return s->sending_oob;
static void sk_tcp_write_oob(Socket sock, char *buf, int len){    Actual_Socket s = (Actual_Socket) sock;    /*     * Replace the buffer list on the socket with the data.     */    if (!s->head) {	s->head = smalloc(sizeof(struct buffer));    } else {	struct buffer *walk = s->head->next;	while (walk) {	    struct buffer *tmp = walk;	    walk = tmp->next;	    sfree(tmp);	}    }    s->head->next = NULL;    s->tail = s->head;    s->head->buflen = len;    memcpy(s->head->buf, buf, len);    /*     * Set the Urgent marker.     */    s->sending_oob = len;    /*     * Now try sending from the start of the buffer list.     */    if (s->writable)	try_send(s);}