code: def libc_ver():
      """Try to determine the glibc version
  
      Returns a tuple of strings (lib, version) which default to empty strings
      in case the lookup fails.
      """
      glibc_version = glibc_version_string()
      if glibc_version is None:
          return ("", "")
      else:
          return ("glibc", glibc_version)
  
file_path: magnitude/glibc.py
imports: from __future__ import absolute_import
  import ctypes
  import re
  import warnings
label_desc: Use image node_id 4 for calling a global function with example usage: libc_ver() and returns: str,  str, str,  glibc_version