pub struct Stderr { /* private fields */ }
Expand description
A handle to the standard error stream of a process.
Concurrent writes to stderr must be executed with care: Only individual
writes to this AsyncWrite
are guaranteed to be intact. In particular
you should be aware that writes using write_all
are not guaranteed
to occur as a single write, so multiple threads writing data with
write_all
may result in interleaved output.
Created by the stderr
function.
Examples
use tokio::io::{self, AsyncWriteExt};
#[tokio::main]
async fn main() -> io::Result<()> {
let mut stderr = io::stdout();
stderr.write_all(b"Print some error here.").await?;
Ok(())
}
Trait Implementations§
source§impl AsFd for Stderr
impl AsFd for Stderr
source§fn as_fd(&self) -> BorrowedFd<'_>
fn as_fd(&self) -> BorrowedFd<'_>
Borrows the file descriptor. Read more
source§impl AsyncWrite for Stderr
impl AsyncWrite for Stderr
source§fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8]
) -> Poll<Result<usize>>
fn poll_write( self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8] ) -> Poll<Result<usize>>
Attempt to write bytes from
buf
into the object. Read moresource§fn poll_flush(
self: Pin<&mut Self>,
cx: &mut Context<'_>
) -> Poll<Result<(), Error>>
fn poll_flush( self: Pin<&mut Self>, cx: &mut Context<'_> ) -> Poll<Result<(), Error>>
Attempts to flush the object, ensuring that any buffered data reach
their destination. Read more
source§fn poll_shutdown(
self: Pin<&mut Self>,
cx: &mut Context<'_>
) -> Poll<Result<(), Error>>
fn poll_shutdown( self: Pin<&mut Self>, cx: &mut Context<'_> ) -> Poll<Result<(), Error>>
Initiates or attempts to shut down this writer, returning success when
the I/O connection has completely shut down. Read more
source§fn poll_write_vectored(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
bufs: &[IoSlice<'_>]
) -> Poll<Result<usize, Error>>
fn poll_write_vectored( self: Pin<&mut Self>, cx: &mut Context<'_>, bufs: &[IoSlice<'_>] ) -> Poll<Result<usize, Error>>
Like
poll_write
, except that it writes from a slice of buffers. Read moresource§fn is_write_vectored(&self) -> bool
fn is_write_vectored(&self) -> bool
Determines if this writer has an efficient
poll_write_vectored
implementation. Read moreAuto Trait Implementations§
impl RefUnwindSafe for Stderr
impl Send for Stderr
impl Sync for Stderr
impl Unpin for Stderr
impl UnwindSafe for Stderr
Blanket Implementations§
source§impl<W> AsyncWriteExt for Wwhere
W: AsyncWrite + ?Sized,
impl<W> AsyncWriteExt for Wwhere W: AsyncWrite + ?Sized,
source§fn write<'a>(&'a mut self, src: &'a [u8]) -> Write<'a, Self>where
Self: Unpin,
fn write<'a>(&'a mut self, src: &'a [u8]) -> Write<'a, Self>where Self: Unpin,
Writes a buffer into this writer, returning how many bytes were
written. Read more
source§fn write_vectored<'a, 'b>(
&'a mut self,
bufs: &'a [IoSlice<'b>]
) -> WriteVectored<'a, 'b, Self>where
Self: Unpin,
fn write_vectored<'a, 'b>( &'a mut self, bufs: &'a [IoSlice<'b>] ) -> WriteVectored<'a, 'b, Self>where Self: Unpin,
source§fn write_buf<'a, B>(&'a mut self, src: &'a mut B) -> WriteBuf<'a, Self, B>where
Self: Sized + Unpin,
B: Buf,
fn write_buf<'a, B>(&'a mut self, src: &'a mut B) -> WriteBuf<'a, Self, B>where Self: Sized + Unpin, B: Buf,
