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Re: Background app running as root and logout process

Thanks to Garth, Chris, Marc and Jerry for your
suggestions. They will help me very much ...

Thanks again and regards!


--- Garth Cummings <email@hidden> wrote:
> Hi Robert,
>
> Since this involves Carbon and the window server,
> your questions are
> marginally related to Darwin. ;-)
>
> The window server will kill all of its clients at
> logout time. Period.
> That's because the window server itself will
> terminate and restart when
> the user logs out. That ensures that no process
> started by one user can
> potentially listen for events (like password
> keystrokes) generated by
> the next user. (The window server handles event
> dispatching as well as
> window management.)
>
> There were some changes in this area for Panther,
> but the classic
> solution has been for a startup item that does not
> use the window
> server to use System Configuration to watch for
> logouts and relaunch
> the BOA at that time.
>
> I don't think this is documented anywhere yet,
> although one of my DTS
> colleagues keeps threatening to...perhaps if you
> wrote DTS he'd give an
> answer for free since the issues are well-understood
> and no additional
> research would be necessary.
>
> Thanks,
> --gc
>
> On Feb 26, 2004, at 3:00 PM, Robert Fab wrote:
>
> > Hello everybody,
> >
> > I have a tool application which runs as a daemon
> on
> > startup. It just links against CoreServices
> framework
> > and installs a notifier for the login event. When
> it
> > detects a login, it launches another application.
> This
> > second one will run as a background-only app (BOA)
> and
> > it links against Carbon framework. Both run as
> root.
> >
> > The BOA calls RunApplicationEventLoop to install a
> > standard event handler.
> >
> > My problem is that running in Mac OS 10.3.2, after
> a
> > user logout, the loginwindow process tries to quit
> my
> > BOA and it can't. The Console shows me this alert:
> >
> > "login window: sendQuitEventToApp (myApp):
> > AESendWithMach returned error -1712"
> >
> > The -1712 error means time out. After that, my BOA
> is
> > killed.
> >
> > This is understandable because the BOA is running
> as
> > root and loginwindow as the logged user.
> >
> > I have seen a different behavior on early Jaguar
> > versions like 10.2.3, where the BOA replied to the
> > quit apple event.
> >
> > I don't want my BOA get killed because I need to
> do
> > some post-processing after RunApplicationEventLoop
> > call. Some ideas?
> >
> > Thanks in advance ...
> >
> >
> >
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>


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References: 
 >Re: Background app running as root and logout process (From: Garth Cummings <email@hidden>)



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