From 5b156c4392d6d511f82b308d40e7238a4df45f5b Mon Sep 17 00:00:00 2001
From: Benjamin Franzke <benjaminfranzke@googlemail.com>
Date: Fri, 7 Oct 2011 14:34:31 +0200
Subject: server: Add destroy listener for input focus resources

To avoid sending updates to already destroyed resources.
Fixes segfault in compositor when closing the terminal.
---
 src/wayland-server.c | 38 ++++++++++++++++++++++++++++++++++++--
 src/wayland-server.h |  2 ++
 2 files changed, 38 insertions(+), 2 deletions(-)

diff --git a/src/wayland-server.c b/src/wayland-server.c
index 4ee7796..2e948ed 100644
--- a/src/wayland-server.c
+++ b/src/wayland-server.c
@@ -356,6 +356,28 @@ lose_keyboard_focus(struct wl_listener *listener,
 	wl_input_device_set_keyboard_focus(device, NULL, time);
 }
 
+static void
+pointer_focus_resource_destroyed(struct wl_listener *listener,
+				 struct wl_resource *resource, uint32_t time)
+{
+	struct wl_input_device *device =
+		container_of(listener, struct wl_input_device,
+			     pointer_focus_resource_listener);
+
+	device->pointer_focus_resource = NULL;
+}
+
+static void
+keyboard_focus_resource_destroyed(struct wl_listener *listener,
+				  struct wl_resource *resource, uint32_t time)
+{
+	struct wl_input_device *device =
+		container_of(listener, struct wl_input_device,
+			     keyboard_focus_resource_listener);
+
+	device->keyboard_focus_resource = NULL;
+}
+
 WL_EXPORT void
 wl_input_device_init(struct wl_input_device *device,
 		     struct wl_compositor *compositor)
@@ -363,7 +385,11 @@ wl_input_device_init(struct wl_input_device *device,
 	memset(device, 0, sizeof *device);
 	wl_list_init(&device->resource_list);
 	device->pointer_focus_listener.func = lose_pointer_focus;
+	device->pointer_focus_resource_listener.func =
+		pointer_focus_resource_destroyed;
 	device->keyboard_focus_listener.func = lose_keyboard_focus;
+	device->keyboard_focus_resource_listener.func =
+		keyboard_focus_resource_destroyed;
 
 	device->x = 100;
 	device->y = 100;
@@ -404,8 +430,10 @@ wl_input_device_set_pointer_focus(struct wl_input_device *device,
 		wl_resource_post_event(device->pointer_focus_resource,
 				       WL_INPUT_DEVICE_POINTER_FOCUS,
 				       time, NULL, 0, 0, 0, 0);
-	if (device->pointer_focus_resource)
+	if (device->pointer_focus)
 		wl_list_remove(&device->pointer_focus_listener.link);
+	if (device->pointer_focus_resource)
+		wl_list_remove(&device->pointer_focus_resource_listener.link);
 
 	resource = find_resource_for_surface(&device->resource_list, surface);
 	if (resource) {
@@ -414,6 +442,8 @@ wl_input_device_set_pointer_focus(struct wl_input_device *device,
 				       time, surface, x, y, sx, sy);
 		wl_list_insert(surface->resource.destroy_listener_list.prev,
 			       &device->pointer_focus_listener.link);
+		wl_list_insert(resource->destroy_listener_list.prev,
+			       &device->pointer_focus_resource_listener.link);
 	}
 
 	device->pointer_focus_resource = resource;
@@ -437,8 +467,10 @@ wl_input_device_set_keyboard_focus(struct wl_input_device *device,
 		wl_resource_post_event(device->keyboard_focus_resource,
 				       WL_INPUT_DEVICE_KEYBOARD_FOCUS,
 				       time, NULL, &device->keys);
-	if (device->keyboard_focus_resource)
+	if (device->keyboard_focus)
 		wl_list_remove(&device->keyboard_focus_listener.link);
+	if (device->keyboard_focus_resource)
+		wl_list_remove(&device->keyboard_focus_resource_listener.link);
 
 	resource = find_resource_for_surface(&device->resource_list, surface);
 	if (resource) {
@@ -447,6 +479,8 @@ wl_input_device_set_keyboard_focus(struct wl_input_device *device,
 				       time, surface, &device->keys);
 		wl_list_insert(surface->resource.destroy_listener_list.prev,
 			       &device->keyboard_focus_listener.link);
+		wl_list_insert(resource->destroy_listener_list.prev,
+			       &device->keyboard_focus_resource_listener.link);
 	}
 
 	device->keyboard_focus_resource = resource;
diff --git a/src/wayland-server.h b/src/wayland-server.h
index 9f5e8c3..6e7a347 100644
--- a/src/wayland-server.h
+++ b/src/wayland-server.h
@@ -171,6 +171,8 @@ struct wl_input_device {
 	uint32_t keyboard_focus_time;
 	struct wl_listener pointer_focus_listener;
 	struct wl_listener keyboard_focus_listener;
+	struct wl_listener pointer_focus_resource_listener;
+	struct wl_listener keyboard_focus_resource_listener;
 
 	int32_t x, y;
 	struct wl_grab *grab;
-- 
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