Writes a buffer into this writer, advancing the buffer’s internal
cursor. Read more
source§fn write_all_buf<'a, B>(
&'a mut self,
src: &'a mut B
) -> WriteAllBuf<'a, Self, B>where
Self: Sized + Unpin,
B: Buf,
fn write_all_buf<'a, B>( &'a mut self, src: &'a mut B ) -> WriteAllBuf<'a, Self, B>where Self: Sized + Unpin, B: Buf,
Attempts to write an entire buffer into this writer. Read more
source§fn write_all<'a>(&'a mut self, src: &'a [u8]) -> WriteAll<'a, Self>where
Self: Unpin,
fn write_all<'a>(&'a mut self, src: &'a [u8]) -> WriteAll<'a, Self>where Self: Unpin,
Attempts to write an entire buffer into this writer. Read more
source§fn write_u8<'a>(&'a mut self, n: u8) -> WriteU8<&'a mut Self>where
Self: Unpin,
fn write_u8<'a>(&'a mut self, n: u8) -> WriteU8<&'a mut Self>where Self: Unpin,
Writes an unsigned 8-bit integer to the underlying writer. Read more
source§fn write_i8<'a>(&'a mut self, n: i8) -> WriteI8<&'a mut Self>where
Self: Unpin,
fn write_i8<'a>(&'a mut self, n: i8) -> WriteI8<&'a mut Self>where Self: Unpin,
Writes a signed 8-bit integer to the underlying writer. Read more
source§fn write_u16<'a>(&'a mut self, n: u16) -> WriteU16<&'a mut Self>where
Self: Unpin,
fn write_u16<'a>(&'a mut self, n: u16) -> WriteU16<&'a mut Self>where Self: Unpin,
Writes an unsigned 16-bit integer in big-endian order to the
underlying writer. Read more
source§fn write_i16<'a>(&'a mut self, n: i16) -> WriteI16<&'a mut Self>where
Self: Unpin,
fn write_i16<'a>(&'a mut self, n: i16) -> WriteI16<&'a mut Self>where Self: Unpin,
Writes a signed 16-bit integer in big-endian order to the
underlying writer. Read more
source§fn write_u32<'a>(&'a mut self, n: u32) -> WriteU32<&'a mut Self>where
Self: Unpin,
fn write_u32<'a>(&'a mut self, n: u32) -> WriteU32<&'a mut Self>where Self: Unpin,
Writes an unsigned 32-bit integer in big-endian order to the
underlying writer. Read more
source§fn write_i32<'a>(&'a mut self, n: i32) -> WriteI32<&'a mut Self>where
Self: Unpin,
fn write_i32<'a>(&'a mut self, n: i32) -> WriteI32<&'a mut Self>where Self: Unpin,
Writes a signed 32-bit integer in big-endian order to the
underlying writer. Read more
source§fn write_u64<'a>(&'a mut self, n: u64) -> WriteU64<&'a mut Self>where
Self: Unpin,
fn write_u64<'a>(&'a mut self, n: u64) -> WriteU64<&'a mut Self>where Self: Unpin,
Writes an unsigned 64-bit integer in big-endian order to the
underlying writer. Read more
source§fn write_i64<'a>(&'a mut self, n: i64) -> WriteI64<&'a mut Self>where
Self: Unpin,
fn write_i64<'a>(&'a mut self, n: i64) -> WriteI64<&'a mut Self>where Self: Unpin,
Writes an signed 64-bit integer in big-endian order to the
underlying writer. Read more
source§fn write_u128<'a>(&'a mut self, n: u128) -> WriteU128<&'a mut Self>where
Self: Unpin,
fn write_u128<'a>(&'a mut self, n: u128) -> WriteU128<&'a mut Self>where Self: Unpin,
Writes an unsigned 128-bit integer in big-endian order to the
underlying writer. Read more
source§fn write_i128<'a>(&'a mut self, n: i128) -> WriteI128<&'a mut Self>where
Self: Unpin,
fn write_i128<'a>(&'a mut self, n: i128) -> WriteI128<&'a mut Self>where Self: Unpin,
Writes an signed 128-bit integer in big-endian order to the
underlying writer. Read more
source§fn write_f32<'a>(&'a mut self, n: f32) -> WriteF32<&'a mut Self>where
Self: Unpin,
