ldattach(8) on OpenBSD
The text 39b80c6cb8fc, as OpenBSD 4.5, OpenBSD 4.4 shipped it.
attach a line discipline to a serial line
Flags it lists
-
-2 -
-7 -
-d -
-e -
-h -
-m -
-o -
-p -
-s -
-t