MySQL version 5.5.3 and newer C client library/API supports multiple result sets for prepared CALL statements as described at:

http://dev.mysql.com/doc/refman/5.5/en/c-api-prepared-call-statements.html

I assume that this feature can not be directly imported to MariaDB 5.5 client library now that the MySQL client library does not have the FOSS license exception any more.

The relevant C API function is mysql_stmt_next_result() as documented at http://dev.mysql.com/doc/refman/5.5/en/mysql-stmt-next-result.html

In my application this feature happens to be very useful, thus I would like to file this as a feature request.