+static void do_idle_pipe_dance(int idle_pipe[4]) {
+ assert(idle_pipe);
+
+ if (idle_pipe[1] >= 0)
+ close_nointr_nofail(idle_pipe[1]);
+ if (idle_pipe[2] >= 0)
+ close_nointr_nofail(idle_pipe[2]);
+
+ if (idle_pipe[0] >= 0) {
+ int r;
+
+ r = fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT_USEC);
+
+ if (idle_pipe[3] >= 0 && r == 0 /* timeout */) {
+ /* Signal systemd that we are bored and want to continue. */
+ write(idle_pipe[3], "x", 1);
+
+ /* Wait for systemd to react to the signal above. */
+ fd_wait_for_event(idle_pipe[0], POLLHUP, IDLE_TIMEOUT2_USEC);
+ }
+
+ close_nointr_nofail(idle_pipe[0]);
+
+ }
+
+ if (idle_pipe[3] >= 0)
+ close_nointr_nofail(idle_pipe[3]);
+}
+