wlroots/util/global.c

#include <stdlib.h>
#include "util/global.h"

struct destroy_global_data {
	struct wl_global *global;
	struct wl_event_source *event_source;
};

static int destroy_global(void *_data) {
	struct destroy_global_data *data = _data;
	wl_global_destroy(data->global);
	wl_event_source_remove(data->event_source);
	free(data);
	return 0;
}

void wlr_global_destroy_safe(struct wl_global *global,
		struct wl_display *display) {
	// Don't destroy the global immediately. If the global has been created
	// recently, clients might try to bind to it after we've destroyed it.
	// Instead, remove the global so that clients stop seeing it and wait an
	// arbitrary amount of time before destroying the global as a workaround.
	// See: https://gitlab.freedesktop.org/wayland/wayland/issues/10

	wl_global_remove(global);
	wl_global_set_user_data(global, NULL); // safety net

	struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
	struct destroy_global_data *data = calloc(1, sizeof(*data));
	if (data == NULL) {
		wl_global_destroy(global);
		return;
	}
	data->global = global;
	data->event_source =
		wl_event_loop_add_timer(event_loop, destroy_global, data);
	if (data->event_source == NULL) {
		free(data);
		wl_global_destroy(global);
		return;
	}
	wl_event_source_timer_update(data->event_source, 5000);
}