compositor: Add kill signal

For now it's being emitted only on the desktop shell kill binding.

Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>

src/compositor.c

@@ -2737,6 +2737,7 @@ weston_compositor_init(struct weston_compositor *ec,
 	ec->wl_display = display;
 	wl_signal_init(&ec->destroy_signal);
 	wl_signal_init(&ec->activate_signal);
+	wl_signal_init(&ec->kill_signal);
 	wl_signal_init(&ec->lock_signal);
 	wl_signal_init(&ec->unlock_signal);
 	wl_signal_init(&ec->show_input_panel_signal);

src/compositor.h

@@ -294,6 +294,7 @@ struct weston_compositor {
 	struct weston_shell_interface shell_interface;
 
 	struct wl_signal activate_signal;
+	struct wl_signal kill_signal;
 	struct wl_signal lock_signal;
 	struct wl_signal unlock_signal;
 

src/shell.c

@@ -3505,12 +3505,16 @@ force_kill_binding(struct wl_seat *seat, uint32_t time, uint32_t key,
 {
 	struct wl_surface *focus_surface;
 	struct wl_client *client;
+	struct desktop_shell *shell = data;
+	struct weston_compositor *compositor = shell->compositor;
 	pid_t pid;
 
 	focus_surface = seat->keyboard->focus;
 	if (!focus_surface)
 		return;
 
+	wl_signal_emit(&compositor->kill_signal, focus_surface);
+
 	client = focus_surface->resource.client;
 	wl_client_get_credentials(client, &pid, NULL, NULL);