extend the translator to support a family of probe points:

probe procfs("PATH").read { $value = do_something () }
probe procfs("PATH").write { do_something_else ($value) }

These probe points would map to straightforward procfs slots with read/write
handlers mapping to the handler bodies.  The $value var would map to the byte
string being read/written by the user program.

These could be a simple generic mechanism through which a systemtap script could
interact with a user-level monitor program.