run real job in subprocess

runInSubprocss.go

package main

import (
	"fmt"
	"os"
	"os/exec"
	"time"
)

func main() {
	fmt.Println(os.Getpid(), os.Getgid())
	mode := os.Getenv("TTT_RUN_MODE")
	if mode == "" {
		runMaster()
	} else if mode == "WORKER" {
		doJob()
	}
}

func doJob() {
	fmt.Println("do job")
	for {
		fmt.Println("aaaa", os.Getpid(), os.Getppid(), os.Getgid())
		time.Sleep(time.Second * 1)
	}
}

func runMaster() {
	for {
		fmt.Println("run master")
		name := os.Args[0]
		args := os.Args[1:len(os.Args)]
		cmd := exec.Command(name, args...)
		cmd.Stdin = os.Stdin
		cmd.Stderr = os.Stderr
		cmd.Stdout = os.Stdout
		cmd.Env = append(os.Environ(), "TTT_RUN_MODE=WORKER")
		if err := cmd.Run(); err != nil {
			fmt.Println(err)
		}
	}
}