Listening for signal termination in Golang (AKA shutdown hook)

main.go

package main

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

// Program that will listen to the SIGINT and SIGTERM
// SIGINT will listen to CTRL-C.
// SIGTERM will be caught if kill command executed.
//
// See:
// - https://en.wikipedia.org/wiki/Unix_signal
// - https://www.quora.com/What-is-the-difference-between-the-SIGINT-and-SIGTERM-signals-in-Linux
// - http://programmergamer.blogspot.co.id/2013/05/clarification-on-sigint-sigterm-sigkill.html
func main() {
	done := make(chan struct{})

	go func() {
		log.Println("Listening signals...")
		c := make(chan os.Signal, 1) // we need to reserve to buffer size 1, so the notifier are not blocked
		signal.Notify(c, os.Interrupt, syscall.SIGTERM)
		
		<-c
		close(done)
	}()

	<-done
	log.Println("Done")
}

Hi, I have a question. What is the best way to signal shutdown by other goroutines?
Also if multiple goroutines signal shutdown at the same time, would some of them they be blocked since the channel c only has capacity of 1?

Need more detail on what you want to do here. But I suggest to use https://github.com/oklog/run

Those signals are from OS. One goroutine to listen is enough.

Hi, I have a question. What is the best way to signal shutdown by other goroutines?
Also if multiple goroutines signal shutdown at the same time, would some of them they be blocked since the channel c only has capacity of 1?

I think that would be use of context.Context