backend/wayland: handle wl_registry.global_remove for wl_seat

Destroy the struct wlr_wl_seat when the global is removed.

backend/wayland/backend.c

@@ -354,7 +354,7 @@ static void registry_global(void *data, struct wl_registry *registry,
 		}
 		struct wl_seat *wl_seat = wl_registry_bind(registry, name,
 			&wl_seat_interface, target_version);
-		if (!create_wl_seat(wl_seat, wl)) {
+		if (!create_wl_seat(wl_seat, wl, name)) {
 			wl_seat_destroy(wl_seat);
 		}
 	} else if (strcmp(iface, xdg_wm_base_interface.name) == 0) {
@@ -398,7 +398,15 @@ static void registry_global(void *data, struct wl_registry *registry,
 
 static void registry_global_remove(void *data, struct wl_registry *registry,
 		uint32_t name) {
-	// TODO
+	struct wlr_wl_backend *wl = data;
+
+	struct wlr_wl_seat *seat;
+	wl_list_for_each(seat, &wl->seats, link) {
+		if (seat->global_name == name) {
+			destroy_wl_seat(seat);
+			break;
+		}
+	}
 }
 
 static const struct wl_registry_listener registry_listener = {

backend/wayland/seat.c

@@ -233,7 +233,8 @@ void init_seat_touch(struct wlr_wl_seat *seat) {
 
 static const struct wl_seat_listener seat_listener;
 
-bool create_wl_seat(struct wl_seat *wl_seat, struct wlr_wl_backend *wl) {
+bool create_wl_seat(struct wl_seat *wl_seat, struct wlr_wl_backend *wl,
+		uint32_t global_name) {
 	struct wlr_wl_seat *seat = calloc(1, sizeof(struct wlr_wl_seat));
 	if (!seat) {
 		wlr_log_errno(WLR_ERROR, "Allocation failed");
@@ -241,6 +242,7 @@ bool create_wl_seat(struct wl_seat *wl_seat, struct wlr_wl_backend *wl) {
 	}
 	seat->wl_seat = wl_seat;
 	seat->backend = wl;
+	seat->global_name = global_name;
 	wl_list_insert(&wl->seats, &seat->link);
 	wl_seat_add_listener(wl_seat, &seat_listener, seat);
 	return true;

include/backend/wayland.h

@@ -105,6 +105,7 @@ struct wlr_wl_pointer {
 struct wlr_wl_seat {
 	char *name;
 	struct wl_seat *wl_seat;
+	uint32_t global_name;
 
 	struct wlr_wl_backend *backend;
 
@@ -148,7 +149,8 @@ void init_seat_touch(struct wlr_wl_seat *seat);
 void init_seat_tablet(struct wlr_wl_seat *seat);
 void finish_seat_tablet(struct wlr_wl_seat *seat);
 
-bool create_wl_seat(struct wl_seat *wl_seat, struct wlr_wl_backend *wl);
+bool create_wl_seat(struct wl_seat *wl_seat, struct wlr_wl_backend *wl,
+	uint32_t global_name);
 void destroy_wl_seat(struct wlr_wl_seat *seat);
 void destroy_wl_buffer(struct wlr_wl_buffer *buffer);