dtrace discuss - Nov 2008 - DTrace helper interface''s deprecated ioctls

Hi,

Is there a specific reason the DTRACEHIOC_REMOVE ioctl is deprecated?
I found I needed to use it in my Perl USDT provider code[*], which
creates providers dynamically at runtime. I wonder if I''m missing a
better way of doing the same thing.

The situation I''m handling with the remove operation is killing and
recreating a perl interpreter in the same process, which
Apache/mod_perl does on startup. Without the remove call, the probes
created by the first interpreter are still around, but are unknown to
the second interpreter - a subsequent ADDDOF for the same provider
doesn''t appear to update existing probes.


Thanks,
Chris.

* -
http://search.cpan.org/~chrisa/Devel-DTrace-Provider-0.02/lib/Devel/DTrace/Provider.pm

Hi Chris,

It appears that the comment in dtrace.h regarding DTRACEHIOC_REMOVE
is just wrong. If I remember correctly, when I added DTRACEHIOC_ADDDOF
I had considered adding a new remove version as well, but didn''t end
up needing it. I believe that that was the source of the comment.

That perl module is very very cool; nice work! It''s a bit like the
JUSDT stuff that the Java folks have been working on. Should we call
it PSDT?

The support for removing providers is a bit spotty so you many
encounter some problems. Please let me/us know if/when you do.

Adam

On Nov 24, 2008, at 8:33 AM, Chris Andrews wrote:
> Hi,
>
> Is there a specific reason the DTRACEHIOC_REMOVE ioctl is deprecated?
> I found I needed to use it in my Perl USDT provider code[*], which
> creates providers dynamically at runtime. I wonder if I''m missing
a
> better way of doing the same thing.
>
> The situation I''m handling with the remove operation is killing
and
> recreating a perl interpreter in the same process, which
> Apache/mod_perl does on startup. Without the remove call, the probes
> created by the first interpreter are still around, but are unknown to
> the second interpreter - a subsequent ADDDOF for the same provider
> doesn''t appear to update existing probes.
>
>
> Thanks,
> Chris.
>
> * -
http://search.cpan.org/~chrisa/Devel-DTrace-Provider-0.02/lib/Devel/DTrace/Provider.pm
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org

--
Adam Leventhal, Fishworks                        http://blogs.sun.com/ahl