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Alex Crichton
2018-09-10 11:29:50 -07:00
committed by Carl Lerche
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.gitignore
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target
Cargo.lock
.travis.yml
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language: rust
rust:
- stable
- beta
- nightly
sudo: false
before_script:
- pip install 'travis-cargo<0.2' --user && export PATH=$HOME/.local/bin:$PATH
script:
- cargo build
- cargo test
- cargo doc --no-deps
after_success:
- travis-cargo --only nightly doc-upload
env:
global:
- secure: 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
notifications:
email:
on_success: never
os:
- linux
- osx
Cargo.toml
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[package]
name = "tokio-signal"
version = "0.1.0"
authors = ["Alex Crichton <[email protected]>"]
license = "MIT/Apache-2.0"
repository = "https://github.com/alexcrichton/tokio-signal"
homepage = "https://github.com/alexcrichton/tokio-signal"
documentation = "https://alexcrichton.github.io/tokio-signal"
description = """
An implementation of an asynchronous Unix signal handling backed futures.
"""
[dependencies]
tokio-core = { git = "https://github.com/tokio-rs/tokio-core" }
futures = { git = "https://github.com/alexcrichton/futures-rs" }
[target.'cfg(unix)'.dependencies]
tokio-uds = { git = "https://github.com/tokio-rs/tokio-uds" }
libc = "0.2"
mio = "0.6"
LICENSE-APACHE
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LICENSE-MIT
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Copyright (c) 2016 Alex Crichton
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README.md
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# tokio-signal
An implementation of Unix signal handling for Tokio
[![Build Status](https://travis-ci.org/alexcrichton/tokio-signal.svg?branch=master)](https://travis-ci.org/alexcrichton/tokio-signal)
[Documentation](https://alexcrichton.github.io/tokio-signal)
## Usage
First, add this to your `Cargo.toml`:
```toml
[dependencies]
tokio-signal = { git = "https://github.com/alexcrichton/tokio-signal" }
```
Next, add this to your crate:
```rust
extern crate tokio_signal;
```
# License
`tokio-signal` is primarily distributed under the terms of both the MIT
license and the Apache License (Version 2.0), with portions covered by various
BSD-like licenses.
See LICENSE-APACHE, and LICENSE-MIT for details.
src/lib.rs
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//! Asynchronous signal handling for Tokio
//!
//! This crate implements asynchronous signal handling for Tokio, and
//! asynchronous I/O framework in Rust. The primary type exported from this
//! crate, `unix::Signal`, allows listening for arbitrary signals on Unix
//! platforms, receiving them in an asynchronous fashion.
//!
//! Note that signal handling is in general a very tricky topic and should be
//! used with great care. This crate attempts to implement 'best practice' for
//! signal handling, but it should be evaluated for your own applications' needs
//! to see if it's suitable.
//!
//! The are some fundamental limitations of this crate documented on the
//! `Signal` structure as well.
//!
//! > **Note**: This crate compiles on Windows, but currently contains no
//! > bindings. Windows does not have signals like Unix does, but it
//! > does have a way to receive ctrl-c notifications at the console.
//! > It's planned that this will be bound and exported outside the
//! > `unix` module in the future!
#![deny(missing_docs)]
#[macro_use]
extern crate futures;
extern crate tokio_core;
pub mod unix;
src/unix.rs
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//! Unix-specific types for signal handling.
//!
//! This module is only defined on Unix platforms and contains the primary
//! `Signal` type for receiving notifications of signals.
#![cfg(unix)]
extern crate libc;
extern crate mio;
extern crate tokio_uds;
use std::cell::RefCell;
use std::io::{self, Write, Read};
use std::mem;
use std::sync::atomic::{AtomicBool, Ordering};
use std::sync::{Once, ONCE_INIT, Mutex};
use futures::stream::{Stream, Fuse};
use futures::{self, Future, Complete, Oneshot, Poll, Async};
use self::libc::c_int;
use self::tokio_uds::UnixStream;
use tokio_core::io::IoFuture;
use tokio_core::{LoopHandle, Sender, Receiver, ReadinessStream};
static INIT: Once = ONCE_INIT;
static mut GLOBAL_STATE: *mut GlobalState = 0 as *mut _;
/// An implementation of `Stream` for receiving a particular type of signal.
///
/// This structure implements the `Stream` trait and represents notifications
/// of the current process receiving a particular signal. The signal being
/// listened for is passed to `Signal::new`, and the same signal number is then
/// yielded as each element for the stream.
