Struct NullDev

pub struct NullDev;

A null device behaves like /dev/null.

Nothing can be read and all writes are discarded.

Trait Implementations

impl VfsNodeOps for NullDev

fn get_attr(&self) -> VfsResult<VfsNodeAttr>

Get the attributes of the node.

fn read_at(&self, _offset: u64, _buf: &mut [u8]) -> VfsResult<usize>

Read data from the file at the given offset.

fn write_at(&self, _offset: u64, buf: &[u8]) -> VfsResult<usize>

Write data to the file at the given offset.

fn truncate(&self, _size: u64) -> VfsResult

Truncate the file to the given size.

fn lookup(self: Arc<Self>, _path: &str) -> VfsResult<VfsNodeRef>

Lookup the node with given path in the directory.

fn create(&self, _path: &str, _ty: VfsNodeType) -> VfsResult

Create a new node with the given path in the directory

fn remove(&self, _path: &str) -> VfsResult

Remove the node with the given path in the directory.

fn read_dir( &self, _start_idx: usize, _dirents: &mut [VfsDirEntry], ) -> VfsResult<usize>

Read directory entries into dirents, starting from start_idx.

fn as_any(&self) -> &dyn Any

Convert &self to &dyn Any that can use Any::downcast_ref.

fn open(&self) -> Result<(), AxError>

Do something when the node is opened.

fn release(&self) -> Result<(), AxError>

Do something when the node is closed.

fn fsync(&self) -> Result<(), AxError>

Flush the file, synchronize the data to disk.

fn parent(&self) -> Option<Arc<dyn VfsNodeOps>>

Get the parent directory of this directory.

fn rename(&self, _src_path: &str, _dst_path: &str) -> Result<(), AxError>

Renames or moves existing file or directory.