do_sys_waitid
error = do_sys_waitid(idtype, id, &pid, &status, options, &wru, &info);
int error = do_sys_waitid(idtype, id, &pid, &status,
ret = do_sys_waitid(idtype, id, pid, status, options, ru ? &wru : NULL,
error = do_sys_waitid(idtype, id, &pid, &status, SCARG(uap, options),
int do_sys_waitid(idtype_t, id_t, int *, int *, int, struct wrusage *,