Nigel S wrote:
> I'm a newbie as dtrace, but couldn't find an answer to this by searching
> :
>
> For example, I have function "lsearch" which is called in many different
> places. It's also called by "composemessage".
>
> I have been able to successfully create a script which show the return
> values of "lsearch". Now what I would like to do, is for it to only show
> the return value of "lsearch" when it's called by "composemessage".
Hi Nigel,
perhaps something like this might work for you:
===========================================================
#!/usr/sbin/dtrace
pid$target::*composemessage*:entry
{
self->composed = 1;
}
pid$target::*lsearch*:entry
/self->composed/
{
ustack(10);
}
pid$target::*lsearch*:return
/self->composed/
{
printf("returning %d", arg1);
self->composed = 0;
}
===========================================================
You should have a look in the DTrace manual for info about
predicates.
hth,
James C. McPherson
--
Senior Kernel Software Engineer, Solaris
Sun Microsystems
http://blogs.sun.com/jmcp http://www.jmcp.homeunix.com/blog
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