Struct dma_buf::MappedDmaBuf

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pub struct MappedDmaBuf { /* private fields */ }

Expand description

A DmaBuf mapped in memory

Implementations§

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impl MappedDmaBuf

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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

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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

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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.