I don't think there is, or should be, a way to do that. Granular copying of per-process resource state seems like a need that would be better served at either a

I don't think there is, or should be, a way to do that. Granular copying of per-process resource state seems like a need that would be better served at either a closer-to-the-program layer (i.e. debug hooks in code you control that provide information on how to reconstruct its state) or much further away (e.g. via CRIU/whole-machine snapshots or scary tricks like SIGSTP or ptrace-injecting calls to fork(2)). > I can be left unable to do certain things Most of what I can imagine of "certain things" falls into two categories: debugging (for which much better tools exist), or concerns that would be better served by a program providing an API of some kind rather than "go muck with state in $TMPDIR".