sk_write(s, deferred_send_data, deferred_len);
int backlog; backlog = sk_write(s, deferred_send_data, deferred_len);
static void ssh_pkt_defersend(void){    sk_write(s, deferred_send_data, deferred_len);    deferred_len = deferred_size = 0;    sfree(deferred_send_data);    deferred_send_data = NULL;}