Essential Books

OS Signals

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You can get notify about signals the os sends to your process.

For example, Ctrl-C sends SIGINT signal. Here's how to get notified about SIGINT signal: 

package main

import (
    "fmt"
    "os"
    "os/signal"
)

func main() {
    sigChan := make(chan os.Signal)

    // assign all signal notifications to the channel
    signal.Notify(sigChan)

    // blocks until you get a signal from the OS
    select {
    case sig := <-sigChan:
        fmt.Println("Received signal from OS:", sig)
    }
}

This program creates a channel, uses signal.Notify to tell Go runtime to send a message to the channel when the OS sends a signal to the process. 

$ go run signals.go
^CReceived signal from OS: interrupt

The ^C above is the keyboard command CTRL+C which sends the SIGINT signal.

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