1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
/*
* restart-helper
*
* Helper program during a restart
*
* To smoothly restart Mutter, we want to keep the composite
* overlay window enabled during the restart. This is done by
* spawning this program, which keeps a reference to the the composite
* overlay window until Mutter picks it back up.
*/
/*
* Copyright (C) 2014 Red Hat, Inc.
*
* 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 <stdlib.h>
#include <stdio.h>
#include <X11/Xlib.h>
#include <X11/extensions/Xcomposite.h>
int
main (int argc,
char **argv)
{
Display *display = XOpenDisplay (NULL);
Window selection_window;
XSetWindowAttributes xwa;
unsigned long mask = 0;
xwa.override_redirect = True;
mask |= CWOverrideRedirect;
XCompositeGetOverlayWindow (display, DefaultRootWindow (display));
selection_window = XCreateWindow (display,
DefaultRootWindow (display),
-100, -100, 1, 1, 0,
0,
InputOnly,
DefaultVisual (display, DefaultScreen (display)),
mask, &xwa);
XSetSelectionOwner (display,
XInternAtom (display, "_MUTTER_RESTART_HELPER", False),
selection_window,
CurrentTime);
/* Mutter looks for an (arbitrary) line printed to stdout to know that
* we have started and have a reference to the COW. XSync() so that
* everything is set on the X server before Mutter starts restarting.
*/
XSync (display, False);
printf ("STARTED\n");
fflush (stdout);
while (True)
{
XEvent xev;
XNextEvent (display, &xev);
/* Mutter restarted and unset the selection to indicate that
* it has a reference on the COW again */
if (xev.xany.type == SelectionClear)
return 0;
}
}
|
