dtrace discuss - Aug 2008 - Finding fully qualified symbol names.

I was trying a trick from the advanced Dtrace presentation and ran 
into a snag. Specifically, I was trying to do the trick called "Trick: 
sizeof and profiling". It says this:

When used with profile provider, sizeof allows function profiling:

profile-1234hz
/arg0 >= `clock &&
arg0 <= `clock + sizeof (`clock)/
{
...
}

The thing is, I wanted to do the same thing with a user land function. 
However, no matter what I did, I got an error about the function not 
being defined. The function in question was in a shared library and 
when I did a ustack, I got a symbol printed out. I tried the symbol as 
printed by ustack (which included the version part of the library 
name) and I tried it without the version, but neither worked.

What am I doing wrong? Or is it just not possible to do this for a 
userland function?
-- 
blu

There are two rules in life:
Rule 1- Don''t tell people everything you know
----------------------------------------------------------------------
Brian Utterback - Solaris RPE, Sun Microsystems, Inc.
Ph:877-259-7345, Em:brian.utterback-at-ess-you-enn-dot-kom

Hey Brian,

You can''t currently access symbols in a process'' address
space. We realize
that this is an annoying impediment. You can work around the problem by
using mdb(1) to figure out the symbol''s address and size.

Adam

On Mon, Aug 25, 2008 at 11:31:17AM -0400, Brian Utterback
wrote:
> I was trying a trick from the advanced Dtrace presentation and ran 
> into a snag. Specifically, I was trying to do the trick called "Trick:
> sizeof and profiling". It says this:
> 
> When used with profile provider, sizeof allows function profiling:
> 
> profile-1234hz
> /arg0 >= `clock &&
> arg0 <= `clock + sizeof (`clock)/
> {
> ...
> }
> 
> The thing is, I wanted to do the same thing with a user land function. 
> However, no matter what I did, I got an error about the function not 
> being defined. The function in question was in a shared library and 
> when I did a ustack, I got a symbol printed out. I tried the symbol as 
> printed by ustack (which included the version part of the library 
> name) and I tried it without the version, but neither worked.
> 
> What am I doing wrong? Or is it just not possible to do this for a 
> userland function?
> -- 
> blu
> 
> There are two rules in life:
> Rule 1- Don''t tell people everything you know
> ----------------------------------------------------------------------
> Brian Utterback - Solaris RPE, Sun Microsystems, Inc.
> Ph:877-259-7345, Em:brian.utterback-at-ess-you-enn-dot-kom
> _______________________________________________
> dtrace-discuss mailing list
> dtrace-discuss at opensolaris.org
-- 
Adam Leventhal, Fishworks                     http://blogs.sun.com/ahl