so_sndlowat
value = so->so_sndlowat;
so->so_sndlowat = intvalue;
so->so_sndlowat = sbl.sbl_txlowat;
nso->so_sndlowat = lso->so_sndlowat;
so->so_sndlowat = sbl.sbl_txlowat;
value = so->so_sndlowat;
if (so->so_sndlowat > so->so_sndbuf) {
so->so_sndlowat = so->so_sndbuf;
if (so->so_sndlowat > so->so_sndbuf) {
so->so_sndlowat = so->so_sndbuf;
nso->so_sndlowat = lso->so_sndlowat;