sock_bind
RL(rv = sock_bind(client, "0.0.0.0", 0));
RL(rv = sock_bind(client, "127.0.0.1", 0));
RL(rv = sock_bind(client, "0.0.0.0", CLIENTPORT));
RL(rv = sock_bind(client, "127.0.0.2", CLIENTPORT));
RL(rv = sock_bind(client, "127.0.0.3", CLIENTPORT));
RL(rv = sock_bind(client, "127.0.0.2", CLIENTPORT));
RL(rv = sock_bind(s, addr, port));