> 1) Does your X-server have SHM support? "MIT-SHM" should show up in > the list of extensions reported by xdpyinfo. Yep - that extension is listed when i run xdpyinfo. > 2) Does your operating system have SHM support? This sort of thing > is often disabled for security reasons. i'm not sure how to test this - i'm very much a x/unix novice - but after adding printf's to another library i've been looking at (SDL), it seems that it is - SDL is certainly calling XShmPutImage () successfully. > 3) Programming errors on your part? BadAccess is generated if: Very likely. > a) the server doesn't know about the segment (you called > XShmAttach on it didn't you?). Yep - I do that. > b) The size is bad, that is, the segment is too small to > contain the source you specified (or the XImage is > improperly initialized). I suspect that it is some kind of unitialized structure problem. I chopped the return value tests and the error handler out of my code for clarity and tacked it on the end of this message - might be something obvious. Thanks. cp -------- snip -------- shmInfo.shmid = shmget ( IPC_PRIVATE, windowWidth * windowDepthBytes * windowHeight, IPC_CREAT | 0777 ); shmInfo.shmaddr = (char *)shmat ( shmInfo.shmid, 0, 0); shminfo.readOnly = False; XShmAttach ( display, &shmInfo ); XSync ( display, True ); shmctl ( shmInfo.shmid, IPC_RMID, NULL ); pixels = shmInfo.shmaddr; ximage = XShmCreateImage ( display, DefaultVisual ( display, screen ), windowDepth, ZPixmap, shmInfo.shmaddr, &shmInfo, windowWidth, windowHeight ); XShmPutImage ( display, window, DefaultGC ( display, screen ), ximage, 0, 0, 0, 0, windowWidth, windowHeight, False ); ---------------------- > > 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]. _______________________________________________ XFree86 mailing list XFree86@xxxxxxxxxxx http://XFree86.Org/mailman/listinfo/xfree86
