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server: use the new wl_priv_signal for wl_resource

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The old wl_signal is kept for backwards compatibility, as that is also
present in the deprecated public wl_resource struct, and that must be
kept working.

Signed-off-by: Giulio Camuffo <giulio.camuffo@kdab.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
This commit is contained in:
Giulio Camuffo 2017-01-24 16:34:30 +02:00 • committed by Pekka Paalanen
parent 7454aa9bb9
commit c44eed1c06
1 changed files with 46 additions and 6 deletions
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52
src/wayland-server.c
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@ -120,11 +120,16 @@ struct wl_resource {
struct wl_object object;
wl_resource_destroy_func_t destroy;
struct wl_list link;
struct wl_signal destroy_signal;
/* Unfortunately some users of libwayland (e.g. mesa) still use the
* deprecated wl_resource struct, even if creating it with the new
* wl_resource_create(). So we cannot change the layout of the struct
* unless after the data field. */
struct wl_signal deprecated_destroy_signal;
struct wl_client *client;
void *data;
int version;
wl_dispatcher_func_t dispatcher;
struct wl_priv_signal destroy_signal;
};
struct wl_protocol_logger {
@ -600,6 +605,31 @@ wl_resource_post_no_memory(struct wl_resource *resource)
WL_DISPLAY_ERROR_NO_MEMORY, "no memory");
}
/** Detect if a wl_resource uses the deprecated public definition.
*
* Before Wayland 1.2.0, the definition of struct wl_resource was public.
* It was made opaque just before 1.2.0, and later new fields were added.
* The new fields cannot be accessed if a program is using the deprecated
* defition, as there would not be memory allocated for them.
*
* The creation pattern for the deprecated definition was wl_resource_init()
* followed by wl_client_add_resource(). wl_resource_init() was an inline
* function and no longer exists, but binaries might still carry it.
* wl_client_add_resource() still exists for ABI compatiblity.
*/
static bool
resource_is_deprecated(struct wl_resource *resource)
{
struct wl_map *map = &resource->client->objects;
int id = resource->object.id;
/* wl_client_add_resource() marks deprecated resources with the flag. */
if (wl_map_lookup_flags(map, id) & WL_MAP_ENTRY_LEGACY)
return true;
return false;
}
static enum wl_iterator_result
destroy_resource(void *element, void *data)
{
@ -607,7 +637,11 @@ destroy_resource(void *element, void *data)
struct wl_client *client = resource->client;
uint32_t flags;
wl_signal_emit(&resource->destroy_signal, resource);
wl_signal_emit(&resource->deprecated_destroy_signal, resource);
/* Don't emit the new signal for deprecated resources, as that would
* access memory outside the bounds of the deprecated struct */
if (!resource_is_deprecated(resource))
wl_priv_signal_emit(&resource->destroy_signal, resource);
flags = wl_map_lookup_flags(&client->objects, resource->object.id);
if (resource->destroy)
@ -719,14 +753,19 @@ WL_EXPORT void
wl_resource_add_destroy_listener(struct wl_resource *resource,
struct wl_listener * listener)
{
wl_signal_add(&resource->destroy_signal, listener);
if (resource_is_deprecated(resource))
wl_signal_add(&resource->deprecated_destroy_signal, listener);
else
wl_priv_signal_add(&resource->destroy_signal, listener);
}
WL_EXPORT struct wl_listener *
wl_resource_get_destroy_listener(struct wl_resource *resource,
wl_notify_func_t notify)
{
return wl_signal_get(&resource->destroy_signal, notify);
if (resource_is_deprecated(resource))
return wl_signal_get(&resource->deprecated_destroy_signal, notify);
return wl_priv_signal_get(&resource->destroy_signal, notify);
}
/** Retrieve the interface name (class) of a resource object.
@ -1559,7 +1598,8 @@ wl_resource_create(struct wl_client *client,
resource->object.interface = interface;
resource->object.implementation = NULL;
wl_signal_init(&resource->destroy_signal);
wl_signal_init(&resource->deprecated_destroy_signal);
wl_priv_signal_init(&resource->destroy_signal);
resource->destroy = NULL;
resource->client = client;
@ -1927,7 +1967,7 @@ wl_client_add_resource(struct wl_client *client,
}
resource->client = client;
wl_signal_init(&resource->destroy_signal);
wl_signal_init(&resource->deprecated_destroy_signal);
return resource->object.id;
}