The compositor from the previous section has a bug: it can't be exited from if it is started in DRM. This is a pretty serious bug, one that will be addressed in two ways in this section.

The first is the most extreme, and easiest to implement, option: adding a shut down key sequence. The compositor will be configured so if the user presses Ctrl+Shift+Escape it will gracefully terminate with a zero exit status. This will be useful in debugging the compositor as it makes it easy to shut down even in DRM.¹

The second escape access is a feature that is often taken for granted: the ability to switch TTYs. The standard Ctrl+Alt+F# sequence will be implemented to switch TTYs when the compositor is running on DRM. When it's running on another backend it will simply ignore that (since it won't have the proper access controls to do the context switch).

This chapter will primarily concern itself with setting up handlers for the first time, handling keyboard input, and learning to use wlroots-rs handles.