def glibc_version_string():
    # type: () -> Optional[str]
    "Returns glibc version string, or None if not using glibc."
    return glibc_version_string_confstr() or glibc_version_string_ctypes()
Returns glibc version string, or None if not using glibc.
product/gradle-plugin/src/main/python/pip/_internal/utils/glibc.py