--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pui-backend.h	Sun May 20 11:32:57 2018 +0200
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2018 Guido Berhoerster <guido+pui@berhoerster.name>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+ * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef	PUI_BACKEND_H
+#define	PUI_BACKEND_H
+
+#include <gio/gio.h>
+#include <glib-object.h>
+
+G_BEGIN_DECLS
+
+#define	PUI_TYPE_BACKEND	(pui_backend_get_type())
+
+#define	PUI_BACKEND_ERROR	(pui_backend_error_quark())
+
+G_DECLARE_FINAL_TYPE(PuiBackend, pui_backend, PUI, BACKEND, GObject)
+
+enum {
+    PUI_BACKEND_ERROR_GET_UPDATES_NOT_IMPLEMENTED
+};
+
+GQuark		pui_backend_error_quark(void);
+void		pui_backend_new_async(GCancellable *, GAsyncReadyCallback,
+    gpointer);
+PuiBackend *	pui_backend_new_finish(GAsyncResult *, GError **);
+
+G_END_DECLS
+
+#endif /* !PUI_BACKEND_H */