key_sendup0
(void)key_sendup0(rp, n, 1, 0);
if ((error = key_sendup0(rp, n, 0, 0)) != 0) {
error = key_sendup0(sotorawcb(so), m, 0, sbprio);
static int key_sendup0(struct rawcb *, struct mbuf *, int, int);