83 lines
2.3 KiB
C
83 lines
2.3 KiB
C
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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
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/*
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* SECTION:restart-helper
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* @short_description: helper program during a restart
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*
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* To smoothly restart Mutter, we want to keep the composite
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* overlay window enabled during the restart. This is done by
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* spawning this program, which keeps a reference to the the composite
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* overlay window until Mutter picks it back up.
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*/
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/*
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* Copyright (C) 2014 Red Hat, Inc.
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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 <stdlib.h>
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#include <stdio.h>
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#include <X11/Xlib.h>
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#include <X11/extensions/Xcomposite.h>
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int
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main (int argc,
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char **argv)
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{
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Display *display = XOpenDisplay (NULL);
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Window selection_window;
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XSetWindowAttributes xwa;
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unsigned long mask = 0;
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xwa.override_redirect = True;
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mask |= CWOverrideRedirect;
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XCompositeGetOverlayWindow (display, DefaultRootWindow (display));
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selection_window = XCreateWindow (display,
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DefaultRootWindow (display),
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-100, -100, 1, 1, 0,
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0,
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InputOnly,
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DefaultVisual (display, DefaultScreen (display)),
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mask, &xwa);
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XSetSelectionOwner (display,
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XInternAtom (display, "_MUTTER_RESTART_HELPER", False),
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selection_window,
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CurrentTime);
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/* Mutter looks for an (arbitrary) line printed to stdout to know that
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* we have started and have a reference to the COW. XSync() so that
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* everything is set on the X server before Mutter starts restarting.
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*/
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XSync (display, False);
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printf ("STARTED\n");
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fflush (stdout);
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while (True)
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{
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XEvent xev;
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XNextEvent (display, &xev);
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/* Mutter restarted and unset the selection to indicate that
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* it has a reference on the COW again */
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if (xev.xany.type == SelectionClear)
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return 0;
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}
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}
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