int len = ssh2_pkt_construct(); sk_write(s, pktout.data, len);
int len; int backlog; len = ssh2_pkt_construct(); backlog = sk_write(s, pktout.data, len); if (backlog > SSH_MAX_BACKLOG) ssh_throttle_all(1, backlog);
static void ssh2_pkt_send(void){    int len = ssh2_pkt_construct();    sk_write(s, pktout.data, len);}