Here are the data structures with brief descriptions:

Ccmd_response_data_t	Response information for commands
Cconnection_watcher_data_t
Ccredentials_t	Structure of credential related information
Cfind_by_value_t	Structure to search a key by value
Cgsad_connection_info	Connection information
Cparam	Request parameter
Cuser	User information structure, for sessions
Cvalidator_rule	A validator rule