be sure to also compare the library number.
ERR_GET_LIB(), ERR_GET_FUNC(), ERR_GET_REASON(), and ERR_FATAL_ERROR()
- are macros.
+are macros.
=head1 RETURN VALUES
The library number, function code, reason code, and whether the error
is fatal, respectively.
+Starting with OpenSSL 3.0.0, the function code is always set to zero.
=head1 SEE ALSO