+#elif defined(MAC_OS_pre_X)
+#define get_last_socket_error() errno
+#define clear_socket_error() errno=0
+#define closesocket(s) MacSocket_close(s)
+#define readsocket(s,b,n) MacSocket_recv((s),(b),(n),true)
+#define writesocket(s,b,n) MacSocket_send((s),(b),(n))