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Feature: Add more windows signal handlers (#4924)
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@jkelleyrtp
jkelleyrtp authored Aug 31, 2022
1 parent 5a2bc85 commit adc774b
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302 changes: 298 additions & 4 deletions tokio/src/signal/windows.rs
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@@ -1,9 +1,9 @@
//! Windows-specific types for signal handling.
//!
//! This module is only defined on Windows and allows receiving "ctrl-c"
//! and "ctrl-break" notifications. These events are listened for via the
//! `SetConsoleCtrlHandler` function which receives events of the type
//! `CTRL_C_EVENT` and `CTRL_BREAK_EVENT`.
//! This module is only defined on Windows and allows receiving "ctrl-c",
//! "ctrl-break", "ctrl-logoff", "ctrl-shutdown", and "ctrl-close"
//! notifications. These events are listened for via the `SetConsoleCtrlHandler`
//! function which receives the corresponding winapi event type.
#![cfg(any(windows, docsrs))]
#![cfg_attr(docsrs, doc(cfg(all(windows, feature = "signal"))))]
Expand Down Expand Up @@ -221,3 +221,297 @@ pub fn ctrl_break() -> io::Result<CtrlBreak> {
inner: self::imp::ctrl_break()?,
})
}

/// Creates a new stream which receives "ctrl-close" notifications sent to the
/// process.
///
/// # Examples
///
/// ```rust,no_run
/// use tokio::signal::windows::ctrl_close;
///
/// #[tokio::main]
/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
/// // An infinite stream of CTRL-CLOSE events.
/// let mut stream = ctrl_close()?;
///
/// // Print whenever a CTRL-CLOSE event is received.
/// for countdown in (0..3).rev() {
/// stream.recv().await;
/// println!("got CTRL-CLOSE. {} more to exit", countdown);
/// }
///
/// Ok(())
/// }
/// ```
pub fn ctrl_close() -> io::Result<CtrlClose> {
Ok(CtrlClose {
inner: self::imp::ctrl_close()?,
})
}

/// Represents a stream which receives "ctrl-close" notitifications sent to the process
/// via 'SetConsoleCtrlHandler'.
///
/// A notification to this process notifies *all* streams listening for
/// this event. Moreover, the notifications **are coalesced** if they aren't processed
/// quickly enough. This means that if two notifications are received back-to-back,
/// then the stream may only receive one item about the two notifications.
#[must_use = "streams do nothing unless polled"]
#[derive(Debug)]
pub struct CtrlClose {
inner: RxFuture,
}

impl CtrlClose {
/// Receives the next signal notification event.
///
/// `None` is returned if no more events can be received by this stream.
///
/// # Examples
///
/// ```rust,no_run
/// use tokio::signal::windows::ctrl_close;
///
/// #[tokio::main]
/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
/// // An infinite stream of CTRL-CLOSE events.
/// let mut stream = ctrl_close()?;
///
/// // Print whenever a CTRL-CLOSE event is received.
/// stream.recv().await;
/// println!("got CTRL-CLOSE. Cleaning up before exiting");
///
/// Ok(())
/// }
/// ```
pub async fn recv(&mut self) -> Option<()> {
self.inner.recv().await
}

/// Polls to receive the next signal notification event, outside of an
/// `async` context.
///
/// `None` is returned if no more events can be received by this stream.
///
/// # Examples
///
/// Polling from a manually implemented future
///
/// ```rust,no_run
/// use std::pin::Pin;
/// use std::future::Future;
/// use std::task::{Context, Poll};
/// use tokio::signal::windows::CtrlClose;
///
/// struct MyFuture {
/// ctrl_close: CtrlClose,
/// }
///
/// impl Future for MyFuture {
/// type Output = Option<()>;
///
/// fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
/// println!("polling MyFuture");
/// self.ctrl_close.poll_recv(cx)
/// }
/// }
/// ```
pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>> {
self.inner.poll_recv(cx)
}
}

/// Creates a new stream which receives "ctrl-shutdown" notifications sent to the
/// process.
///
/// # Examples
///
/// ```rust,no_run
/// use tokio::signal::windows::ctrl_shutdown;
///
/// #[tokio::main]
/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
/// // An infinite stream of CTRL-SHUTDOWN events.
/// let mut stream = ctrl_shutdown()?;
///
/// stream.recv().await;
/// println!("got CTRL-SHUTDOWN. Cleaning up before exiting");
///
/// Ok(())
/// }
/// ```
pub fn ctrl_shutdown() -> io::Result<CtrlShutdown> {
Ok(CtrlShutdown {
inner: self::imp::ctrl_shutdown()?,
})
}

