[Bug translator/5898] adapt stap -c for user probes

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From dsmith at redhat dot com  2008-03-11 17:01 -------
(In reply to comment #4)
> (In reply to comment #2)
> > I've just started working on a related, yet different, feature.  It is possible
> > that the feature this bug talks about could fall out from that work or be a
> > small addition to it.
> > 
> > I'm work on providing the ability to do something like:
> > 
> >   probe process("/bin/program_of_interest").create {
> >     # do something here...
> >   }
> >   probe process("/bin/program_of_interest").exit {
> >     # do something here...
> >   }
> > 
> > (I'm undecided on the exact syntax, so feel free to suggest something better.)
> 
> I think this will be a really useful feature.  It's always been on our
> user-space-probing wish list.
> 
> I wonder whether ".create" should be ".exec".  In particular, the process.create
> event in the process.stp tapset refers to fork/create, while process.exec refers
> to exec.

Obviously "create" isn't the right name, since I really had in mind a probe that
gets called for UTRACE_EVENT(CLONE).  Perhaps I should just call it "clone". 
We'd have a separate event called "exec" for UTRACE_EVENT(EXEC).

> > 
> > This will give you the capability to attach to existing or new instances of
> > /bin/program_of_interest system-wide.  I'm attempting to do this just with
utrace.
> 
> I'll be glad to see this.  I could never figure out how to do such a thing with
> utrace, without a specific ancestor process to start with.

You attach your utrace engine to all processes (in theory at least - I haven't
got anything working yet).  I'm basing my work on the utrace crash-suspend
example.  Look at the exit_crash_suspend() function to see basically what I'll
be doing.




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http://sourceware.org/bugzilla/show_bug.cgi?id=5898

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