output-filter-function or equivalent for term.el?

output-filter-function or equivalent for term.el?

[rocky]

Recently I have been rewriting debugger prompt tracking code. Probably
the oldest and most familiar one may be turn-on-pdbtrack from python-
mode.el. The way code like this works is to add a hook to comint-
output-filter-functions. Having done that and being pleased with the
work, I created a similar hook for eshell. All pretty simply done by
adding a hook to eshell-output-filter-functions.

But I don't see anything for eterm.el. I see a hook which will get
called before input is sent to a process, but no hook when the process
is waiting on input or has new output.

Suggestions? Thanks.