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53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/*
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* Copyright (C) 2022 Alan Jenkins.
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* Copyright (C) 2023 Canonical Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <X11/Xlib.h>
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#include <X11/Xutil.h>
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static int
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has_compositor (Display *dpy,
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int screen)
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{
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char prop_name[20];
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snprintf (prop_name, 20, "_NET_WM_CM_S%d", screen);
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return XGetSelectionOwner (dpy, XInternAtom (dpy, prop_name, False)) != None;
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}
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int
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main (void)
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{
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Display *dpy = XOpenDisplay ("");
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if (has_compositor (dpy, XDefaultScreen (dpy)))
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{
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printf ("X11 Compositor is available for display %s.%d\n",
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DisplayString (dpy), XDefaultScreen (dpy));
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return 0;
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}
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printf ("NO X11 Compositor is available for display %s:%d\n",
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DisplayString (dpy), XDefaultScreen (dpy));
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return 1;
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}
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