ERR_reason_error_string() return the library name, function
name and reason string respectively.
-The OpenSSL error strings should be loaded by calling
-L<ERR_load_crypto_strings(3)> or, for SSL
-applications, L<SSL_load_error_strings(3)>
-first.
If there is no text string registered for the given error code,
the error string will contain the numeric code.
=head1 SEE ALSO
L<err(3)>, L<ERR_get_error(3)>,
-L<ERR_load_crypto_strings(3)>,
-L<SSL_load_error_strings(3)>
L<ERR_print_errors(3)>
=cut