Struct dma_buf::MappedDmaBuf

pub struct MappedDmaBuf { /* private fields */ }

A DmaBuf mapped in memory

Implementations

impl MappedDmaBuf

pub fn read<A, F, R>(&self, f: F, arg: Option<A>) -> Result<R, BufferError>

where F: Fn(&[u8], Option<A>) -> Result<R, Box<dyn Error>>,

Calls a closure to read the buffer content

DMA-Buf requires the user-space to call the DMA_BUF_IOCTL_SYNC ioctl before and after any CPU access to a buffer in order to maintain the cache coherency. The closure will be run with those primitives called for a read access from the CPU.

The result of the closure will be returned.

Errors

Will return [Error] if the underlying ioctl or the closure fails

pub fn readwrite<A, F, R>( &mut self, f: F, arg: Option<A> ) -> Result<R, BufferError>

where F: Fn(&mut [u8], Option<A>) -> Result<R, Box<dyn Error>>,

Calls a closure to read from and write to the buffer content

DMA-Buf requires the user-space to call the DMA_BUF_IOCTL_SYNC ioctl before and after any CPU access to a buffer in order to maintain the cache coherency. The closure will be run with those primitives called for a read and write access from the CPU.

The result of the closure will be returned on success. On failure, the closure must return Error::Closure

Errors

Will return [Error] if the underlying ioctl or the closure fails

pub fn write<A, F>(&mut self, f: F, arg: Option<A>) -> Result<(), BufferError>

where F: Fn(&mut [u8], Option<A>) -> Result<(), Box<dyn Error>>,

Calls a closure to read from and write to the buffer content

DMA-Buf requires the user-space to call the DMA_BUF_IOCTL_SYNC ioctl before and after any CPU access to a buffer in order to maintain the cache coherency. The closure will be run with those primitives called for a read and write access from the CPU.

The closure must return () on success. On failure, the closure must return Error::Closure.

Errors

Will return [Error] if the underlying ioctl or the closure fails

Trait Implementations

impl AsFd for MappedDmaBuf

fn as_fd(&self) -> BorrowedFd<'_>

Borrows the file descriptor.

impl AsRawFd for MappedDmaBuf

fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor.

impl Debug for MappedDmaBuf

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

Formats the value using the given formatter.

impl Drop for MappedDmaBuf

fn drop(&mut self)

Executes the destructor for this type.