From: Hugh Sasse <hgs@...>
Date: 2005-11-03T21:55:43+09:00
Subject: Re: Trapping errors.

On Thu, 3 Nov 2005, Robert Klemme wrote:

> Hugh Sasse wrote:
> > On Thu, 3 Nov 2005, Robert Klemme wrote:
> >
> >> This should get you started:
> >>
> >> set_trace_func lambda {|event, file, line, id, binding, classname|
> >>   $stderr.printf "th %10d: %-10s %s: %d\n", Thread.current.object_id,
> >> event, file, line if
> >>     /call|return/ =~ event
> >> }
> >>
> >> Good luck!
> >
> > thanks.  It did the trick.  I was hoisted by my own petard.
> 
> Although the meaning is obvious I had to look up "petard".  Did you know
> your proverb originates from Shaky?
> http://dictionary.reference.com/search?q=petard

I thought you meant "Shaking Stevens" for a minute! I know it was
Shakespearian in origin, but didn't know about the French and Latin
roots.  Makes one wonder about "petition"...
> 
> >       begin
> >         copy_entry s, d, options[:preserve],
> >       options[:dereference_root] rescue Exception, SystemCallError =>
> >         e stop = true
> >         if block_given?
> >           stop = yield s,d,e
> >         end
> >         raise if stop
> >       end
> >
> > Yes, I forgot to return nil from the *flaming* block! So it re-raised
> > because stop was true.
> 
> :-))  Silly us - this happens to me once in a while, too.

It seems to take so long to figure out.  Anyway, now I've a
shortcut.
> 
> > I didn't realize set_trace_func could be so useful.  I'd previously
> > considered it obscure.  Thank you for helping me out with this.
> 
> You're welcome!  I'm glad you finally managed to kill the beast. :-)
> 
> Kind regards
> 
>     robert
> 
        Thank you,
        Hugh
> 
>