[JDEV] Server feature request

[David Waite]

kadokev at msg.net wrote:

> > Those are the definitions of those signals in BIND though. They have
> > different (already used) meaning within Jabber - they are used by pth
> > (and I believe MIO). They are simply user-defined signals.
>
> Right, exactly.
>
> So we pick two new signals to serve this purpose in Jabber, the concept is
> still the same. So we use SIGINFO to turn on debugging, and SIGWINCH to turn
> it off, or any two other signals that are not already taken.
>
> It would also be useful to have the ability to turn debugging on and off by
> sending an admin message, but the signal method is more important, as it would
> be very useful to debugging cases where I cannot connect/login at all, and thuse
> cannot send any messages...

I'd welcome "any two other signals which are not already taken." The system or parent
process sends those signals. I do not believe SIGINFO is defined on i386, its also
mapped to SIGPWR which is an exit on some other platforms, SIGWINCH is sent whenever
the terminal size changes - it sure wouldn't help me debug if the program behavior
changed when I resized the terminal I was getting output in :-).

If those signals weren't used internally, I agree it would be a really nice feature
to add (you actually only need one signal as a toggle, really). What is SIGUSR2
really used for?

> Kevin
>
> > -David Waite
> > kadokev at msg.net wrote:
> > >Server feature request, the ability to turn debugging on/off by sending a
> > >Unix signal to the jabberd process, something like this:
> > >
> > >     SIGUSR1   Turns on debugging; each SIGUSR1 increments debug level.
> > >               (SIGEMTon older systems without SIGUSR1.)
> > >
> > >     SIGUSR2   Turns off debugging completely.   (SIGFPEon older systems
> > >               without SIGUSR2.)
> > >
> > >The astute observer will notice that the two paragraphs above are verbatim from
> > >the documentation for BIND :-)
> ...
> > >>Yes!! It's been a long time I was thinking about it!
> > >>In certain cases it is just necessary...
> > >>
> > >>/MAciek
> > >>
> > >>On Thu, 10 May 2001 11:45:35 -0600 Malone, Pat wrote:
> > >>
> > >>>In trying to work through a nasty client problem today, I had 'if only'
> > >>>thought pass through my head.  So, here is a wish item for the jabberd
> > >>>developer gods:
> > >>>
> > >>> Enable the ability to send a sig of some kind to jabberd to toggle
> > >>>debugging on and off, a.k.a. the way debug can be toggled with named.
> > >>>
> > >>>It sure would be nice to toggle debug on when a problem shows up without
> > >>>having to kill the server.
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