plot segfaults when X is not available

[Garth Wells]

When running demos remotely without X forwarding, plot commands cause a seg fault. It should be possible to test for an X display or to catch the error if there is no X. This may well be a Viper bug.

[Garth Wells (garth-wells)]

Viper has been retired, marking as won't fix.

[Benjamin Kehlet (benjamik)]

Unfortunately the problem is still there with the new implementation.
I couldn't find any way in VTK to check that an X server is available. Is it possible to use the DISPLAY environment variable? And is it robust? And is it the kind of code you want in Dolfin?

[Anders Logg (logg)]

On Fri, Jul 27, 2012 at 09:40:00AM -0000, Benjamin Kehlet wrote:
> Unfortunately the problem is still there with the new
> implementation. I couldn't find any way in VTK to check that an X
> server is available. Is it possible to use the DISPLAY environment
> variable? And is it robust? And is it the kind of code you want in
> Dolfin?

Checking the DISPLAY variable should be OK I think. At least that's
what Xterm does:

  xterm Xt error: Can't open display:
  xterm: DISPLAY is not set

--
Anders

[Benjamin Kehlet (benjamik)]

Ok, but don't we need to check the the platform as well?

[Joachim Haga (jobh)]

Fixed in trunk. Not allowed to change bug status.