Here is a list of all documented variables with links to the struct/union documentation for each field:

on_before_sample_commit : DDS_DataReaderListener
on_before_sample_deserialize : DDS_DataReaderListener
on_data_available : DDS_DataReaderListener
on_data_on_readers : DDS_SubscriberListener
on_inconsistent_topic : DDS_TopicListener
on_instance_replaced : DDS_DataReaderListener
on_liveliness_changed : DDS_DataReaderListener
on_liveliness_lost : DDS_DataWriterListener
on_offered_deadline_missed : DDS_DataWriterListener
on_offered_incompatible_qos : DDS_DataWriterListener
on_publication_matched : DDS_DataWriterListener
on_reliable_reader_activity_changed : DDS_DataWriterListener
on_reliable_sample_unacknowledged : DDS_DataWriterListener
on_requested_deadline_missed : DDS_DataReaderListener
on_requested_incompatible_qos : DDS_DataReaderListener
on_sample_lost : DDS_DataReaderListener
on_sample_rejected : DDS_DataReaderListener
on_sample_removed : DDS_DataWriterListener
on_subscription_matched : DDS_DataReaderListener
options : OSAPI_ThreadProperty
ordered_access : DDS_PresentationQosPolicy
ownership : DDS_DataReaderQos, DDS_DataWriterQos, DDS_PublicationBuiltinTopicData, DDS_SubscriptionBuiltinTopicData
ownership_strength : DDS_DataWriterQos, DDS_PublicationBuiltinTopicData