Re: Debugging Xvfb

Duncan Murdoch <murdoch@xxxxxxxxxxxx> · Sun, 14 Oct 2007 12:26:26 -0400

On 27/09/2007 10:03 AM, Marc Aurele La France wrote:

On Thu, 27 Sep 2007, Duncan Murdoch wrote:

Marc Aurele La France wrote:

On Tue, 25 Sep 2007, Duncan Murdoch wrote:

I am writing some code using OpenGL, and when run under Xvfb on MacOS it 

dies, 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:  17
   Current serial number in output stream:  19

There are a number of different reasons for which XCreateWindow() would 

return BadMatch.  Check the man page.

I have rebuilt X from XFree86 version 4.7.0 and the error has gone away. 

Originally the last line of man Xvfb was

X Version 11                      Release 6.6 

XVFB(1)

but now it says

XFree86                          Version 4.7.0 

XVFB(1)

So this looks like it's probably a bug in the Xvfb that Apple distributes, 

and the bug isn't present in XFree86 4.7.0.  Still, if I could I'd like to 

try to work around the bug:  any idea where I'd find the source for

the original Xvfb, so I could try to determine what it's complaining about?

Quite a bit of Apple's sources can be found at ...

 	http://www.opensource.apple.com/darwinsource

A followup on this, in case it ever bites anyone else.

Source that behaves like the OSX 10.4 release of X11 is at

http://www.opensource.apple.com/darwinsource/tarballs/other/X11-0.46.4.tar.gz

(I'm not completely sure that's exactly what is on the CD, but it was 

close enough to solve my problem.)

And the solution to my problem was to specify CWBorderPixel when I 

called XCreateWindow. Without that my call failed in the CreateWindow 

function in xc/programs/Xserver/dix/window.c.

I don't know why no other X server cares about this.

Duncan Murdoch
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