///
/// In general signal handling on Unix is a pretty tricky topic, and this
/// structure is no exception! There are some important limitations to keep in
/// mind when using `Signal` streams:
///
/// * While multiple event loops are supported, the *first* event loop to
/// register a signal handler is required to be active to ensure that signals
/// for other event loops are delivered. In other words, once an event loop
/// registers a signal, it's best to keep it around and running. This is
/// normally just a problem for tests, and the "workaround" is to spawn a
/// thread in the background at the beginning of the test suite which is
/// running an event loop (and listening for a signal).
///
/// * Signals handling in Unix already necessitates coalescing signals
/// together sometimes. This `Signal` stream is also no exception here in
/// that it will also coalesce signals. That is, even if the signal handler
/// for this process runs multiple times, the `Signal` stream may only return
/// one signal notification. Specifically, before `poll` is called, all
/// signal notifications are coalesced into one item returned from `poll`.
/// Once `poll` has been called, however, a further signal is guaranteed to
/// be yielded as an item.
///
/// * Signal handling in general is relatively inefficient. Although some
/// improvements are possible in this crate, it's recommended to not plan on
/// having millions of signal channels open.
///
/// * Currently the "driver task" to process incoming signals never exits.
///
/// If you've got any questions about this feel free to open an issue on the
/// repo, though, as I'd love to chat about this! In other words, I'd love to
/// alleviate some of these limitations if possible!
pub struct Signal {
signum: c_int,
reg: ReadinessStream<MyRegistration>,
_finished: Complete<()>,
}
struct GlobalState {
write: UnixStream,
tx: Mutex<Sender<Message>>,
signals: [GlobalSignalState; 32],
}
struct GlobalSignalState {
ready: AtomicBool,
prev: libc::sigaction,
}
enum Message {
NewSignal(c_int, Complete<io::Result<Signal>>),
}
struct DriverTask {
handle: LoopHandle,
read: UnixStream,
rx: Fuse<Receiver<Message>>,
signals: [SignalState; 32],
}
struct SignalState {
registered: bool,
tasks: Vec<(RefCell<Oneshot<()>>, mio::SetReadiness)>,
}
impl Signal {
/// Creates a new stream which will receive notifications when the current
/// process receives the signal `signum`.
///
/// This function will create a new stream which may be based on the
/// event loop handle provided. This function returns a future which will
/// then resolve to the signal stream, if successful.
///
/// The `Signal` stream is an infinite stream which will receive
/// notifications whenever a signal is received. More documentation can be
/// found on `Signal` itself, but to reiterate:
///
/// * Signals may be coalesced beyond what the kernel already does.
/// * While multiple event loops are supported, the first event loop to
/// register a signal handler must be active to deliver signal
/// notifications
/// * Once a signal handle is registered with the process the underlying
/// libc signal handler is never unregistered.
///
/// A `Signal` stream can be created for a particular signal number
/// multiple times. When a signal is received then all the associated
/// channels will receive the signal notification.
pub fn new(signum: c_int, handle: &LoopHandle) -> IoFuture<Signal> {
let mut init = None;
INIT.call_once(|| {
init = Some(global_init(handle));
});
let new_signal = futures::lazy(move || {
let (tx, rx) = futures::oneshot();
let msg = Message::NewSignal(signum, tx);
let res = unsafe {
(*GLOBAL_STATE).tx.lock().unwrap().send(msg)
};
res.expect("failed to request a new signal stream, did the \
first event loop go away?");
rx.then(|r| r.unwrap())
});
match init {
Some(init) => init.and_then(|()| new_signal).boxed(),
None => new_signal.boxed(),
}
}
}
impl Stream for Signal {
type Item = c_int;
type Error = io::Error;
fn poll(&mut self) -> Poll<Option<c_int>, io::Error> {
try_ready!(self.reg.poll_read());
self.reg.get_ref()
.inner.borrow()
.as_ref().unwrap().1
.set_readiness(mio::Ready::none())
.expect("failed to set readiness");
Ok(Async::Ready(Some(self.signum)))
}
}
fn global_init(handle: &LoopHandle) -> IoFuture<()> {
let handle = handle.clone();
let (tx, rx) = handle.clone().channel();
let io = rx.join(UnixStream::pair(handle.clone()));
io.map(move |(rx, (read, write))| {
unsafe {
let state = Box::new(GlobalState {
write: write,
signals: {
fn new() -> GlobalSignalState {
GlobalSignalState {
ready: AtomicBool::new(false),
prev: unsafe { mem::zeroed() },
}
}
[
new(), new(), new(), new(), new(), new(), new(), new(),
new(), new(), new(), new(), new(), new(), new(), new(),
new(), new(), new(), new(), new(), new(), new(), new(),
new(), new(), new(), new(), new(), new(), new(), new(),
]
},
tx: Mutex::new(tx.clone()),
});
GLOBAL_STATE = Box::into_raw(state);
handle.clone().spawn(|_| {
DriverTask {
handle: handle,
rx: rx.fuse(),
read: read,
signals: {
fn new() -> SignalState {
SignalState { registered: false, tasks: Vec::new() }
}
[
new(), new(), new(), new(), new(), new(), new(), new(),
new(), new(), new(), new(), new(), new(), new(), new(),
new(), new(), new(), new(), new(), new(), new(), new(),
new(), new(), new(), new(), new(), new(), new(), new(),
]
},
}
});
}
}).boxed()
}
impl Future for DriverTask {
type Item = ();
type Error = ();
fn poll(&mut self) -> Poll<(), ()> {
self.check_signal_drops();
self.check_messages();
self.check_signals();
// TODO: when to finish this task?
