SSL_CTX_sessions() returns a pointer to the lhash databases containing the internal session cache for ctx.
The sessions in the internal session cache are kept in an lhash(3) type database. It is possible to directly access this database e.g. for searching. In parallel, the sessions form a linked list which is maintained separately from the lhash(3) operations, so that the database must not be modified directly but by using the SSL_CTX_add_session(3) family of functions.