void deallocate_user_data(struct CitContext *con);
void *CtdlGetUserData(unsigned long requested_sym);
void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes);
void deallocate_user_data(struct CitContext *con);
void *CtdlGetUserData(unsigned long requested_sym);
void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes);