
  from distutils.version import LooseVersion
  from warnings import warn
label_desc: Use image node_id 1 for calling a global function with example usage: _stdin_ready_posix() and returns: bool