Re: desktop exit signals

[Jaap Karssenberg <j g karssenberg student utwente nl>]

zentara wrote  on 11/29/2005 06:54 PM:
> Jaap Karssenberg wrote:
> > I was wondering which signal I need to intercept if I want to know when 
> > the desktop exits while my application is still open. I tried catching 
> > SIGHUP, SIGTERM and SIGKILL but no luck so far. (The obvious purpose of 
> > this is to save the state of the application before it exits.)
>
> I have this working on ICEWM. It will save on a logout from X, but
> not a Control-Alt-Backspace. It will also save if you accidently
> hit the X in the Window Manager's toolbar.  You can prevent 
> Cntrl-Alt-BS in Xorg.conf, so it might be useful.
.. 8< .. Test script catching $SIG{INT} and $SIG{__DIE__}

Your test script doesn't work with the xfce desktop, so I'm afraid this 
behaviour is desktop-specific :( It would be nice if the desktop just 
send a SIGHUP before killing the X server.

The thing that makes me wonder is that my application exits with 
"Terminated" or with the error that the connection to the X server was 
lost. Either way I think it is Gtk that notices that the display is gone 
and throws an exception. So should it be possible to catch this 
exception from perl ? Or does Gtk exit immediatly without returning 
control to perl ?

This is a serious issue for me because I want to be sure all documents 
are saved before my application exits. I think exiting the desktop with 
the application still open should not be regarded as an abnormal exit.

Any help appreciated

-- Jaap <pardus cpan org>

P.S. now running gtk+ 2.8.7 with perl 5.8.7 and Gtk2 1.101