auparse_next_record will move the internal library cursors to point to the next record of the current event. You should not call this function from a feed interface callback function. Doing so will deadlock the code. In that scenario, you should check the number of records in the current event with auparse_get_num_records and only call this if there are more records.
Returns -1 if an error occurs, 0 if no more records in current event, or 1 for success.