Struct StreamWriter 

pub struct StreamWriter { /* private fields */ }

What: A writer to the journal’s stream (standard error as the service manager connected it) that never waits for room. Why: O_NONBLOCK on the datagram socket does not make standard error non-blocking, and a journal that stops reading would fill the stream and block the service, and so the commits that wait for it. Each line is sent with MSG_DONTWAIT: a line that finds no room at all is dropped whole. A line the socket took only in part is finished within a short bound (three waits of at most 100 milliseconds), because the stream would otherwise carry half a line into the next one.

In TS you’d write (pseudocode):

try { socket.sendNonBlocking(line) } catch (error) { if (error.code === 'EAGAIN') drop(line) }

Implementations

impl StreamWriter

pub fn stderr() -> Self

A writer to standard error.

pub fn on(descriptor: RawFd) -> Self

A writer to a stream socket descriptor.

Trait Implementations

impl Clone for StreamWriter

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for StreamWriter

impl Debug for StreamWriter

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

Formats the value using the given formatter.

impl Write for StreamWriter

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

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

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

Attempts to write an entire buffer into this writer.

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

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

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

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)

Determines if this Writer has an efficient write_vectored implementation.

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

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

Attempts to write multiple buffers into this writer.

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

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.