[XFree86] BadAccess errors using XShmPutImage

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i'm attempting to put together a simple test that creates a window, allocates a buffer in
memory and using an XImage and XShmPutImage () displays it on my screen.

i have a tiny piece of code that (as far as i know) does all the right things - it creates the
window but when i try to display the contents of my buffer via an XImage i get a message like
this:

X Error of failed request:  BadAccess (attempt to access private resource denied)
  Major opcode of failed request:  144 (MIT-SHM)
  Minor opcode of failed request:  3 (X_ShmPutImage)

i've seen this type of problem described in the newsgroups but there don't seem to be any
answers posted.

i check the return from all my previous calls and they're fine.

i'm using XFree86 version 4.3.0 (27 feb 2003), X Protocol version 11, rev 0, rel 6.6 and my OS
is NetBSD/i386 1.6 [elf].

can anyone shed any light on this please?

thanks.

cp
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