swaylock: Support keyboard and pointer disconnects and reconnects

include/swaylock/swaylock.h

@@ -58,6 +58,8 @@ struct swaylock_state {
 	struct wl_compositor *compositor;
 	struct zwlr_layer_shell_v1 *layer_shell;
 	struct zwlr_input_inhibit_manager_v1 *input_inhibit_manager;
+	struct wl_pointer *pointer;
+	struct wl_keyboard *keyboard;
 	struct wl_shm *shm;
 	struct wl_list surfaces;
 	struct wl_list images;

swaylock/main.c

@@ -277,7 +277,7 @@ static void handle_global(void *data, struct wl_registry *registry,
 				&wl_shm_interface, 1);
 	} else if (strcmp(interface, wl_seat_interface.name) == 0) {
 		struct wl_seat *seat = wl_registry_bind(
-				registry, name, &wl_seat_interface, 1);
+				registry, name, &wl_seat_interface, 3);
 		wl_seat_add_listener(seat, &seat_listener, state);
 	} else if (strcmp(interface, zwlr_layer_shell_v1_interface.name) == 0) {
 		state->layer_shell = wl_registry_bind(

swaylock/seat.c

@@ -145,13 +145,21 @@ static const struct wl_pointer_listener pointer_listener = {
 static void seat_handle_capabilities(void *data, struct wl_seat *wl_seat,
 		enum wl_seat_capability caps) {
 	struct swaylock_state *state = data;
+	if (state->pointer) {
+		wl_pointer_release(state->pointer);
+		state->pointer = NULL;
+	}
+	if (state->keyboard) {
+		wl_keyboard_release(state->keyboard);
+		state->keyboard = NULL;
+	}
 	if ((caps & WL_SEAT_CAPABILITY_POINTER)) {
-		struct wl_pointer *pointer = wl_seat_get_pointer(wl_seat);
-		wl_pointer_add_listener(pointer, &pointer_listener, NULL);
+		state->pointer = wl_seat_get_pointer(wl_seat);
+		wl_pointer_add_listener(state->pointer, &pointer_listener, NULL);
 	}
 	if ((caps & WL_SEAT_CAPABILITY_KEYBOARD)) {
-		struct wl_keyboard *keyboard = wl_seat_get_keyboard(wl_seat);
-		wl_keyboard_add_listener(keyboard, &keyboard_listener, state);
+		state->keyboard = wl_seat_get_keyboard(wl_seat);
+		wl_keyboard_add_listener(state->keyboard, &keyboard_listener, state);
 	}
 }