sk_write(s, pktout.data, len);
backlog = sk_write(s, pktout.data, len); if (backlog > SSH_MAX_BACKLOG) ssh_throttle_all(1, backlog);
static void s_wrpkt(void){    int len;    len = s_wrpkt_prepare();    sk_write(s, pktout.data, len);}