<div dir="ltr"><div>Hi Uri: </div>here is the message when we hit the close button: ( I can send screen captures, if you wish ( how ?) ) : XIO: fatal IO error 11 (Resource temporarily unavailable) on X server "cgy530ws:0.0" after 1304786 requests (1300490 known processed) with 0 events remaining. > more tttt.cxx #include <X11/Xlib.h> // Every Xlib program must include this #include <assert.h> // I include this to test return values the lazy way #include <unistd.h> // So we got the profile for 10 seconds #include <stdio.h> #include <stdlib.h> #include <execinfo.h> #define NIL (0) // A name for the void pointer void printBacktrace() { int j, nptrs; #define SIZE 100 void *buffer[100]; char **strings; nptrs = backtrace(buffer, SIZE); printf("backtrace() returned %d addresses\n", nptrs); /* The call backtrace_symbols_fd(buffer, nptrs, STDOUT_FILENO) would produce similar output to the following: */ strings = backtrace_symbols(buffer, nptrs); if (strings == NULL) { perror("backtrace_symbols"); exit(EXIT_FAILURE); } for (j = 0; j < nptrs; j++) printf("%s\n", strings[j]); free(strings); } int myIOXError(Display *disp) { printf("ERROR Received a X IO error on display=%x.\n", disp); printBacktrace(); return True; } main() { Display *dpy = XOpenDisplay(NIL); assert(dpy); int blackColor = BlackPixel(dpy, DefaultScreen(dpy)); int whiteColor = WhitePixel(dpy, DefaultScreen(dpy)); // Create the window Window w = XCreateSimpleWindow(dpy, DefaultRootWindow(dpy), 0, 0, 200, 100, 0, blackColor, blackColor); // We want to get MapNotify events XSelectInput(dpy, w, StructureNotifyMask); // "Map" the window (that is, make it appear on the screen) XMapWindow(dpy, w); // Create a "Graphics Context" GC gc = XCreateGC(dpy, w, 0, NIL); // Tell the GC we draw using the white color XSetForeground(dpy, gc, whiteColor); // register io error handler // XSetIOErrorHandler(myIOXError); // Wait for the MapNotify event for(;;) { XEvent e; XNextEvent(dpy, &e); if (e.type == MapNotify) break; } // Draw the line for(;;) { XDrawLine(dpy, w, gc, 10, 60, 180, 20); // Send the "DrawLine" request to the server XFlush(dpy); } // Wait for 10 seconds sleep(10); } ldd tttt linux-vdso.so.1 => (0x00007f7786ae2000) libX11.so.6 => /usr/lib64/libX11.so.6 (0x0000003ede200000) libstdc++.so.6 => /usr/lib64/libstdc++.so.6 (0x0000003ee1e00000) libm.so.6 => /lib64/libm.so.6 (0x0000003edb600000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x0000003ee1600000) libc.so.6 => /lib64/libc.so.6 (0x0000003edae00000) libxcb.so.1 => /usr/lib64/libxcb.so.1 (0x0000003edda00000) libdl.so.2 => /lib64/libdl.so.2 (0x0000003edba00000) /lib64/ld-linux-x86-64.so.2 (0x0000003edaa00000) libXau.so.6 => /usr/lib64/libXau.so.6 (0x0000003edde00000) </div><div class="gmail_extra"> <div class="gmail_quote">On Tue, May 26, 2015 at 1:54 PM, Uli Schlachter <<a href="mailto:psychon@znc.in" target="_blank">psychon@znc.in</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi, <div><div class="h5"> Am 26.05.2015 um 12:02 schrieb robert somerville: > Hello All: > This is my first post to this group, please forgive any newbie mistakes .. > > We seem to be having this error on our Redhat 6.6 x86-64 system ! Is there > a version of XCB out there that will fix this problem ? This error occurs > also in a third party API and is apparently killing us. It also occurs on a > test drawing program when we close the window ( I believe we found it here, > or nearby) > > Any suggestions how we should go about fixing this ??? > I believe (off the top of my head) that we are running Redhat libxcb-1.9.? </div></div>which error message? Which test drawing program? Any more information than "there is an error message when we close our application"? Cheers, Uli -- <alanc> I think someone had a Xprint version of glxgears at one point, but benchmarking how many GL pages you can print per second was deemed too silly to merge </blockquote></div> </div>