[Rd] X11 help please
murdoch at stats.uwo.ca
Tue Jun 19 04:08:21 CEST 2007
Duncan Murdoch wrote:
> The rgl package currently crashes R when running under Xvfb (the
> "virtual frame buffer" server), at least on MacOSX. It makes sense that
> it shouldn't be able to work there (it needs interactivity), but I don't
> know how to detect the problems before they cause the crash.
> Currently the error happens the first time you try to open an rgl
> window; when rgl calls XCreateWindow R crashes with the error message
> X Error of failed request: BadMatch (invalid parameter attributes)
> Major opcode of failed request: 1 (X_CreateWindow)
> Serial number of failed request: 28
> Current serial number in output stream: 29
> I've checked and as far as I can see all the parameters we're sending to
> XCreateWindow are valid, but I might have missed something: I don't
> know much about X11 programming. (The call is
> ::Window xwindow = XCreateWindow(
> xdisplay, RootWindow(xdisplay, DefaultScreen(xdisplay)),
> 0, 0, 256, 256, 0,
> but without context that's probably not worth much to others.)
> Are there any experienced X11 programmers out there who can suggest what
> to do next?
I have now committed some changes to rgl to avoid the crash -- it
converts the above error into an R error.
I think to actually fix it, I'd need to debug the MacOSX Xvfb code to
see exactly what it's complaining about. I don't know where to find
that source, so this isn't likely to happen soon.
Are there any X11/MacOSX programmers going to the UseR! meeting in
August? I'd guess if I could sit down with someone who had experience
with both of those we could track this down fairly quickly, but I don't
think I'll be able to do it without that.
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