text: /*
   * The Qubes OS Project, http://www.qubes-os.org
   *
   * Copyright (C) 2010  Rafal Wojtczuk  <rafal@invisiblethingslab.com>
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
   *
   */
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include  <X11/Xlib.h>
  #include <X11/Xlibint.h>
  int dummy_handler(Display * dpy, XErrorEvent * ev)
  {
  #define ERROR_BUF_SIZE 256
      char buf[ERROR_BUF_SIZE];
      char request[ERROR_BUF_SIZE];
      _XExtension *ext = NULL;
  
      XGetErrorText(dpy, ev->error_code, buf, sizeof(buf));
      fprintf(stderr, "ErrorHandler: %s\n", buf);
  
      /* Find major opcode name */
      if (ev->request_code < 128) {
          snprintf(request, sizeof(request), "%d", ev->request_code);
          XGetErrorDatabaseText(dpy, "XRequest", request, "", buf,
                        sizeof(buf));
      } else {
          for (ext = dpy->ext_procs;
               ext && ext->codes.major_opcode != ev->request_code;
               ext = ext->next);
          if (ext) {
              strncpy(buf, ext->name, sizeof(buf) - 1);
              buf[sizeof(buf) - 1] = '\0';
          } else {
              buf[0] = '\0';
          }
      }
      fprintf(stderr, "                 Major opcode: %d (%s)\n",
          ev->request_code, buf);
  
      /* Find minor opcode name */
      if (ev->request_code >= 128 && ext) {
          snprintf(request, sizeof(request), "%d", ev->request_code);
          snprintf(request, sizeof(request), "%s.%d",
               ext->name, ev->minor_code);
          XGetErrorDatabaseText(dpy, "XRequest", request, "", buf,
                        sizeof(buf));
          fprintf(stderr, "                 Minor opcode: %d (%s)\n",
              ev->minor_code, buf);
      }
  
      /* Provide value information */
      switch (ev->error_code) {
      case BadValue:
          fprintf(stderr, "                 Value:        0x%x\n",
              (int) ev->resourceid);
          break;
      case BadAtom:
          fprintf(stderr, "                 AtomID:       0x%x\n",
              (int) ev->resourceid);
          break;
      default:
          fprintf(stderr, "                 ResourceID:   0x%x\n",
              (int) ev->resourceid);
          break;
      }
  
      /* Provide serial number information */
      fprintf(stderr, "                 Failed serial number:  %ld\n",
          ev->serial);
      fprintf(stderr, "                 Current serial number: %ld\n",
          dpy->request);
      return 0;
  }
  