1 /* -*- mode:c; c-basic-offset: 8; indent-tabs-mode: nil; -*- */
2 /* Tool to set the property _CINNAMON_SESSION_ACCELERATED on the root window */
3 /*
4 * Copyright (C) 2011 Red Hat, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
19 *
20 * Author:
21 * Colin Walters <walters@verbum.org>
22 */
23
24 #include "config.h"
25
26 #include <string.h>
27 #include <unistd.h>
28 #include <stdlib.h>
29
30 #include <gtk/gtk.h>
31 #include <gdk/gdkx.h>
32 #include <X11/Xatom.h>
33
34 /* Wait up to this long for a running check to finish */
35 #define PROPERTY_CHANGE_TIMEOUT 5000
36
37 /* Values used for the _CINNAMON_SESSION_ACCELERATED root window property */
38 #define NO_ACCEL 0
39 #define HAVE_ACCEL 1
40 #define ACCEL_CHECK_RUNNING 2
41
42 static Atom is_accelerated_atom;
43 static gboolean property_changed;
44
45 static void
46 exit_1_message (const char *msg) G_GNUC_NORETURN;
47
48 static void
exit_1_message(const char * msg)49 exit_1_message (const char *msg)
50 {
51 g_printerr ("%s", msg);
52 exit (1);
53 }
54
55 static gboolean
on_property_notify_timeout(gpointer data)56 on_property_notify_timeout (gpointer data)
57 {
58 gtk_main_quit ();
59 return FALSE;
60 }
61
62 static GdkFilterReturn
property_notify_filter(GdkXEvent * xevent,GdkEvent * event,gpointer data)63 property_notify_filter (GdkXEvent *xevent,
64 GdkEvent *event,
65 gpointer data)
66 {
67 XPropertyEvent *ev = xevent;
68
69 if (ev->type == PropertyNotify && ev->atom == is_accelerated_atom) {
70 property_changed = TRUE;
71 gtk_main_quit ();
72 }
73
74 return GDK_FILTER_CONTINUE;
75 }
76
77 static gboolean
wait_for_property_notify(void)78 wait_for_property_notify (void)
79 {
80 GdkDisplay *display = NULL;
81 GdkScreen *screen;
82 GdkWindow *root;
83 Window rootwin;
84
85 property_changed = FALSE;
86
87 display = gdk_display_get_default ();
88 screen = gdk_display_get_default_screen (display);
89 root = gdk_screen_get_root_window (screen);
90 rootwin = gdk_x11_window_get_xid (root);
91
92 XSelectInput (GDK_DISPLAY_XDISPLAY (display), rootwin, PropertyChangeMask);
93 gdk_window_add_filter (root, property_notify_filter, NULL);
94 g_timeout_add (PROPERTY_CHANGE_TIMEOUT, on_property_notify_timeout, NULL);
95
96 gtk_main ();
97
98 return property_changed;
99 }
100
101 int
main(int argc,char ** argv)102 main (int argc, char **argv)
103 {
104 GdkDisplay *display = NULL;
105 int estatus;
106 char *child_argv[] = { LIBEXECDIR "/cinnamon-session-check-accelerated-helper", NULL };
107 Window rootwin;
108 glong is_accelerated;
109 GError *error = NULL;
110
111 gtk_init (NULL, NULL);
112
113 display = gdk_display_get_default ();
114 rootwin = gdk_x11_get_default_root_xwindow ();
115
116 is_accelerated_atom = gdk_x11_get_xatom_by_name_for_display (display, "_CINNAMON_SESSION_ACCELERATED");
117
118 {
119 Atom type;
120 gint format;
121 gulong nitems;
122 gulong bytes_after;
123 guchar *data;
124
125 read:
126 gdk_x11_display_error_trap_push (display);
127 XGetWindowProperty (GDK_DISPLAY_XDISPLAY (display), rootwin,
128 is_accelerated_atom,
129 0, G_MAXLONG, False, XA_CARDINAL, &type, &format, &nitems,
130 &bytes_after, &data);
131 gdk_x11_display_error_trap_pop_ignored (display);
132
133 if (type == XA_CARDINAL) {
134 glong *is_accelerated_ptr = (glong*) data;
135
136 if (*is_accelerated_ptr == ACCEL_CHECK_RUNNING) {
137 /* Test in progress, wait */
138 if (wait_for_property_notify ())
139 goto read;
140 /* else fall through and do the check ourselves */
141
142 } else {
143 return (*is_accelerated_ptr == 0 ? 1 : 0);
144 }
145 }
146 }
147
148 /* We don't have the property or it's the wrong type.
149 * Try to compute it now.
150 */
151
152 /* First indicate that a test is in progress */
153 is_accelerated = ACCEL_CHECK_RUNNING;
154 XChangeProperty (GDK_DISPLAY_XDISPLAY (display),
155 rootwin,
156 is_accelerated_atom,
157 XA_CARDINAL, 32, PropModeReplace, (guchar *) &is_accelerated, 1);
158
159 gdk_display_sync (display);
160
161 estatus = 1;
162 if (!g_spawn_sync (NULL, (char**)child_argv, NULL, 0,
163 NULL, NULL, NULL, NULL, &estatus, &error)) {
164 is_accelerated = FALSE;
165 g_printerr ("cinnamon-session-check-accelerated: Failed to run helper: %s\n", error->message);
166 g_clear_error (&error);
167 } else {
168 is_accelerated = (estatus == 0);
169 if (!is_accelerated)
170 g_printerr ("cinnamon-session-check-accelerated: Helper exited with code %d\n", estatus);
171 }
172
173 XChangeProperty (GDK_DISPLAY_XDISPLAY (display),
174 rootwin,
175 is_accelerated_atom,
176 XA_CARDINAL, 32, PropModeReplace, (guchar *) &is_accelerated, 1);
177
178 gdk_display_sync (display);
179
180 return is_accelerated ? 0 : 1;
181 }
182