Struct UserSliceWriter 

pub struct UserSliceWriter { /* private fields */ }

A writer for UserSlice.

Used to incrementally write into the user slice.

Implementations

impl UserSliceWriter

pub fn len(&self) -> usize

Returns the amount of space remaining in this buffer.

Note that even writing less than this number of bytes may fail.

pub fn is_empty(&self) -> bool

Returns true if no more data can be written to this buffer.

pub fn write_slice(&mut self, data: &[u8]) -> Result

Writes raw data to this user pointer from a kernel buffer.

Fails with EFAULT if the write happens on a bad address, or if the write goes out of bounds of this UserSliceWriter. This call may modify the associated userspace slice even if it returns an error.

pub fn write_slice_partial( &mut self, data: &[u8], offset: usize, ) -> Result<usize>

Writes raw data to this user pointer from a kernel buffer partially.

This is the same as Self::write_slice but considers the given offset into data and truncates the write to the boundaries of self and data.

On success, returns the number of bytes written.

pub fn write_slice_file( &mut self, data: &[u8], offset: &mut Offset, ) -> Result<usize>

Writes raw data to this user pointer from a kernel buffer partially.

This is the same as Self::write_slice_partial but updates the given file::Offset by the number of bytes written.

This is equivalent to C’s simple_read_from_buffer().

On success, returns the number of bytes written.

pub fn write<T: AsBytes>(&mut self, value: &T) -> Result

Writes the provided Rust value to this userspace pointer.

Fails with EFAULT if the write happens on a bad address, or if the write goes out of bounds of this UserSliceWriter. This call may modify the associated userspace slice even if it returns an error.