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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* Copyright (C) 2022 Alan Jenkins.
* Copyright (C) 2023 Canonical Ltd.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
static int
has_compositor (Display *dpy,
int screen)
{
char prop_name[20];
snprintf (prop_name, 20, "_NET_WM_CM_S%d", screen);
return XGetSelectionOwner (dpy, XInternAtom (dpy, prop_name, False)) != None;
}
int
main (void)
{
Display *dpy = XOpenDisplay ("");
if (has_compositor (dpy, XDefaultScreen (dpy)))
{
printf ("X11 Compositor is available for display %s.%d\n",
DisplayString (dpy), XDefaultScreen (dpy));
return 0;
}
printf ("NO X11 Compositor is available for display %s:%d\n",
DisplayString (dpy), XDefaultScreen (dpy));
return 1;
}
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