<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; ">Hey guys, <DIV><BR class="khtml-block-placeholder"></DIV><DIV>I found a problem with running some little apps. </DIV><DIV>I use some very simple apps to check the event stream from the X server. All of them started crashing when I started testing MPX today. The X Server and XCB are both pulled from git (X server last week, XCB today). </DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>There are some weird behaviours: </DIV><DIV>* Using plain Xlib (in Ubunty Breezy) works, linking against XCB makes it crash. </DIV><DIV>* Using PointerMotionMask as well instead of just DeviceMotion will not crash the program, </DIV><DIV>* If I hook up xmond between the server and the client, I can see the input extension events but they never arrive at the client. From what I can tell by debugging the X server before they are sent out, their values are sane.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Here is a very simple program that will crash. </DIV><DIV>=======</DIV><DIV>#include <stdio.h></DIV><DIV>#include <X11/X.h></DIV><DIV>#include <X11/Xlib.h></DIV><DIV>#include <X11/extensions/XInput.h></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>int main (int argc, char** argv)</DIV><DIV>{</DIV><DIV> Display* display;</DIV><DIV> Window win;</DIV><DIV> XDevice* dev;</DIV><DIV> XEventClass class_1;</DIV><DIV> XSetWindowAttributes attr;</DIV><DIV> int screen;</DIV><DIV> int win_width, win_height;</DIV><DIV> int type_1;</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> display = XOpenDisplay(argv[1]);</DIV><DIV> screen = DefaultScreen(display);</DIV><DIV> assert(display != NULL);</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> win_width = 640;</DIV><DIV> win_height = 480;</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> dev = XOpenDevice(display, atoi(argv[2]));</DIV><DIV> assert(dev != NULL);</DIV><DIV> DeviceMotionNotify(dev, type_1, class_1);</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> attr.background_pixel = WhitePixel(display, screen);</DIV><DIV> attr.event_mask = ExposureMask | StructureNotifyMask; //| PointerMotionMask;</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> win = XCreateWindow(display,</DIV><DIV> RootWindow(display, 0),</DIV><DIV> 0, 0,</DIV><DIV> win_width,</DIV><DIV> win_height,</DIV><DIV> 7,</DIV><DIV> DefaultDepth(display, 0),</DIV><DIV> InputOutput,</DIV><DIV> DefaultVisual(display, 0),</DIV><DIV> CWBackPixel | CWEventMask,</DIV><DIV> &attr);</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> XMapWindow(display, win);</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> XSelectExtensionEvent(display, win, &class_1, 1);</DIV><DIV> XSync(display, False);</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> while(1)</DIV><DIV> {</DIV><DIV> XEvent e;</DIV><DIV> XNextEvent(display, &e);</DIV><DIV> XDeviceMotionEvent* mev;</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> switch(e.type)</DIV><DIV> {</DIV><DIV> default:</DIV><DIV> if (e.type == type_1)</DIV><DIV> {</DIV><DIV> printf("Motion notify\n");</DIV><DIV> printf(" state %d\n", mev->state);</DIV><DIV> printf(" devstate %d\n", mev->device_state);</DIV><DIV> } else</DIV><DIV> {</DIV><DIV> printf("Unknown event type %d\n", e.type);</DIV><DIV> }</DIV><DIV> break;</DIV><DIV> }</DIV><DIV> }</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV> XCloseDisplay(display);</DIV><DIV> return 0;</DIV><DIV>}</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>=======</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>(gdb) run roo:1 2</DIV><DIV>Starting program: /home/whot/code/junk/X/XCB_segfault/xcbsegfault roo:1 2</DIV><DIV>Unknown event type 19</DIV><DIV>Unknown event type 12</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Program received signal SIGSEGV, Segmentation fault.</DIV><DIV>0xb7d5985c in memcpy () from /lib/tls/i686/cmov/libc.so.6</DIV><DIV>(gdb) bt</DIV><DIV>#0 0xb7d5985c in memcpy () from /lib/tls/i686/cmov/libc.so.6</DIV><DIV>#1 0xb7e747f2 in XNextEvent (dpy=0xbfc496e4, event=0xbfc496e4) at NextEvent.c:52</DIV><DIV>#2 0x08048895 in main (argc=3, argv=0xbfc49844) at main.c:55</DIV><DIV>(gdb) up 1</DIV><DIV>#1 0xb7e747f2 in XNextEvent (dpy=0xbfc496e4, event=0xbfc496e4) at NextEvent.c:52</DIV><DIV>52 *event = qelt->event;</DIV><DIV>(gdb)</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV><BR><DIV> <SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><DIV>Cheers, </DIV><DIV> Peter</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>--</DIV><DIV>Multi-Pointer X Server</DIV><DIV><A href="http://wearables.unisa.edu.au/mpx">http://wearables.unisa.edu.au/mpx</A></DIV><BR class="Apple-interchange-newline"></SPAN> </DIV><BR></DIV></BODY></HTML>