Matching function parameters and corresponding return value

[Sylvain Fourmanoit <syfou at users dot sourceforge dot net>]

Hi all,

I would like to watch calls to a preemptible function such as sys_open():
ideally, I would like to know both the tentatively accessed files and the 
success (or not) of the various calls.

But I don't see how to do this: of course, I can without problem 
register a jprobe and a kretprobe on sys_open(), both how do I correlate 
pairs of probe calls reliably? Or is it just the wrong approach?

Any insight on how to do this, either with SystemTap or directly 
with Kprobes would be really appreciated!

--
Sylvain <syfou@users.sourceforge.net>

"Don't fear the pen. When in doubt, draw a pretty picture."
   --Baker's Third Law of Design.