error.c

/*
 * lwm, a window manager for X11
 * Copyright (C) 1997-2016 Elliott Hughes, James Carter
 * 
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#include <stdio.h>
#include <stdlib.h>

#include <X11/X.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xproto.h>

#include	"lwm.h"

int ignore_badwindow;

void
panic(char *s) {
	fprintf(stderr, "%s: %s\n", argv0, s);
	exit(EXIT_FAILURE);
}

int
errorHandler(Display *d, XErrorEvent *e) {
	char	msg[80];
	char	req[80];
	char	number[80];

	if (mode == wm_initialising &&
		 e->request_code == X_ChangeWindowAttributes &&
		 e->error_code == BadAccess)
			panic("another window manager is already running.");

	if (ignore_badwindow &&
	    (e->error_code == BadWindow || e->error_code == BadColor))
			return 0;

	XGetErrorText(d, e->error_code, msg, sizeof(msg));
	sprintf(number, "%d", e->request_code);
	XGetErrorDatabaseText(d, "XRequest", number, number, req, sizeof(req));

	fprintf(stderr, "%s: protocol request %s on resource %#x failed: %s\n",
		argv0, req, (unsigned int) e->resourceid, msg);

	if (mode == wm_initialising)
		panic("can't initialise.");

	return 0;
}