Logging when child-server jobs start and end

We've just gotten a request from a customer of our Wintouch product, asking if there is a way we can log when the child-server jobs start and end, perhaps to a file.

The child-server job is spawned, under the user's own user profile, when the client connects, and terminates when either (1) the user closes the client, (2) it detects that the client has crashed or locked up, or (3) it encounters a fatal error of its own, or is manually terminated. It runs a mixed-language ILE program, with the communication layer handled in a C module which handles certain non-database requests on its own, and calls an RPG module to handle database requests.

It seems to me that logging child-server launches should be relatively easy, but what about logging terminations?

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JHHL