[gdm] xdmcp-display-factory: notify remote display when session ended

[Ray Strode <halfline src gnome org>]

commit 6ae733e46b189c1f47b04001d19479d0e06282dc
Author: Ray Strode <rstrode redhat com>
Date:   Tue Jul 19 16:54:43 2016 -0400

    xdmcp-display-factory: notify remote display when session ended
    
    gnome-shell and the session dbus daemon don't automatically exit
    when gnome-session does.  They, instead, wait for the display to
    exit or regenerate. If the display is remote, that won't happen
    until the keep alive timeout.
    
    This commit changes GDM to explicitly notify the remote display
    when the session is over, so that it can regenerate immediately.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=776059

 daemon/gdm-xdmcp-display-factory.c |   15 ++++++++++++++-
 1 files changed, 14 insertions(+), 1 deletions(-)
---
diff --git a/daemon/gdm-xdmcp-display-factory.c b/daemon/gdm-xdmcp-display-factory.c
index 328ec37..b9ab921 100644
--- a/daemon/gdm-xdmcp-display-factory.c
+++ b/daemon/gdm-xdmcp-display-factory.c
@@ -210,7 +210,10 @@ enum {
 static void     gdm_xdmcp_display_factory_class_init    (GdmXdmcpDisplayFactoryClass *klass);
 static void     gdm_xdmcp_display_factory_init          (GdmXdmcpDisplayFactory      *manager);
 static void     gdm_xdmcp_display_factory_finalize      (GObject                     *object);
-
+static void     gdm_xdmcp_send_alive (GdmXdmcpDisplayFactory *factory,
+                                      GdmAddress             *address,
+                                      CARD16                  dspnum,
+                                      CARD32                  sessid);
 static gpointer xdmcp_display_factory_object = NULL;
 
 G_DEFINE_TYPE (GdmXdmcpDisplayFactory, gdm_xdmcp_display_factory, GDM_TYPE_DISPLAY_FACTORY)
@@ -2065,6 +2068,9 @@ on_display_status_changed (GdmDisplay             *display,
         GdmDisplayStore *store;
         GdmLaunchEnvironment *launch_environment;
         GdmSession *session;
+        GdmAddress *address;
+        gint32  session_number;
+        int display_number;
 
         store = gdm_display_factory_get_display_store (GDM_DISPLAY_FACTORY (factory));
 
@@ -2081,6 +2087,13 @@ on_display_status_changed (GdmDisplay             *display,
         g_debug ("GdmXdmcpDisplayFactory: xdmcp display status changed: %d", status);
         switch (status) {
         case GDM_DISPLAY_FINISHED:
+                g_object_get (display,
+                              "remote-address", &address,
+                              "x11-display-number", &display_number,
+                              "session-number", &session_number,
+                              NULL);
+                gdm_xdmcp_send_alive (factory, address, display_number, session_number);
+
                 gdm_display_store_remove (store, display);
                 break;
         case GDM_DISPLAY_FAILED: