Struct std::io::StderrLock

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

A locked reference to the Stderr handle.

This handle implements the Write trait and is constructed via the Stderr::lock method. See its documentation for more.

Note: Windows Portability Considerations

When operating in a console, the Windows implementation of this stream does not support non-UTF-8 byte sequences. Attempting to write bytes that are not valid UTF-8 will return an error.

In a process with a detached console, such as one using #![windows_subsystem = "windows"], or in a child process spawned from such a process, the contained handle will be null. In such cases, the standard library’s Read and Write will do nothing and silently succeed. All other I/O operations, via the standard library or via raw Windows API calls, will fail.

Trait Implementations

impl<'a> AsFd for StderrLock<'a>

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

🔬 This is a nightly-only experimental API. (io_safety #87074)

This is supported on Unix only.

Borrows the file descriptor.

impl<'a> AsHandle for StderrLock<'a>

This is supported on Windows only.

fn as_handle(&self) -> BorrowedHandle<'_>

🔬 This is a nightly-only experimental API. (io_safety #87074)

Borrows the handle.

impl<'a> AsRawFd for StderrLock<'a>

fn as_raw_fd(&self) -> RawFd

This is supported on Unix only.

Extracts the raw file descriptor.

impl<'a> AsRawHandle for StderrLock<'a>

This is supported on Windows only.

fn as_raw_handle(&self) -> RawHandle

Extracts the raw handle.

impl Debug for StderrLock<'_>

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

Formats the value using the given formatter.

impl Write for StderrLock<'_>

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

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

fn write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> Result<usize>

Like write, except that it writes from a slice of buffers.

fn is_write_vectored(&self) -> bool

🔬 This is a nightly-only experimental API. (can_vector #69941)

Determines if this Writer has an efficient write_vectored implementation.

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

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

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

Attempts to write an entire buffer into this writer.

fn write_all_vectored(&mut self, bufs: &mut [IoSlice<'_>]) -> Result<()>

🔬 This is a nightly-only experimental API. (write_all_vectored #70436)

Attempts to write multiple buffers into this writer.

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

Writes a formatted string into this writer, returning any error encountered.

fn by_ref(&mut self) -> &mut Self where
    Self: Sized, 

Creates a “by reference” adapter for this instance of Write.