libsystemd-bus: add lightweight object vtable implementation for exposing objects on the bus

This adds a lightweight scheme how to define interfaces in static fixed
arrays which then can be easily registered on a bus connection. This
makes it much easier to write bus services.

This automatically handles implementation of the Properties,
ObjectManager, and Introspection bus interfaces.

1 files changed, 41 insertions, 0 deletions

diff --git a/src/libsystemd-bus/bus-introspect.h b/src/libsystemd-bus/bus-introspect.h
new file mode 100644
index 0000000000..48c3885d94
--- /dev/null
+++ b/src/libsystemd-bus/bus-introspect.h
@@ -0,0 +1,41 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/types.h>
+#include <stdio.h>
+
+#include "sd-bus.h"
+#include "set.h"
+
+struct introspect {
+        FILE *f;
+        char *introspection;
+        size_t size;
+};
+
+int introspect_begin(struct introspect *i);
+int introspect_write_default_interfaces(struct introspect *i, bool object_manager);
+int introspect_write_child_nodes(struct introspect *i, Set *s, const char *prefix);
+int introspect_write_interface(struct introspect *i, const char *interface, const sd_bus_vtable *v);
+int introspect_finish(struct introspect *i, sd_bus *bus, sd_bus_message *m, sd_bus_message **reply);
+void introspect_free(struct introspect *i);