TCP_IS_SOCKET
if (!TCP_IS_SOCKET(tcp))
!TCP_IS_SOCKET(tcp)) {
not_socket = !(TCP_IS_SOCKET(ltcp) &&
TCP_IS_SOCKET(tcp));
ASSERT(!TCP_IS_SOCKET(tcp));
ASSERT(TCP_IS_SOCKET(tcp));
if (!TCP_IS_SOCKET(listener)) {
ASSERT(!TCP_IS_SOCKET(acceptor));
ASSERT(!TCP_IS_SOCKET(eager));
ASSERT(!TCP_IS_SOCKET(listener));