Doors in the Wild
A nice and accurate survey of doors in illumos-gate
10.42% Complete
The Tradecraft section describes common door techniques observed in illumos-gate. It is not a set of recommendations; it describes merely what is, not necessarily what should be.
The Sightings section details non-trivial use of doors in various daemons, administrative tools, and kernel components. Sightings are grouped by major topic area, and may occasionally span more than one executable or library.
The Miscellany section details trivial use of doors, some of which is clever or interesting or funny, and some of which is not.