sbspace
tlen <= sbspace(&so->so_rcv)) {
win = sbspace(&so->so_rcv);
win = sbspace(&so->so_rcv);
win = sbspace(&so->so_rcv);
if (sbspace(&so->so_snd) < -512) {
if (sbspace(&so->so_snd) >= rep->r_mreq->m_pkthdr.len &&
return ((sbspace(&so->so_snd) >= so->so_snd.sb_lowat &&