Some instructions here <http://blog.refu.co/?p=1296> for creating a systemd “.service” file for running Emacs. Initially he did it as a privileged systemwide service, then he figured out how to make it per-user without needing special privileges. (Found in a user comment to this article <http://www.phoronix.com/scan.php?page=news_item&px=systemd-233>.)