go systems signals handler

signals.go

package main

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

func sygnalsWait() {
	pid := os.Getpid()
	fmt.Printf("pid: %v", pid)

	SigChannel := make(chan os.Signal, 1)

	done := make(chan int, 1)

	// kill pid
	signal.Notify(SigChannel, syscall.SIGTERM)
	// kill -s USR1 pid
	signal.Notify(SigChannel, syscall.SIGUSR1)
	// kill -s USR2
	signal.Notify(SigChannel, syscall.SIGUSR2)

	go func() {
		for {
			s := <-SigChannel

			switch s {
			case syscall.SIGUSR1:
				fmt.Printf("\nReceived signal %v", s)
			case syscall.SIGUSR2:
				fmt.Printf("\nReceived signal %v", s)
			default:
				fmt.Printf("\nExiting %v after 3s", s)
				time.Sleep(3 * time.Second)
				done <- 0
			}

		}
	}()

	<-done
	return

}