Add function for checking if a service is present

2 files changed, 45 insertions, 0 deletions

diff --git a/gdbus/gdbus.h b/gdbus/gdbus.h
index df065613..65b4fab9 100644
--- a/gdbus/gdbus.h
+++ b/gdbus/gdbus.h
@@ -37,6 +37,8 @@ typedef void (* GDBusWatchFunction) (DBusConnection *connection,
 DBusConnection *g_dbus_setup_bus(DBusBusType type, const char *name,
 							DBusError *error);
 
+gboolean g_dbus_check_service(DBusConnection *connection, const char *name);
+
 gboolean g_dbus_set_disconnect_function(DBusConnection *connection,
 				GDBusWatchFunction function,
 				void *user_data, DBusFreeFunction destroy);
diff --git a/gdbus/mainloop.c b/gdbus/mainloop.c
index ba6eb0b7..d6b37189 100644
--- a/gdbus/mainloop.c
+++ b/gdbus/mainloop.c
@@ -275,6 +275,49 @@ DBusConnection *g_dbus_setup_bus(DBusBusType type, const char *name,
 	return conn;
 }
 
+gboolean g_dbus_check_service(DBusConnection *connection, const char *name)
+{
+	DBusMessage *message, *reply;
+	const char **names;
+	int i, count;
+	gboolean result = FALSE;
+
+	message = dbus_message_new_method_call(DBUS_SERVICE_DBUS,
+			DBUS_PATH_DBUS, DBUS_INTERFACE_DBUS, "ListNames");
+	if (message == NULL) {
+		error("Can't allocate new message");
+		return FALSE;
+	}
+
+	reply = dbus_connection_send_with_reply_and_block(connection,
+							message, -1, NULL);
+
+	dbus_message_unref(message);
+
+	if (reply == NULL) {
+		error("Failed to execute method call");
+		return FALSE;
+	}
+
+	if (dbus_message_get_args(reply, NULL,
+				DBUS_TYPE_ARRAY, DBUS_TYPE_STRING,
+				&names, &count, DBUS_TYPE_INVALID) == FALSE) {
+		error("Failed to read name list");
+		goto done;
+	}
+
+	for (i = 0; i < count; i++)
+		if (g_str_equal(names[i], name) == TRUE) {
+			result = TRUE;
+			break;
+		}
+
+done:
+	dbus_message_unref(reply);
+
+	return result;
+}
+
 gboolean g_dbus_set_disconnect_function(DBusConnection *connection,
 				GDBusWatchFunction function,
 				void *user_data, DBusFreeFunction destroy)