xconnect
err = xconnect(s, sockaddr(&addr), len);
err = xconnect(c, sockaddr(&addr), len);
err = xconnect(c0, sockaddr(&addr), len);
err = xconnect(p0, sockaddr(&addr), len);
xconnect(c, sockaddr(&addr), len);
xconnect(c, sockaddr(&addr), len);
err = xconnect(c, sockaddr(&addr), len);
err = xconnect(c, sockaddr(&addr), len);
err = xconnect(c, (struct sockaddr *)&addr, sizeof(addr));
err = xconnect(s, &unspec, sizeof(unspec));
err = xconnect(c, sockaddr(&addr), len);