I googled for systemd api interfaces and this was the first thing I got:<p><a href="http:&#x2F;&#x2F;www.freedesktop.org&#x2F;wiki&#x2F;Software&#x2F;systemd&#x2F;InterfacePortabilityAndStabilityChart&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.freedesktop.org&#x2F;wiki&#x2F;Software&#x2F;systemd&#x2F;InterfacePo...</a>