+
+int session_device_save(SessionDevice *sd) {
+ _cleanup_free_ char *state = NULL;
+ int r;
+
+ assert(sd);
+
+ /* Store device fd in PID1. It will send it back to us on
+ * restart so revocation will continue to work. To make things
+ * simple, send fds for all type of devices even if they don't
+ * support the revocation mechanism so we don't have to handle
+ * them differently later.
+ *
+ * Note: for device supporting revocation, PID1 will drop a
+ * stored fd automatically if the corresponding device is
+ * revoked. */
+ r = asprintf(&state, "FDSTORE=1\n"
+ "FDNAME=session-%s", sd->session->id);
+ if (r < 0)
+ return -ENOMEM;
+
+ return sd_pid_notify_with_fds(0, false, state, &sd->fd, 1);
+}
+
+void session_device_attach_fd(SessionDevice *sd, int fd, bool active) {
+ assert(fd > 0);
+ assert(sd);
+ assert(sd->fd < 0);
+ assert(!sd->active);
+
+ sd->fd = fd;
+ sd->active = active;
+}