Struct FILE 

pub struct FILE { /* private fields */ }

This represents the kernel <stdio.h> FILE type.

Implementations

impl FILE

pub const unsafe fn new(write: Option<FileCallback>, ptr: *mut c_void) -> Self

Creates a FILE that sends everything written to it to write, passing ptr as the callback’s first argument, like the C++ FILE(Callback* write, void* ptr) constructor.

Safety

For the lifetime of the returned FILE, write (if present) must be sound to call with ptr and any (data, len) where data points to len readable bytes when len > 0 (and may be null when len == 0).

pub fn write(&self, bytes: &[u8]) -> c_int

Writes bytes via the callback, like the C++ FILE::Write. This is what fprintf calls to do output.

Returns the callback’s result, or -1 if this FILE has no callback.

Trait Implementations

impl Write for FILE

fn write_str(&mut self, s: &str) -> Result

Writes a string slice into this writer, returning whether the write succeeded.

fn write_char(&mut self, c: char) -> Result<(), Error>

Writes a [char] into this writer, returning whether the write succeeded.

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

Glue for usage of the [write!] macro with implementors of this trait.