[mutter] udev: Add device-removed signal

[Jonas Ådahl <jadahl src gnome org>]

commit 6792903c4f492c31cfcd8b9f0dd6ca0d7c8bef1d
Author: Hans de Goede <hdegoede redhat com>
Date:   Fri Aug 2 22:41:00 2019 +0200

    udev: Add device-removed signal
    
    Add a device-removed signal which gets emitted when a GPU is removed.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/713

 src/backends/native/meta-udev.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
---
diff --git a/src/backends/native/meta-udev.c b/src/backends/native/meta-udev.c
index 719466131..7c8080a56 100644
--- a/src/backends/native/meta-udev.c
+++ b/src/backends/native/meta-udev.c
@@ -31,6 +31,7 @@ enum
 {
   HOTPLUG,
   DEVICE_ADDED,
+  DEVICE_REMOVED,
 
   N_SIGNALS
 };
@@ -163,6 +164,8 @@ on_uevent (GUdevClient *client,
 
   if (g_str_equal (action, "add"))
     g_signal_emit (udev, signals[DEVICE_ADDED], 0, device);
+  else if (g_str_equal (action, "remove"))
+    g_signal_emit (udev, signals[DEVICE_REMOVED], 0, device);
 
   if (g_udev_device_get_property_as_boolean (device, "HOTPLUG"))
     g_signal_emit (udev, signals[HOTPLUG], 0);
@@ -221,4 +224,11 @@ meta_udev_class_init (MetaUdevClass *klass)
                   0, NULL, NULL, NULL,
                   G_TYPE_NONE, 1,
                   G_UDEV_TYPE_DEVICE);
+  signals[DEVICE_REMOVED] =
+    g_signal_new ("device-removed",
+                  G_TYPE_FROM_CLASS (object_class),
+                  G_SIGNAL_RUN_LAST,
+                  0, NULL, NULL, NULL,
+                  G_TYPE_NONE, 1,
+                  G_UDEV_TYPE_DEVICE);
 }