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Stefan Kost wrote:
> A second but more complex idea is to use an virtual frame-buffer like:
> /usr/X11R6/bin/Xvfb -ac :9 -screen 9 1024x786x16
>
> And the setting this display as the default one before opening any
> window. Unfortunately this involves
> 1) setting up the virtual display from the test suite
> 1a) either checking if its already up and using it
> 1b) finding a 'free' display number, using it and afterwards teminate it
> 2) redirecting the app there
>
> I have no idea wheter 1a) or 1b) is more practical, both sound tricky.
I'd say 1b is probably easier. You can check two places for a free display:
/tmp/.X11-unix/:
Each new display creates a new socked called "X##" here (where ## is the
display number). So if you just try numbers until one doesn't exist,
you can use that one.
/tmp/.X##-lock:
This is just a lockfile that the X server creates to say "hey, I'm using
this display". Same deal, just find a lockfile that doesn't exist (ok,
that's a bit paradoxical), and use that number.
Of course, there could be a race condition between checking for a file
and starting up the X server, but I'm guessing (hoping) that you're not
planning on starting a bunch of these all at the same time.
-brian
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