Signals {.en}

信号 {.zh}

::: {.en} Sometimes we’d like our Go programs to intelligently handle Unix signals. For example, we might want a server to gracefully shutdown when it receives a SIGTERM, or a command-line tool to stop processing input if it receives a SIGINT. Here’s how to handle signals in Go with channels. :::

::: {.zh}

有时我们希望我们的Go程序能够智能地处理[Unix信号]（http://en.wikipedia.org/wiki/Unix_signal）。例如，我们可能希望服务器在收到`SIGTERM`时优雅地关闭，或者命令行工具如果收到`SIGINT`则停止处理输入。这是如何处理带有通道的Go中的信号。

:::

package main
import "fmt"
import "os"
import "os/signal"
import "syscall"
func main() {

::: {.en} Go signal notification works by sending os.Signal values on a channel. We’ll create a channel to receive these notifications (we’ll also make one to notify us when the program can exit). :::

::: {.zh}

通过在通道上发送os.Signal值来发送信号通知。我们将创建一个频道来接收这些通知（我们还会在程序退出时让我们加以通知）。

:::

    sigs := make(chan os.Signal, 1)
    done := make(chan bool, 1)

::: {.en} signal.Notify registers the given channel to receive notifications of the specified signals. :::

::: {.zh}

signal.Notify注册给定的通道以接收指定信号的通知。

:::

    signal.Notify(sigs, syscall.SIGINT, syscall.SIGTERM)

::: {.en} This goroutine executes a blocking receive for signals. When it gets one it’ll print it out and then notify the program that it can finish. :::

::: {.zh}

这个goroutine执行阻塞接收forsignals。当它得到一个它将打印出来然后通知程序它可以完成。

:::

    go func() {
        sig := <-sigs
        fmt.Println()
        fmt.Println(sig)
        done <- true
    }()

::: {.en} The program will wait here until it gets the expected signal (as indicated by the goroutine above sending a value on done) and then exit. :::

::: {.zh}

程序将在此处等待，直到它获得预期的信号（如上所述，在’done`上发送一个值的goroutine指示）然后退出。

:::

    fmt.Println("awaiting signal")
    <-done
    fmt.Println("exiting")
}

::: {.en} When we run this program it will block waiting for a signal. By typing ctrl-C (which the terminal shows as ^C) we can send a SIGINT signal, causing the program to print interrupt and then exit. :::

::: {.zh}

当我们运行这个程序时，它将阻止等待信号。通过键入ctrl-C（终端显示为^ C），我们可以发送SIGINT信号，使程序打印interrupt然后退出。

:::

$ go run signals.go
awaiting signal
^C
interrupt
exiting

go by example 中文文档

Signals - 信号

Signals {.en}

信号 {.zh}