+static int lock_sessions(DBusConnection *bus, char **args, unsigned n) {
+ DBusMessage *m = NULL, *reply = NULL;
+ int ret = 0;
+ DBusError error;
+
+ assert(bus);
+ assert(args);
+
+ dbus_error_init(&error);
+
+ polkit_agent_open_if_enabled();
+
+ m = dbus_message_new_method_call(
+ "org.freedesktop.login1",
+ "/org/freedesktop/login1",
+ "org.freedesktop.login1.Manager",
+ "LockSessions");
+ if (!m) {
+ log_error("Could not allocate message.");
+ ret = -ENOMEM;
+ goto finish;
+ }
+
+ reply = dbus_connection_send_with_reply_and_block(bus, m, -1, &error);
+ if (!reply) {
+ log_error("Failed to issue method call: %s", bus_error_message(&error));
+ ret = -EIO;
+ goto finish;
+ }
+
+finish:
+ if (m)
+ dbus_message_unref(m);
+
+ if (reply)
+ dbus_message_unref(reply);
+
+ dbus_error_free(&error);
+
+ return ret;
+}
+