使用 chan 信号箱进行信号处理

在陈信号板条箱提供了解决方案使用多个信道来处理信号 OS，altough 这个箱子是实验和应使用小心。

从 BurntSushi / chan 信号中获取的示例。

#[macro_use]
extern crate chan;
extern crate chan_signal;

use chan_signal::Signal;

fn main() {
    // Signal gets a value when the OS sent a INT or TERM signal.
    let signal = chan_signal::notify(&[Signal::INT, Signal::TERM]);
    // When our work is complete, send a sentinel value on `sdone`.
    let (sdone, rdone) = chan::sync(0);
    // Run work.
    ::std::thread::spawn(move || run(sdone));

    // Wait for a signal or for work to be done.
    chan_select! {
        signal.recv() -> signal => {
            println!("received signal: {:?}", signal)
        },
        rdone.recv() => {
            println!("Program completed normally.");
        }
    }
}

fn run(_sdone: chan::Sender<()>) {
    println!("Running work for 5 seconds.");
    println!("Can you send a signal quickly enough?");
    // Do some work.
    ::std::thread::sleep_ms(5000);

    // _sdone gets dropped which closes the channel and causes `rdone`
    // to unblock.
}