c_linker_sym_t
int linker_ddb_lookup(const char *_symstr, c_linker_sym_t *_sym);
int linker_ddb_search_symbol(caddr_t _value, c_linker_sym_t *_sym,
int linker_ddb_symbol_values(c_linker_sym_t _sym, linker_symval_t *_symval);