[mutter] monitor-manager-kms: Put uevent signal management in helpers

[Jonas Ådahl <jadahl src gnome org>]

commit 73b2b30a1db807331c4ac546664f5e4ba6cb4511
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Mar 10 15:11:56 2017 +0800

    monitor-manager-kms: Put uevent signal management in helpers
    
    https://bugzilla.gnome.org/show_bug.cgi?id=779837

 src/backends/native/meta-monitor-manager-kms.c |   21 +++++++++++++++++++--
 1 files changed, 19 insertions(+), 2 deletions(-)
---
diff --git a/src/backends/native/meta-monitor-manager-kms.c b/src/backends/native/meta-monitor-manager-kms.c
index 1d9bdfd..bad4fb6 100644
--- a/src/backends/native/meta-monitor-manager-kms.c
+++ b/src/backends/native/meta-monitor-manager-kms.c
@@ -112,6 +112,7 @@ struct _MetaMonitorManagerKms
   unsigned int       n_connectors;
 
   GUdevClient *udev;
+  guint uevent_handler_id;
 
   GSettings *desktop_settings;
 
@@ -1765,6 +1766,23 @@ static GSourceFuncs kms_event_funcs = {
 };
 
 static void
+meta_monitor_manager_kms_connect_uevent_handler (MetaMonitorManagerKms *manager_kms)
+{
+  manager_kms->uevent_handler_id = g_signal_connect (manager_kms->udev,
+                                                     "uevent",
+                                                     G_CALLBACK (on_uevent),
+                                                     manager_kms);
+}
+
+static void
+meta_monitor_manager_kms_disconnect_uevent_handler (MetaMonitorManagerKms *manager_kms)
+{
+  g_signal_handler_disconnect (manager_kms->udev,
+                               manager_kms->uevent_handler_id);
+  manager_kms->uevent_handler_id = 0;
+}
+
+static void
 meta_monitor_manager_kms_init (MetaMonitorManagerKms *manager_kms)
 {
   MetaBackend *backend = meta_get_backend ();
@@ -1778,8 +1796,7 @@ meta_monitor_manager_kms_init (MetaMonitorManagerKms *manager_kms)
 
   const char *subsystems[2] = { "drm", NULL };
   manager_kms->udev = g_udev_client_new (subsystems);
-  g_signal_connect (manager_kms->udev, "uevent",
-                    G_CALLBACK (on_uevent), manager_kms);
+  meta_monitor_manager_kms_connect_uevent_handler (manager_kms);
 
   source = g_source_new (&kms_event_funcs, sizeof (MetaKmsSource));
   manager_kms->source = (MetaKmsSource *) source;