/// Represents a stream which receives "ctrl-shutdown" notitifications sent to the process
/// via 'SetConsoleCtrlHandler'.
///
/// A notification to this process notifies *all* streams listening for
/// this event. Moreover, the notifications **are coalesced** if they aren't processed
/// quickly enough. This means that if two notifications are received back-to-back,
/// then the stream may only receive one item about the two notifications.
#[must_use = "streams do nothing unless polled"]
#[derive(Debug)]
pub struct CtrlShutdown {
inner: RxFuture,
}

impl CtrlShutdown {
/// Receives the next signal notification event.
///
/// `None` is returned if no more events can be received by this stream.
///
/// # Examples
///
/// ```rust,no_run
/// use tokio::signal::windows::ctrl_shutdown;
///
/// #[tokio::main]
/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
/// // An infinite stream of CTRL-SHUTDOWN events.
/// let mut stream = ctrl_shutdown()?;
///
/// // Print whenever a CTRL-SHUTDOWN event is received.
/// stream.recv().await;
/// println!("got CTRL-SHUTDOWN. Cleaning up before exiting");
///
/// Ok(())
/// }
/// ```
pub async fn recv(&mut self) -> Option<()> {
self.inner.recv().await
}

/// Polls to receive the next signal notification event, outside of an
/// `async` context.
///
/// `None` is returned if no more events can be received by this stream.
///
/// # Examples
///
/// Polling from a manually implemented future
///
/// ```rust,no_run
/// use std::pin::Pin;
/// use std::future::Future;
/// use std::task::{Context, Poll};
/// use tokio::signal::windows::CtrlShutdown;
///
/// struct MyFuture {
/// ctrl_shutdown: CtrlShutdown,
/// }
///
/// impl Future for MyFuture {
/// type Output = Option<()>;
///
/// fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
/// println!("polling MyFuture");
/// self.ctrl_shutdown.poll_recv(cx)
/// }
/// }
/// ```
pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>> {
self.inner.poll_recv(cx)
}
}

/// Creates a new stream which receives "ctrl-logoff" notifications sent to the
/// process.
///
/// # Examples
///
/// ```rust,no_run
/// use tokio::signal::windows::ctrl_logoff;
///
/// #[tokio::main]
/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
/// // An infinite stream of CTRL-LOGOFF events.
/// let mut stream = ctrl_logoff()?;
///
/// stream.recv().await;
/// println!("got CTRL-LOGOFF. Cleaning up before exiting");
///
/// Ok(())
/// }
/// ```
pub fn ctrl_logoff() -> io::Result<CtrlLogoff> {
Ok(CtrlLogoff {
inner: self::imp::ctrl_logoff()?,
})
}

/// Represents a stream which receives "ctrl-logoff" notitifications sent to the process
/// via 'SetConsoleCtrlHandler'.
///
/// A notification to this process notifies *all* streams listening for
/// this event. Moreover, the notifications **are coalesced** if they aren't processed
/// quickly enough. This means that if two notifications are received back-to-back,
/// then the stream may only receive one item about the two notifications.
#[must_use = "streams do nothing unless polled"]
#[derive(Debug)]
pub struct CtrlLogoff {
inner: RxFuture,
}

impl CtrlLogoff {
/// Receives the next signal notification event.
///
/// `None` is returned if no more events can be received by this stream.
///
/// # Examples
///
/// ```rust,no_run
/// use tokio::signal::windows::ctrl_logoff;
///
/// #[tokio::main]
/// async fn main() -> Result<(), Box<dyn std::error::Error>> {
/// // An infinite stream of CTRL-LOGOFF events.
/// let mut stream = ctrl_logoff()?;
///
/// // Print whenever a CTRL-LOGOFF event is received.
/// stream.recv().await;
/// println!("got CTRL-LOGOFF. Cleaning up before exiting");
///
/// Ok(())
/// }
/// ```
pub async fn recv(&mut self) -> Option<()> {
self.inner.recv().await
}

/// Polls to receive the next signal notification event, outside of an
/// `async` context.
///
/// `None` is returned if no more events can be received by this stream.
///
/// # Examples
///
/// Polling from a manually implemented future
///
/// ```rust,no_run
/// use std::pin::Pin;
/// use std::future::Future;
/// use std::task::{Context, Poll};
/// use tokio::signal::windows::CtrlLogoff;
///
/// struct MyFuture {
/// ctrl_logoff: CtrlLogoff,
/// }
///
/// impl Future for MyFuture {
/// type Output = Option<()>;
///
/// fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
/// println!("polling MyFuture");
/// self.ctrl_logoff.poll_recv(cx)
/// }
/// }
/// ```
pub fn poll_recv(&mut self, cx: &mut Context<'_>) -> Poll<Option<()>> {
self.inner.poll_recv(cx)
}
}
14 changes: 13 additions & 1 deletion tokio/src/signal/windows/stub.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -4,10 +4,22 @@
use crate::signal::RxFuture;
use std::io;

pub(super) fn ctrl_break() -> io::Result<RxFuture> {
panic!()
}

pub(super) fn ctrl_close() -> io::Result<RxFuture> {
panic!()
}

pub(super) fn ctrl_c() -> io::Result<RxFuture> {
panic!()
}

pub(super) fn ctrl_break() -> io::Result<RxFuture> {
pub(super) fn ctrl_logoff() -> io::Result<RxFuture> {
panic!()
}

pub(super) fn ctrl_shutdown() -> io::Result<RxFuture> {
panic!()
}
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