para_fd_set(listen_fd, rfds, max_fileno);
list_for_each_entry_safe(hc, tmp, &clients, node) {
//PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);
para_fd_set(listen_fd, rfds, max_fileno);
list_for_each_entry_safe(hc, tmp, &clients, node) {
//PARA_DEBUG_LOG("hc %p on fd %d: status %d\n", hc, hc->fd, hc->status);