error.c

/*
 * 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);
    }  else {
        fprintf(stderr, "                 Minor opcode: %d\n",
            ev->minor_code);
    }

    /* 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;
}