xcb errors are not handled at Xlib, gives fatal IO error 11 (Resource temporarily unavailable)

Submitted by Arvind Umrao

Assigned to Arvind Umrao

Link to original bug (#54109)

Description

xcb errors are not handled at Xlib. It gives

XIO: fatal IO error 11 (Resource temporarily unavailable) on X server ":0.0" after 14 requests (13 known processed) with 0 events remaining.

Step to reproduce the problem Compile following code with cc test.c -lX11 then run ./a.out

close it with Ctrl-C

 #include <X11/Xlib.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

 int main(void) {
   Display *d;
   Window w;
   XEvent e;
   char *msg = "Hello, World!";
   int s;

   d = XOpenDisplay(NULL);
   if (d == NULL) {
     fprintf(stderr, "Cannot open display\n");
     exit(1);
   }

   s = DefaultScreen(d);

   w = XCreateSimpleWindow(d, RootWindow(d, s), 10, 10, 200, 200, 1,
                           BlackPixel(d, s), WhitePixel(d, s));

   /* select kind of events we are interested in */
   XSelectInput(d, w, ExposureMask | KeyPressMask);

   XMapWindow(d, w);

   while (1) {
     XNextEvent(d, &e);
     /* draw or redraw the window */
     if (e.type == Expose) {
       XFillRectangle(d, w, DefaultGC(d, s), 20, 20, 10, 10);
       XDrawString(d, w, DefaultGC(d, s), 50, 50, msg, strlen(msg));
     }
     /* exit on key press */
     if (e.type == KeyPress)
       break;
   }

   XCloseDisplay(d);

   return 0;
 }