Struct tokio::net::UnixListener

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pub struct UnixListener { /* private fields */ }
Expand description

A Unix socket which can accept connections from other Unix sockets.

You can accept a new connection by using the accept method.

A UnixListener can be turned into a Stream with UnixListenerStream.

§Errors

Note that accepting a connection can lead to various errors and not all of them are necessarily fatal ‒ for example having too many open file descriptors or the other side closing the connection while it waits in an accept queue. These would terminate the stream if not handled in any way.

§Examples

use tokio::net::UnixListener;

#[tokio::main]
async fn main() {
    let listener = UnixListener::bind("/path/to/the/socket").unwrap();
    loop {
        match listener.accept().await {
            Ok((stream, _addr)) => {
                println!("new client!");
            }
            Err(e) => { /* connection failed */ }
        }
    }
}

Implementations§

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impl UnixListener

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pub fn bind<P>(path: P) -> Result<UnixListener>
where P: AsRef<Path>,

Creates a new UnixListener bound to the specified path.

§Panics

This function panics if it is not called from within a runtime with IO enabled.

The runtime is usually set implicitly when this function is called from a future driven by a tokio runtime, otherwise runtime can be set explicitly with Runtime::enter function.

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pub fn from_std(listener: UnixListener) -> Result<UnixListener>

Creates new UnixListener from a std::os::unix::net::UnixListener .

This function is intended to be used to wrap a UnixListener from the standard library in the Tokio equivalent.

§Notes

The caller is responsible for ensuring that the listener is in non-blocking mode. Otherwise all I/O operations on the listener will block the thread, which will cause unexpected behavior. Non-blocking mode can be set using set_nonblocking.

§Examples
use tokio::net::UnixListener;
use std::os::unix::net::UnixListener as StdUnixListener;

let std_listener = StdUnixListener::bind("/path/to/the/socket")?;
std_listener.set_nonblocking(true)?;
let listener = UnixListener::from_std(std_listener)?;
§Panics

This function panics if it is not called from within a runtime with IO enabled.

The runtime is usually set implicitly when this function is called from a future driven by a tokio runtime, otherwise runtime can be set explicitly with Runtime::enter function.

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pub fn into_std(self) -> Result<UnixListener>

Turns a tokio::net::UnixListener into a std::os::unix::net::UnixListener.

The returned std::os::unix::net::UnixListener will have nonblocking mode set as true. Use set_nonblocking to change the blocking mode if needed.

§Examples
let tokio_listener = tokio::net::UnixListener::bind("/path/to/the/socket")?;
let std_listener = tokio_listener.into_std()?;
std_listener.set_nonblocking(false)?;
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pub fn local_addr(&self) -> Result<SocketAddr>

Returns the local socket address of this listener.

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pub fn take_error(&self) -> Result<Option<Error>>

Returns the value of the SO_ERROR option.

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pub async fn accept(&self) -> Result<(UnixStream, SocketAddr)>

Accepts a new incoming connection to this listener.

§Cancel safety

This method is cancel safe. If the method is used as the event in a tokio::select! statement and some other branch completes first, then it is guaranteed that no new connections were accepted by this method.

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pub fn poll_accept( &self, cx: &mut Context<'_> ) -> Poll<Result<(UnixStream, SocketAddr)>>

Polls to accept a new incoming connection to this listener.

If there is no connection to accept, Poll::Pending is returned and the current task will be notified by a waker. Note that on multiple calls to poll_accept, only the Waker from the Context passed to the most recent call is scheduled to receive a wakeup.

Trait Implementations§

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impl AsFd for UnixListener

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

Borrows the file descriptor. Read more
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impl AsRawFd for UnixListener

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fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor. Read more
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impl Debug for UnixListener

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

Formats the value using the given formatter. Read more
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impl TryFrom<UnixListener> for UnixListener

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fn try_from(stream: UnixListener) -> Result<Self>

Consumes stream, returning the tokio I/O object.

This is equivalent to UnixListener::from_std(stream).

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type Error = Error

The type returned in the event of a conversion error.

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.