Seems rr is using fork for its implementation. The first time I've seen this approach taken is in Ocaml's debugger.[1] [1] http://caml.inria.fr/pub/docs/manual

Seems rr is using fork for its implementation. The first time I've seen this approach taken is in Ocaml's debugger.[1] [1] http://caml.inria.fr/pub/docs/manual-ocaml/debugger.html http://caml.inria.fr/pub/docs/manual-ocaml/debugger.html