Re: GNUstep and session management

[Adrian Robert]

On Oct 7, 2005, at 3:50 PM, Sašo Kiselkov wrote:
> Let's just stop putting up theories about how it may or may not  
> work on OSX and
> instead start designing a way that would work for us.

I think we should try to follow OS X behavior to make things easier  
for people porting or maintaining cross-platform apps unless there's  
something broken in the way OS X does it.  Questions can be settled  
easily by running some test code on an OS X box.  I don't have time  
to write a test class right now but if someone sends me one I can  
compile it and try it out on Panther and Tiger and post the results  
here.

One thing I can verify for sure is that even without any explicit  
registration for notifications or delegate implementation, - 
terminate: gets called on the NSApp (with a nil sender) when a logout  
occurs.  Presumably -applicationShouldTerminate: is called on the  
delegate before that, at which point the app can veto it by returning  
NO (and on OS X this stops the logout).  10.4's Xcode docs show:

- (NSApplicationTerminateReply)applicationShouldTerminate: 
(NSApplication *)sender

Invoked from within the terminate: method immediately before the  
application terminates. sender is the NSApplication to be terminated.  
The value returned should be one of the values defined in  
“Constants”. For compatibility reasons, a return value of NO is  
equivalent to NSTerminateCancel, and a return value of YES is  
equivalent to NSTerminateNow.
(See Also: – terminate:, –  
applicationShouldTerminateAfterLastWindowClosed:, –  
applicationWillTerminate:)



I suspect this is what the desktop logout action is sending.