The pb parameter is a pointer to a pblock data structure that contains values specified by the directive that invokes the SAF. A pblock data structure contains a series of name-value pairs.
For example, a directive that invokes the basic-nsca function might look like the following:
AuthTrans fn=basic-ncsa auth-type=basic dbm=users.db
In this case, the pb parameter passed to basic-ncsa contains name-value pairs that correspond to auth-type=basic and dbm=users.db.
NSAPI provides a set of functions for working with pblock data structures. For example, pblock_findval() returns the value for a given name in a pblock. For information on working with parameter blocks, see Parameter Block Manipulation Routines.