Re: How to reconnect to a new X Server

[Stefan Bidi]

I'm not very familiar with AppKit programming, but can't you just call [NSApplication-run] yourself in a while loop?  You'd probably have to do all the setup that NSApplicationMain() does before and after calling it, but if it works the way I think it should, you wouldn't need a wrapper binary.

Just an idea.

Stef

On Wed, May 22, 2013 at 7:40 AM, Sebastian Reitenbach <sebastia@l00-bugdead-prods.de> wrote:

On Wednesday, May 22, 2013 11:55 CEST, "Dr. H. Nikolaus Schaller" <hns@goldelico.com> wrote:

>
> Am 22.05.2013 um 11:34 schrieb Sebastian Reitenbach:
>
> > Hi,
> >
> > working with Riccardo on GAPs loginpanel, made some progress, but ran into trouble now.
> >
> > What I do is starting the X Server, before I then start the loginpanel application.
> > Then the loginpanel actually has an X server running, where it can connect to.
> >
> > So far, that works well. I can login. When I logout, then I am killing the X server, and
> > want to restart it, and spawn the loginpanel again.
> >
> > First I tried in loginpanels main function:
> >
> >   while (1)
> >     {
> >       [XManager startXServer];
> >       putenv("DISPLAY=:0.0");
> >
> >       NSApplicationMain(argc, argv);
> >
> >     }
> >
> >
> > That probably was too naive from me thinking it might work ;) Reading up NSApplication
> > documentation, I see that everything after NSApplicationMain(argc, argv); will not be
> > exectuted, so the while loop will only runs once :(
> >
> > Anyways, then I tried to start the XServer again, after I teared it down.
> > That works so far, but when the loginpanel wants to reset its window on the X server,
> > I see it crying on the console, that the connection to the XServer broke:
> >
> > X connection to :0.0 broken (explicit kill or server shutdown)
> >
> > Even if there is a new server spawned already on the same display.
> >
> > Is there a way to tell the application that the X Server disappeared, and it
> > should reconnect to the new one? Or tell it to kind of respawn itself?
>
> I think what you are looking for should be done in the startx or xinit scripts of
> your system. They are usually responsible for restarting X servers. Also
> initd and its run-levels play some role.
>
> So the loginpanel should also be restarted by the same mechanism.
> I.e. you could try to make it sort of a display and/or window manager.

I thought more the lines of XDM, when the X server it spawns gets killed,
its restarting it, showing the login greeter again.

I looked at Login.app from mGSTEP as an example:
http://www.illumenos.com/os/mgstep/projects.html

I could write an init script , that runs the while (1) loop, and restarts
every time. Otherwise, I could potentially just write a wrapper binary, which
execve() the application in a while loop.


Sebastian

>
> Nikolaus





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