void *CtdlGetUserData(unsigned long requested_sym);
void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes);
int CtdlGetDynamicSymbol(void);
void *CtdlGetUserData(unsigned long requested_sym);
void CtdlAllocUserData(unsigned long requested_sym, size_t num_bytes);
int CtdlGetDynamicSymbol(void);