+extern int setsockopt(int socket, int level, int option_name, const void *option_value, socklen_t option_len);
+extern int getsockopt(int socket, int level, int option_name, void *option_value, socklen_t *option_len);
+
+extern int getsockname(int socket, struct sockaddr *addr, socklen_t *addrlen);
+extern int getpeername(int socket, struct sockaddr *addr, socklen_t *addrlen);
+