Struct CharDevice

pub struct CharDevice<'a> { /* private fields */ }

Providing regular device operation for non-block device

Implementations

impl<'a> CharDevice<'a>

pub fn new(device: &'a mut Device) -> Result<Self>

Create a CharDevice for reading and writing non-block device.

If device is DeviceType::RT_Device_Class_Block, the method will return RtError::NoSys.

Trait Implementations

impl Read for CharDevice<'_>

type ReadError = RtError

Value of this type is returned when read() fails.

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

Pull some bytes from this source into the specified buffer, returning how many bytes were read.

fn read_exact( &mut self, buf: &mut [u8], ) -> Result<(), ReadExactError<Self::ReadError>>

Read the exact number of bytes required to fill buf.

fn available_bytes(&self, _at_least: usize) -> bool

Hints whether there are at least at_least bytes available.

fn chain<R>(self, other: R) -> Chain<Self, R>

where R: Read, Self: Sized,

Chains another reader after self. When self ends (returns Ok(0)), the other reader will provide bytes to read.

fn by_ref(&mut self) -> &mut Self

where Self: Sized,

Creates a “by reference” adaptor for this instance of Read.

impl Seek for CharDevice<'_>

fn seek(&mut self, pos: SeekFrom) -> Result<i64>

Seek to an offset, in bytes, in a stream.

impl Write for CharDevice<'_>

type WriteError = RtError

Value of this type is returned when write() fails.

type FlushError = RtError

Value of this type is returned when flush() fails. In case of low-level writers flush often does nothing and therefore doesn’t return error, so this type might be Void.

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

Write a buffer into this object, returning how many bytes were written.

fn flush(&mut self) -> Result<()>

Flush this output stream, ensuring that all intermediately buffered contents reach their destination.

fn size_hint(&mut self, _bytes: usize)

Hints the writer how much bytes will be written after call to this function. If the maximum amount of bytes to be written is known then it should be passed as argument. If the maximum amount is unknown, then minimum should be passed.

fn write_all(&mut self, buf: &[u8]) -> Result<(), Self::WriteError>

Attempts to write an entire buffer into this Write.

fn uses_size_hint(&self) -> bool

Reports to the caller whether size hint is actually used. This can prevent costly computation of size hint that would be thrown away.

impl WriteFmt for CharDevice<'_>

fn write_fmt(&mut self, fmt: Arguments<'_>) -> Result<()>