fn write_f32<'a>(&'a mut self, n: f32) -> WriteF32<&'a mut Self>where Self: Unpin,
Writes an 32-bit floating point type in big-endian order to the
underlying writer. Read more
source§fn write_f64<'a>(&'a mut self, n: f64) -> WriteF64<&'a mut Self>where
Self: Unpin,
fn write_f64<'a>(&'a mut self, n: f64) -> WriteF64<&'a mut Self>where Self: Unpin,
Writes an 64-bit floating point type in big-endian order to the
underlying writer. Read more
source§fn write_u16_le<'a>(&'a mut self, n: u16) -> WriteU16Le<&'a mut Self>where
Self: Unpin,
fn write_u16_le<'a>(&'a mut self, n: u16) -> WriteU16Le<&'a mut Self>where Self: Unpin,
Writes an unsigned 16-bit integer in little-endian order to the
underlying writer. Read more
source§fn write_i16_le<'a>(&'a mut self, n: i16) -> WriteI16Le<&'a mut Self>where
Self: Unpin,
fn write_i16_le<'a>(&'a mut self, n: i16) -> WriteI16Le<&'a mut Self>where Self: Unpin,
Writes a signed 16-bit integer in little-endian order to the
underlying writer. Read more
source§fn write_u32_le<'a>(&'a mut self, n: u32) -> WriteU32Le<&'a mut Self>where
Self: Unpin,
fn write_u32_le<'a>(&'a mut self, n: u32) -> WriteU32Le<&'a mut Self>where Self: Unpin,
Writes an unsigned 32-bit integer in little-endian order to the
underlying writer. Read more
source§fn write_i32_le<'a>(&'a mut self, n: i32) -> WriteI32Le<&'a mut Self>where
Self: Unpin,
fn write_i32_le<'a>(&'a mut self, n: i32) -> WriteI32Le<&'a mut Self>where Self: Unpin,
Writes a signed 32-bit integer in little-endian order to the
underlying writer. Read more
source§fn write_u64_le<'a>(&'a mut self, n: u64) -> WriteU64Le<&'a mut Self>where
Self: Unpin,
fn write_u64_le<'a>(&'a mut self, n: u64) -> WriteU64Le<&'a mut Self>where Self: Unpin,
Writes an unsigned 64-bit integer in little-endian order to the
underlying writer. Read more
source§fn write_i64_le<'a>(&'a mut self, n: i64) -> WriteI64Le<&'a mut Self>where
Self: Unpin,
fn write_i64_le<'a>(&'a mut self, n: i64) -> WriteI64Le<&'a mut Self>where Self: Unpin,
Writes an signed 64-bit integer in little-endian order to the
underlying writer. Read more
source§fn write_u128_le<'a>(&'a mut self, n: u128) -> WriteU128Le<&'a mut Self>where
Self: Unpin,
fn write_u128_le<'a>(&'a mut self, n: u128) -> WriteU128Le<&'a mut Self>where Self: Unpin,
Writes an unsigned 128-bit integer in little-endian order to the
underlying writer. Read more
source§fn write_i128_le<'a>(&'a mut self, n: i128) -> WriteI128Le<&'a mut Self>where
Self: Unpin,
fn write_i128_le<'a>(&'a mut self, n: i128) -> WriteI128Le<&'a mut Self>where Self: Unpin,
Writes an signed 128-bit integer in little-endian order to the
underlying writer. Read more
source§fn write_f32_le<'a>(&'a mut self, n: f32) -> WriteF32Le<&'a mut Self>where
Self: Unpin,
fn write_f32_le<'a>(&'a mut self, n: f32) -> WriteF32Le<&'a mut Self>where Self: Unpin,
Writes an 32-bit floating point type in little-endian order to the
underlying writer. Read more
source§fn write_f64_le<'a>(&'a mut self, n: f64) -> WriteF64Le<&'a mut Self>where
Self: Unpin,
fn write_f64_le<'a>(&'a mut self, n: f64) -> WriteF64Le<&'a mut Self>where Self: Unpin,
Writes an 64-bit floating point type in little-endian order to the
underlying writer. Read more
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more