ktrace(1) on OpenBSD
The text dc9581b66226, as OpenBSD 6.5, OpenBSD 6.4, OpenBSD 6.3, OpenBSD 6.2, OpenBSD 6.1, OpenBSD 6.0 shipped it.
enable kernel process tracing
Flags it lists
-
-B -
-C -
-a -
-c -
-d -
-f -
-g -
-i -
-p -
-t