Struct GetLayerReply 

pub struct GetLayerReply {
    pub dir_count: u32,
}

Reply from GetLayer: the number of diff-directory slots in the logical FD array.

GetLayer is a streaming method (more): it yields multiple frames, each carrying a batch of FDs. The client MUST concatenate the FD batches from all frames (in arrival order) to reconstruct the full logical FD array:

• fds[0] — data pipe read end (carries the splitdirfdstream bytes).
• fds[1..=dir_count] — the dirfds region (dir_count slots total). The real objects-directory fd sits at a sparse, hash-determined index within this region; the remaining (gap) slots hold inert dummy fds that reconstruct never dereferences. The sparse placement is encoded in each FileBackedData chunk’s dirfd_index; the client passes the whole region to drain_splitdirfdstream / reconstruct unchanged and must NOT assume the dir is at a fixed index.
• fds[dir_count+1..] — opaque lifetime FDs. The client MUST hold every one of these open until it has finished reading and processing all dir fds, then close them all to signal completion to the server. The count of trailing FDs is unspecified by contract; the client keeps open whatever it does not otherwise recognise. This lifetime-FD convention is part of the splitdirfdstream-v0 feature.

Each transport frame carries at most MAX_FDS_PER_FRAME (240) fds, safely below the kernel SCM_MAX_FD (253) limit. Every frame carries the same dir_count; the client should use the value from any frame (they are all identical). The stream terminates when a frame with continues=false is received.

A non-streaming (more=false) call delivers all fds in a single frame; if the layer requires more than MAX_FDS_PER_FRAME fds the call returns FdLimitExceeded and the client must retry with more=true.

Fields

dir_count: u32

Number of diff-directory file descriptors in the full logical FD array (i.e. fds[1..=dir_count] after concatenating all frames’ batches).

Trait Implementations

impl Clone for GetLayerReply

fn clone(&self) -> GetLayerReply

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for GetLayerReply

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for GetLayerReply

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl From<GetLayerReply> for __CfsctlServiceReplyStreamParams

fn from(v: GetLayerReply) -> Self

Converts to this type from the input type.

impl Serialize for GetLayerReply

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Type for GetLayerReply

const TYPE: &'static Type<'static>

The type information.