Ok(Async::NotReady)
}
}
impl DriverTask {
fn check_signal_drops(&mut self) {
for signal in self.signals.iter_mut() {
signal.tasks.retain(|task| {
!task.0.borrow_mut().poll().is_err()
});
}
}
fn check_messages(&mut self) {
loop {
// Acquire the next message
let message = match self.rx.poll() {
Ok(Async::Ready(Some(e))) => e,
Ok(Async::Ready(None)) |
Ok(Async::NotReady) => break,
Err(e) => panic!("error on rx: {}", e),
};
let (sig, complete) = match message {
Message::NewSignal(sig, complete) => (sig, complete),
};
// If the signal's too large, then we return an error, otherwise we
// use this index to look at the signal slot.
//
// If the signal wasn't previously registered then we do so now.
let signal = match self.signals.get_mut(sig as usize) {
Some(signal) => signal,
None => {
complete.complete(Err(io::Error::new(io::ErrorKind::Other,
"signum too large")));
continue
}
};
if !signal.registered {
unsafe {
let mut new: libc::sigaction = mem::zeroed();
new.sa_sigaction = handler as usize;
new.sa_flags = libc::SA_RESTART | libc::SA_SIGINFO;
let mut prev = mem::zeroed();
if libc::sigaction(sig, &new, &mut prev) != 0 {
complete.complete(Err(io::Error::last_os_error()));
continue
}
signal.registered = true;
}
}
// Acquire the (registration, set_readiness) pair by... assuming
// we're on the event loop (true because of the spawn above).
let reg = MyRegistration { inner: RefCell::new(None) };
let mut new = ReadinessStream::new(self.handle.clone(), reg);
let reg = match new.poll() {
Ok(Async::Ready(reg)) => reg,
Ok(Async::NotReady) => panic!("should be on event loop"),
Err(e) => {
complete.complete(Err(e));
continue
}
};
// Create the `Signal` to pass back and then also keep a handle to
// the `SetReadiness` for ourselves internally.
let (tx, rx) = futures::oneshot();
let ready = reg.get_ref().inner.borrow_mut().as_mut().unwrap().1.clone();
complete.complete(Ok(Signal {
signum: sig,
reg: reg,
_finished: tx,
}));
signal.tasks.push((RefCell::new(rx), ready));
}
}
fn check_signals(&mut self) {
// Drain all data from the pipe
let mut buf = [0; 32];
let mut any = false;
loop {
match self.read.read(&mut buf) {
Ok(0) => { // EOF == something happened
any = true;
break
}
Ok(..) => any = true, // data read, but keep draining
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => break,
Err(e) => panic!("bad read: {}", e),
}
}
// If nothing happened, no need to check the signals
if !any {
return
}
for (i, slot) in self.signals.iter().enumerate() {
// No need to go farther if we haven't even registered a signal
if !slot.registered {
continue
}
// See if this signal actually happened since we last checked
unsafe {
if !(*GLOBAL_STATE).signals[i].ready.swap(false, Ordering::SeqCst) {
continue
}
}
// Wake up all the tasks waiting on this signal
for task in slot.tasks.iter() {
task.1.set_readiness(mio::Ready::readable())
.expect("failed to set readiness");
}
}
}
}
extern fn handler(signum: c_int,
info: *mut libc::siginfo_t,
ptr: *mut libc::c_void) {
type FnSigaction = extern fn(c_int, *mut libc::siginfo_t, *mut libc::c_void);
type FnHandler = extern fn(c_int);
unsafe {
let state = match (*GLOBAL_STATE).signals.get(signum as usize) {
Some(state) => state,
None => return,
};
if !state.ready.swap(true, Ordering::SeqCst) {
match (&(*GLOBAL_STATE).write).write(&[1]) {
Ok(..) => {}
Err(e) => {
