Re: How to reconnect to a new X Server

[Ivan Vučica]

Several years ago I worked a bit on a simple login panel which didn't use X11 directly; instead I tried to structure it in a modular fashion. The only useful module that I implemented used SDL to open a window. It's unfinished, but seems to work for basic login. My goal was to, eventually, draw a beautiful scene using OpenGL (which today may be easier than ever: see http://shadertoy.com/) to use for login.

It was inspired by SLiM, which was inspired by loginpanel.app (we're going in circles here, aren't we!).

It was written before I discovered the beauty of Objective-C, so it's written in C++.

  http://sourceforge.net/projects/gldm/

I don't claim it's a beauty (in fact, I haven't looked at the code in quite a long time, and it's almost certainly a big mess) nor that it is easy to understand, but 'gldm.cpp' may be of interest.

On Mon Dec 16 2013 at 2:54:37 PM, Moon Elf <moonelf@moonelfsystem.net> wrote:

> On 2013-05-22, Sebastian Reitenbach <sebastia@l00-bugdead-prods.de> wrote:
> > 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?
> >
> > cheers,
> > Sebastian
> >
> >
> I think you better use the C interface to X, I've written a small self-managed
> window app which displays on an X server, the code is here :
> http://sf.net/projects/jackassbotchx/
>
> You can also try to read the Xlib programming manual.
>
> Then, when using while (1) { /**/ } try to use an interrupt such as an XEvent
> (see my tarballed code above) or custom items.
>
> ME
>
> --
> Member of the DR rogue circle.
> Search and you will find.
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