[dtrace-discuss] ustack() question

[Adam Leventhal]

You're right that it's not explicitly stated, but if there's no associated
user context, ustack() should return an empty stack and ustackdepth should
have a value of 0.

Adam

On Wed, Jun 06, 2007 at 11:27:48AM -0700, Peter Lawrence wrote:
> 
> the Users Guide isn't explicit about what happens when ustack() is called
> and there isn't any user address space or stack associated with the
> current kernel thread.  It only gives examples where there certainly is,
> using the syscall provider.
> 
> I have used sched:::off-cpu to see user-stacks at context-switch events,
> and it seems to work just fine, but I'm wondering how to put in an
> explicit predicate for user-associated kernel threads...?...
> 
> thanks
> Pete Lawrence.
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-- 
Adam Leventhal, Solaris Kernel Development       http://blogs.sun.com/ahl