if e.kind() != io::ErrorKind::WouldBlock {
panic!("bad error on write fd: {}", e)
}
}
}
}
let fnptr = state.prev.sa_sigaction;
if fnptr == 0 || fnptr == libc::SIG_DFL || fnptr == libc::SIG_IGN {
return
}
if state.prev.sa_flags & libc::SA_SIGINFO == 0 {
let action = mem::transmute::<usize, FnHandler>(fnptr);
action(signum)
} else {
let action = mem::transmute::<usize, FnSigaction>(fnptr);
action(signum, info, ptr)
}
}
}
struct MyRegistration {
inner: RefCell<Option<(mio::Registration, mio::SetReadiness)>>,
}
impl mio::Evented for MyRegistration {
fn register(&self,
poll: &mio::Poll,
token: mio::Token,
events: mio::Ready,
opts: mio::PollOpt) -> io::Result<()> {
let reg = mio::Registration::new(poll, token, events, opts);
*self.inner.borrow_mut() = Some(reg);
Ok(())
}
fn reregister(&self,
_poll: &mio::Poll,
_token: mio::Token,
_events: mio::Ready,
_opts: mio::PollOpt) -> io::Result<()> {
Ok(())
}
fn deregister(&self, _poll: &mio::Poll) -> io::Result<()> {
Ok(())
}
}
tests/signal.rs
+97
View File
@@ -0,0 +1,97 @@
#![cfg(unix)]
extern crate futures;
extern crate libc;
extern crate tokio_core;
extern crate tokio_signal;
use std::sync::mpsc::channel;
use std::sync::{Once, ONCE_INIT, Mutex, MutexGuard};
use std::thread;
use std::time::Duration;
use futures::Future;
use futures::stream::Stream;
use tokio_core::Loop;
use tokio_signal::unix::Signal;
static INIT: Once = ONCE_INIT;
static mut LOCK: *mut Mutex<()> = 0 as *mut _;
fn lock() -> MutexGuard<'static, ()> {
unsafe {
INIT.call_once(|| {
LOCK = Box::into_raw(Box::new(Mutex::new(())));
let (tx, rx) = channel();
thread::spawn(move || {
let mut lp = Loop::new().unwrap();
let handle = lp.handle();
let _signal = lp.run(Signal::new(libc::SIGALRM, &handle)).unwrap();
tx.send(()).unwrap();
drop(lp.run(futures::empty::<(), ()>()));
});
rx.recv().unwrap();
});
(*LOCK).lock().unwrap()
}
}
#[test]
fn simple() {
let _lock = lock();
let mut lp = Loop::new().unwrap();
let handle = lp.handle();
let signal = lp.run(Signal::new(libc::SIGUSR1, &handle)).unwrap();
unsafe {
assert_eq!(libc::kill(libc::getpid(), libc::SIGUSR1), 0);
}
lp.run(signal.into_future()).ok().unwrap();
}
#[test]
fn notify_both() {
let _lock = lock();
let mut lp = Loop::new().unwrap();
let handle = lp.handle();
let signal1 = lp.run(Signal::new(libc::SIGUSR2, &handle)).unwrap();
let signal2 = lp.run(Signal::new(libc::SIGUSR2, &handle)).unwrap();
unsafe {
assert_eq!(libc::kill(libc::getpid(), libc::SIGUSR2), 0);
}
lp.run(signal1.into_future().join(signal2.into_future())).ok().unwrap();
}
#[test]
fn drop_then_get_a_signal() {
let _lock = lock();
let mut lp = Loop::new().unwrap();
let handle = lp.handle();
let signal = lp.run(Signal::new(libc::SIGUSR1, &handle)).unwrap();
drop(signal);
unsafe {
assert_eq!(libc::kill(libc::getpid(), libc::SIGUSR1), 0);
}
let timeout = lp.handle().timeout(Duration::from_millis(1));
lp.run(timeout.and_then(|t| t)).unwrap();
}
#[test]
fn twice() {
let _lock = lock();
let mut lp = Loop::new().unwrap();
let handle = lp.handle();
let signal = lp.run(Signal::new(libc::SIGUSR1, &handle)).unwrap();
unsafe {
assert_eq!(libc::kill(libc::getpid(), libc::SIGUSR1), 0);
}
let (num, signal) = lp.run(signal.into_future()).ok().unwrap();
assert_eq!(num, Some(libc::SIGUSR1));
unsafe {
assert_eq!(libc::kill(libc::getpid(), libc::SIGUSR1), 0);
}
lp.run(signal.into_future()).ok().unwrap();
}