lostconn
sa.sa_handler = lostconn;
static void lostconn(int);
sa.sa_handler = lostconn;
lostconn();
lostconn();
lostconn();
void lostconn(void);
lostconn(0);
lostconn(0);
void lostconn(int);
(void) ssh_signal(SIGPIPE, lostconn);