Struct ExtSessionLockV1

pub struct ExtSessionLockV1 { /* private fields */ }

Available on crate feature wayland and Linux only.

manage lock state and create lock surfaces

In response to the creation of this object the compositor must send either the locked or finished event.

The locked event indicates that the session is locked. This means that the compositor must stop rendering and providing input to normal clients. Instead the compositor must blank all outputs with an opaque color such that their normal content is fully hidden.

The only surfaces that should be rendered while the session is locked are the lock surfaces created through this interface and optionally, at the compositor’s discretion, special privileged surfaces such as input methods or portions of desktop shell UIs.

The locked event must not be sent until a new “locked” frame (either from a session lock surface or the compositor blanking the output) has been presented on all outputs and no security sensitive normal/unlocked content is possibly visible.

The finished event should be sent immediately on creation of this object if the compositor decides that the locked event will not be sent.

The compositor may wait for the client to create and render session lock surfaces before sending the locked event to avoid displaying intermediate blank frames. However, it must impose a reasonable time limit if waiting and send the locked event as soon as the hard requirements described above can be met if the time limit expires. Clients should immediately create lock surfaces for all outputs on creation of this object to make this possible.

This behavior of the locked event is required in order to prevent possible race conditions with clients that wish to suspend the system or similar after locking the session. Without these semantics, clients triggering a suspend after receiving the locked event would race with the first “locked” frame being presented and normal/unlocked frames might be briefly visible as the system is resumed if the suspend operation wins the race.

If the client dies while the session is locked, the compositor must not unlock the session in response. It is acceptable for the session to be permanently locked if this happens. The compositor may choose to continue to display the lock surfaces the client had mapped before it died or alternatively fall back to a solid color, this is compositor policy.

Compositors may also allow a secure way to recover the session, the details of this are compositor policy. Compositors may allow a new client to create a ext_session_lock_v1 object and take responsibility for unlocking the session, they may even start a new lock client instance automatically.

See also the Event enum for this interface.

Implementations

impl ExtSessionLockV1

pub fn destroy(&self)

destroy the session lock

This informs the compositor that the lock object will no longer be used. Existing objects created through this interface remain valid.

After this request is made, lock surfaces created through this object should be destroyed by the client as they will no longer be used by the compositor.

It is a protocol error to make this request if the locked event was sent, the unlock_and_destroy request must be used instead.

pub fn get_lock_surface<U, D>( &self, surface: &WlSurface, output: &WlOutput, qh: &QueueHandle<D>, udata: U, ) -> ExtSessionLockSurfaceV1

where U: Send + Sync + 'static, D: Dispatch<ExtSessionLockSurfaceV1, U> + 'static,

create a lock surface for a given output

The client is expected to create lock surfaces for all outputs currently present and any new outputs as they are advertised. These won’t be displayed by the compositor unless the lock is successful and the locked event is sent.

Providing a wl_surface which already has a role or already has a buffer attached or committed is a protocol error, as is attaching/committing a buffer before the first ext_session_lock_surface_v1.configure event.

Attempting to create more than one lock surface for a given output is a duplicate_output protocol error.

pub fn unlock_and_destroy(&self)

unlock the session, destroying the object

This request indicates that the session should be unlocked, for example because the user has entered their password and it has been verified by the client.

This request also informs the compositor that the lock object will no longer be used and should be destroyed. Existing objects created through this interface remain valid.

After this request is made, lock surfaces created through this object should be destroyed by the client as they will no longer be used by the compositor.

It is a protocol error to make this request if the locked event has not been sent. In that case, the lock object must be destroyed using the destroy request.

Note that a correct client that wishes to exit directly after unlocking the session must use the wl_display.sync request to ensure the server receives and processes the unlock_and_destroy request. Otherwise there is no guarantee that the server has unlocked the session due to the asynchronous nature of the Wayland protocol. For example, the server might terminate the client with a protocol error before it processes the unlock_and_destroy request.

Trait Implementations

impl Borrow<ObjectId> for ExtSessionLockV1

fn borrow(&self) -> &ObjectId

Immutably borrows from an owned value.

impl Clone for ExtSessionLockV1

fn clone(&self) -> ExtSessionLockV1

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ExtSessionLockV1

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<D> Dispatch<ExtSessionLockV1, SessionLockData, D> for SessionLockState

where D: Dispatch<ExtSessionLockV1, SessionLockData> + SessionLockHandler,

fn event( state: &mut D, proxy: &ExtSessionLockV1, event: Event, _: &SessionLockData, conn: &Connection, qh: &QueueHandle<D>, )

Called when an event from the server is processed

fn event_created_child( opcode: u16, _qhandle: &QueueHandle<State>, ) -> Arc<dyn ObjectData>

Method used to initialize the user-data of objects created by events

impl Hash for ExtSessionLockV1

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq<Weak<ExtSessionLockV1>> for ExtSessionLockV1

fn eq(&self, other: &Weak<ExtSessionLockV1>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialEq for ExtSessionLockV1

fn eq(&self, other: &ExtSessionLockV1) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Proxy for ExtSessionLockV1

type Request<'request> = Request<'request>

The request enum for this interface

type Event = Event

The event enum for this interface

fn interface() -> &'static Interface

The interface description

fn id(&self) -> ObjectId

The ID of this object

fn version(&self) -> u32

The version of this object

fn data<U>(&self) -> Option<&U>

where U: Send + Sync + 'static,

Access the user-data associated with this object

fn object_data(&self) -> Option<&Arc<dyn ObjectData>>

Access the raw data associated with this object.

fn backend(&self) -> &WeakBackend

Access the backend associated with this object

fn send_request( &self, req: <ExtSessionLockV1 as Proxy>::Request<'_>, ) -> Result<(), InvalidId>

Send a request for this object.

fn send_constructor<I>( &self, req: <ExtSessionLockV1 as Proxy>::Request<'_>, data: Arc<dyn ObjectData>, ) -> Result<I, InvalidId>

where I: Proxy,

Send a request for this object that creates another object.

fn from_id( conn: &Connection, id: ObjectId, ) -> Result<ExtSessionLockV1, InvalidId>

Create an object proxy from its ID

fn inert(backend: WeakBackend) -> ExtSessionLockV1

Create an inert object proxy

fn parse_event( conn: &Connection, msg: Message<ObjectId, OwnedFd>, ) -> Result<(ExtSessionLockV1, <ExtSessionLockV1 as Proxy>::Event), DispatchError>

Parse a event for this object

fn write_request<'a>( &self, conn: &Connection, msg: <ExtSessionLockV1 as Proxy>::Request<'a>, ) -> Result<(Message<ObjectId, BorrowedFd<'a>>, Option<(&'static Interface, u32)>), InvalidId>

Serialize a request for this object

fn is_alive(&self) -> bool

Checks if the Wayland object associated with this proxy is still alive

fn downgrade(&self) -> Weak<Self>

Creates a weak handle to this object

impl Eq for ExtSessionLockV1