dtrace discuss - Mar 2007 - Problem about pid provider

Hi guys,

    I''ve got a question about pid provider. Attachments are the test
case for that.

% cc test.c
% dtrace -s main.d -c ./a.out
dtrace: script ''main.d'' matched 3 probes
Hello, world.
dtrace: pid 1982 has exited
CPU     ID                    FUNCTION:NAME
  1  69948                      main:return exit.

    From the output, the probe "pid$target:a.out:main:entry"
didn''t
fire. I''m using Solaris Nevada snv_56 X86. For Solaris 10u2 SPARC, the
probe did fire in this case. Anything suggestions?

Thanks,
-Alfred

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Hi Alfred,

This is a bug in DTrace. The problem is that dtrace(1M) creates a breakpoint
at the start of main() and that prevents the pid provider from properly
instrumenting main:entry. It should be relatively easy to fix. If you''d
like
to file a bug, that would be great; otherwise I''ll be happy to do it.

Adam

On Thu, Mar 15, 2007 at 08:44:34PM +0800, Alfred Peng
wrote:
> Hi guys,
> 
>     I''ve got a question about pid provider. Attachments are the
test
> case for that.
> 
> % cc test.c
> % dtrace -s main.d -c ./a.out
> dtrace: script ''main.d'' matched 3 probes
> Hello, world.
> dtrace: pid 1982 has exited
> CPU     ID                    FUNCTION:NAME
>   1  69948                      main:return exit.
> 
>     From the output, the probe "pid$target:a.out:main:entry"
didn''t
> fire. I''m using Solaris Nevada snv_56 X86. For Solaris 10u2 SPARC,
the
> probe did fire in this case. Anything suggestions?
> 
> Thanks,
> -Alfred
> 
> #!/usr/sbin/dtrace -s
> 
> pid$target:a.out:main:entry
> {
>   started = 1;
>   printf("Enter into main.");
> }
> 
> pid$target:a.out:main:return
> /started == 1/
> {
>   printf("Return from main.");
> }
> 
> pid$target:a.out:main:return
> {
>   printf("exit.");
>   exit(0);
> }
> 
> int main()
> {
>   printf("Hello, world.\n");
>   return 0;
> }
> 
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
-- 
Adam Leventhal, Solaris Kernel Development       http://blogs.sun.com/ahl