+/*-- in sync.c --*/
+/* Use this as a replacement for sync(2). */
+extern int sync_disks (void);
+
+/*-- in proto.c --*/
+extern void main_loop (int sock) __attribute__((noreturn));
+
+/* ordinary daemon functions use these to indicate errors
+ * NB: you don't need to prefix the string with the current command,
+ * it is added automatically by the client-side RPC stubs.
+ */