Here are the data structures with brief descriptions:

Cattack_atom
Cattack_start_args
Chash
Chost	Host information, implemented as doubly linked list
Clist
Cnasl_thread_args
Copenvassd_option
Cplist
Cplugins_scheduler
Crunning	Structure to represent a process in the sense of a running NVT
Cscheduler_plugin