sbreserve
sbreserve(sb, cnt)) {
if (sbreserve(&so->so_snd, sndcc))
if (sbreserve(&so->so_rcv, rcvcc))
(void)sbreserve(&so->so_snd, bufsize);
(void)sbreserve(&so->so_rcv, bufsize);
sbreserve(&so->so_snd, nmax);
sbreserve(&so->so_rcv, nmax);
int sbreserve(struct sockbuf *, u_long);