signal.go

package main

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

const fileName string = "/tmp/signal.out"

func main() {
	pid := os.Getpid()
	logMsg(fmt.Sprintf("pid: %d\n", pid))
	sigChan := make(chan os.Signal, 1)
	done := make(chan bool, 1)

	signal.Notify(sigChan, syscall.SIGTERM)

	go func() {
		<-sigChan
		logMsg(fmt.Sprintf("%d Received terminate signal\n", pid))
		done <- true
	}()

	logMsg(fmt.Sprintln("waiting on signal"))
	<-done
	logMsg(fmt.Sprintf("%d exiting\n", pid))
}

func logMsg(msg string) {
	file, err := os.OpenFile(fileName, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		log.Fatal(err)
	}

	_, err = file.WriteString(msg)
	if err != nil {
		log.Fatal(err)
	}

	err = file.Close()
	if err != nil {
		log.Fatal(err)
	}
}

This needs to be cross-compiled for linux as follows:

GOOS=linux GOARCH=amd64 CGO_ENABLED=1 go build signal.go