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

[jkenisto at us dot ibm dot com]

------- Additional Comments From jkenisto at us dot ibm dot com  2008-03-11 16:43 -------
(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.

> 
> 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.

> 
> In terms of what I'm working on, I think your requested feature becomes:
> 1. use utrace to watch the pid of the shell (instead of the entire system)
> 2. look for the exec of 'pgm'
> 3. attach the user utrace/uprobes probes to the newly created 'pgm'
> 
> Is this what you are looking for?

Yes.

-- 


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

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