Struct DevFileObject 

pub struct DevFileObject {
    node: Arc<DevNode>,
    position: RwLock<u64>,
    device_id: usize,
    device_type: DeviceType,
    device_guard: Option<Arc<dyn Device>>,
}

A file object for device files in DevFS

This struct provides a FileObject implementation that delegates device operations to the underlying device registered in DeviceManager.

Fields

node: Arc<DevNode>

Reference to the DevNode

position: RwLock<u64>

Current file position (for seekable devices)

device_id: usize

Device ID for lookup in DeviceManager

device_type: DeviceType

Device type

device_guard: Option<Arc<dyn Device>>

Optional device guard for device files

Implementations

impl DevFileObject

pub fn new( node: Arc<DevNode>, device_id: usize, device_type: DeviceType, ) -> Result<Self, FileSystemError>

Create a new file object for device files

fn read_device(&self, buffer: &mut [u8]) -> Result<usize, FileSystemError>

Read from the underlying device at current position

fn write_device(&self, buffer: &[u8]) -> Result<usize, FileSystemError>

Write to the underlying device at current position

Trait Implementations

impl ControlOps for DevFileObject

fn control(&self, command: u32, arg: usize) -> Result<i32, &'static str>

Perform a control operation

fn supported_control_commands(&self) -> Vec<(u32, &'static str)>

Get a list of supported control commands

impl FileObject for DevFileObject

fn seek(&self, whence: SeekFrom) -> Result<u64, StreamError>

Seek to a position in the file stream

fn metadata(&self) -> Result<FileMetadata, StreamError>

Get metadata about the file

fn truncate(&self, _size: u64) -> Result<(), StreamError>

Truncate the file to the specified size

fn as_any(&self) -> &dyn Any

fn read_at(&self, offset: u64, buffer: &mut [u8]) -> Result<usize, StreamError>

Read data from a specific offset without changing internal position

fn write_at(&self, offset: u64, buffer: &[u8]) -> Result<usize, StreamError>

Write data to a specific offset without changing internal position

fn sync(&self) -> Result<(), StreamError>

Synchronize file content to storage

impl MemoryMappingOps for DevFileObject

fn get_mapping_info( &self, offset: usize, length: usize, ) -> Result<(usize, usize, bool), &'static str>

Get mapping information for a region of the object

fn on_mapped(&self, vaddr: usize, paddr: usize, length: usize, offset: usize)

Notification that a mapping has been created

fn on_unmapped(&self, vaddr: usize, length: usize)

Notification that a mapping has been removed

fn supports_mmap(&self) -> bool

Check if memory mapping is supported

fn get_mapping_info_with( &self, offset: usize, length: usize, _is_shared: bool, ) -> Result<(usize, usize, bool), &'static str>

Get mapping information with sharing intent.

fn mmap_owner_name(&self) -> String

Diagnostic helper: return a short owner name for logging

fn resolve_fault( &self, access: &AccessKind, map: &VirtualMemoryMap, ) -> Result<ResolveFaultResult, ResolveFaultError>

impl Selectable for DevFileObject

fn current_ready(&self, interest: ReadyInterest) -> ReadySet

Return current readiness for the given interest set.

fn wait_until_ready( &self, interest: ReadyInterest, trapframe: &mut Trapframe, timeout_ticks: Option<u64>, ) -> SelectWaitOutcome

Block the current task using the provided trapframe until the interest becomes ready or the optional timeout (in ticks) expires.

fn set_nonblocking(&self, enabled: bool)

Enable or disable non-blocking I/O semantics on this object.

fn is_nonblocking(&self) -> bool

Query whether non-blocking I/O semantics are enabled on this object.

impl StreamOps for DevFileObject

fn read(&self, buffer: &mut [u8]) -> Result<usize, StreamError>

Read data from the stream

fn write(&self, buffer: &[u8]) -> Result<usize, StreamError>

Write data to the stream