kern_getrlimit
error = kern_getrlimit(uap->which, &lim);
int kern_getrlimit(u_int which, struct rlimit *limp);
error = kern_getrlimit(RLIMIT_FSIZE, &limit);
error = kern_getrlimit(RLIMIT_FSIZE, &limit);
error = kern_getrlimit(RLIMIT_FSIZE, &limit);
if (kern_getrlimit(RLIMIT_DATA, &limit))