static void set_root_cursor();
+static gboolean replace_wm()
+{
+ char *wm_sn;
+ Atom wm_sn_atom;
+ Window current_wm_sn_owner;
+ Time timestamp;
+
+ wm_sn = g_strdup_printf("WM_S%d", ob_screen);
+ wm_sn_atom = XInternAtom(ob_display, wm_sn, FALSE);
+
+ current_wm_sn_owner = XGetSelectionOwner(ob_display, wm_sn_atom);
+ if (current_wm_sn_owner) {
+ if (!ob_replace_wm) {
+ g_message("A window manager is already running on screen %d",
+ ob_screen);
+ return FALSE;
+ }
+ xerror_set_ignore(TRUE);
+ xerror_occured = FALSE;
+
+ /* We want to find out when the current selection owner dies */
+ XSelectInput(ob_display, current_wm_sn_owner, StructureNotifyMask);
+ XSync(ob_display, FALSE);
+
+ xerror_set_ignore(FALSE);
+ if (xerror_occured)
+ current_wm_sn_owner = None;
+ }
+
+ {
+ /* Generate a timestamp */
+ XEvent event;
+
+ XSelectInput(ob_display, screen_support_win, PropertyChangeMask);
+
+ XChangeProperty(ob_display, screen_support_win,
+ prop_atoms.wm_class, prop_atoms.string,
+ 8, PropModeAppend, NULL, 0);
+ XWindowEvent(ob_display, screen_support_win,
+ PropertyChangeMask, &event);
+
+ XSelectInput(ob_display, screen_support_win, NoEventMask);
+
+ timestamp = event.xproperty.time;
+ }
+
+ XSetSelectionOwner(ob_display, wm_sn_atom, screen_support_win,
+ timestamp);
+
+ if (XGetSelectionOwner(ob_display, wm_sn_atom) != screen_support_win) {
+ g_message("Could not acquire window manager selection on screen %d",
+ ob_screen);
+ return FALSE;
+ }
+
+ /* Wait for old window manager to go away */
+ if (current_wm_sn_owner) {
+ XEvent event;
+ gulong wait = 0;
+ const gulong timeout = G_USEC_PER_SEC * 15; /* wait for 15s max */
+
+ while (wait < timeout) {
+ if (XCheckWindowEvent(ob_display, current_wm_sn_owner,
+ StructureNotifyMask, &event) &&
+ event.type == DestroyNotify)
+ break;
+ g_usleep(G_USEC_PER_SEC / 10);
+ wait += G_USEC_PER_SEC / 10;
+ }
+
+ if (wait >= timeout) {
+ g_message("Timeout expired while waiting for the current WM to die "
+ "on screen %d", ob_screen);
+ return FALSE;
+ }
+ }
+
+ /* Send client message indicating that we are now the WM */
+ prop_message(RootWindow(ob_display, ob_screen), prop_atoms.manager,
+ timestamp, wm_sn_atom, 0, 0, SubstructureNotifyMask);
+
+
+ return TRUE;
+}
+
gboolean screen_annex()
{
XSetWindowAttributes attrib;
gint i, num_support;
guint32 *supported;
+ /* create the netwm support window */
+ attrib.override_redirect = TRUE;
+ screen_support_win = XCreateWindow(ob_display,
+ RootWindow(ob_display, ob_screen),
+ -100, -100, 1, 1, 0,
+ CopyFromParent, InputOutput,
+ CopyFromParent,
+ CWOverrideRedirect, &attrib);
+ XMapRaised(ob_display, screen_support_win);
+
+ if (!replace_wm()) {
+ XDestroyWindow(ob_display, screen_support_win);
+ return FALSE;
+ }
+
xerror_set_ignore(TRUE);
xerror_occured = FALSE;
XSelectInput(ob_display, RootWindow(ob_display, ob_screen),
if (xerror_occured) {
g_message("A window manager is already running on screen %d",
ob_screen);
+
+ XDestroyWindow(ob_display, screen_support_win);
return FALSE;
}
PROP_SET32(RootWindow(ob_display, ob_screen),
openbox_pid, cardinal, pid);
- /* create the netwm support window */
- attrib.override_redirect = TRUE;
- screen_support_win = XCreateWindow(ob_display,
- RootWindow(ob_display, ob_screen),
- -100, -100, 1, 1, 0,
- CopyFromParent, InputOutput,
- CopyFromParent,
- CWOverrideRedirect, &attrib);
- XMapRaised(ob_display, screen_support_win);
-
/* set supporting window */
PROP_SET32(RootWindow(ob_display, ob_screen),
net_supporting_wm_check, window, screen_support_win);