mdb_ctf_func_args
extern int mdb_ctf_func_args(const mdb_ctf_funcinfo_t *, uint_t,
if (ctf && mdb_ctf_func_args(&mcfi, nargc, argtypes) != 0)
if (mdb_ctf_func_args(&mfp, 5, args_types) == CTF_ERR)