code: def _glibc_version_string() -> Optional[str]:
      """Returns glibc version string, or None if not using glibc."""
      return (
          _glibc_version_string_confstr()
          or _glibc_version_string_ctypes()
      )
  
imports: import collections
  import contextlib
  import functools
  import os
  import re
  import sys
  import warnings
  from typing import Dict, Generator, Iterator, NamedTuple, Optional, Sequence, Tuple
  from ._elffile import EIClass, EIData, ELFFile, EMachine
label_desc: Use image node_id 7 for calling a global function with example usage: _glibc_version_string() and returns: unknown