>> [...process reparenting...]
> Isn't what you want to do very similar to what happens when a process
> goes into background and the parent dies?
Yes. Between that and the partial reparenting that happens at debugger
attach, most of the code I want already exists.
The pieces that don't are things like dealing with control ttys and
sessions (reparenting orphaned processes to init deals with those, but
only in the form of setting them to a suitable "cleared" state; I would
want something more).
ISTR NetBSD shipped (ships? I can’t find it on cursory glance) a slimmed-down process controller (“slimmed-down” vs tmux or screen w their myriad options and features) process handler - I want to say “detach”, but I’m not certain.