+ if (pipe2(pp, O_CLOEXEC|O_NONBLOCK) < 0) {
+ log_error("Failed to allocate pipe: %m");
+ r = -errno;
+ goto finish;
+ }
+
+ sd_bus_message_unref(m);
+ m = NULL;
+ r = sd_bus_message_new_method_call(
+ bus,
+ "org.freedesktop.systemd.test",
+ "/",
+ "org.freedesktop.systemd.test",
+ "FileDescriptor",
+ &m);
+ if (r < 0) {
+ log_error("Failed to allocate method call: %s", strerror(-r));
+ goto finish;
+ }
+
+ r = sd_bus_message_append(m, "h", pp[1]);
+ if (r < 0) {
+ log_error("Failed to append string: %s", strerror(-r));
+ goto finish;
+ }
+
+ sd_bus_message_unref(reply);
+ reply = NULL;
+ r = sd_bus_send_with_reply_and_block(bus, m, 0, &error, &reply);
+ if (r < 0) {
+ log_error("Failed to issue method call: %s", bus_error_message(&error, -r));
+ goto finish;
+ }
+
+ errno = 0;
+ if (read(pp[0], &x, 1) <= 0) {
+ log_error("Failed to read from pipe: %s", errno ? strerror(errno) : "early read");
+ goto finish;
+ }
+