+int xnice(int);
+void xgettime(clockid_t clk_id, struct timespec *tp);
+void xnanosleep(const struct timespec *req, struct timespec *rem);
+#endif
+void xlisten(SOCKET, int);
+void xshutdown(SOCKET, int);
+void xsetsockopt(SOCKET, int, int, const void *, socklen_t);
+SOCKET xsocket(int, int, int);
+void xconnect(SOCKET, const struct sockaddr *, socklen_t);