Catching signals via signal.NotifyContext

main.go

package main

import (
	"context"
	"log"
	"os"
	"os/signal"
	"syscall"
	"time"
)

func main() {
	log.Print("setting NotifyContext up")

	go func() {
		signal := syscall.SIGKILL
		log.Printf("goroutine: preparing to send signal %s(%d) to myself", signal, signal)
		time.Sleep(2 * time.Second)
		p, err := os.FindProcess(os.Getpid())
		if err != nil {
			log.Fatal(err)
		}
		log.Printf("goroutine: kill %d %d", signal, os.Getpid())
		err = p.Signal(signal)
		if err != nil {
			log.Fatal(err)
		}
	}()

	ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM, syscall.SIGKILL)
	defer cancel()
	log.Print("<-ctx.Done()")
	<-ctx.Done()
	log.Print("context.Done")
}

go build && main

2022/03/02 09:33:10 setting NotifyContext up
2022/03/02 09:33:10 goroutine: preparing to send signal killed(9) to myself
2022/03/02 09:33:10 <-ctx.Done()
2022/03/02 09:33:12 goroutine: kill 9 2916
Killed

When any other signal is used on line 16 (syscall.SIGTERM), then context.Done is printed.

go build && ./main 
2022/03/02 09:37:05 setting NotifyContext up
2022/03/02 09:37:05 goroutine: preparing to send signal terminated(15) to myself
2022/03/02 09:37:05 <-ctx.Done()
2022/03/02 09:37:07 goroutine: kill 15 3773
2022/03/02 09:37:07 context.Done