restart or shutdown golang apps programmatically

so i need to make a program than can run, then restart or shutdown programmatically. I need to do like this from terminal:

project> go run app.go
apps started, waiting for 5 sec...
project>

other scenario:

project> go run app.go runner.go
apps started from app.go
runner detecting app.go from runner.go
app restarted after 10 sec from app.go

The program will be something like below:

package main

import(
    "something"
)
func main () {
    something.KillPrograms({
        doingWhatever() //my program here
   }, 5000) //program will running for only 5 sec
}

any library or anything from golang can do like that? thanks.

You can try with time.Sleep

package main

import (
    "fmt"
    "time"
)

func main() {
    //use goroutine to run your function separately
    //if you want it's sync, you can remove `go`
    go doingWhatever()

    //after 5 seconds, the program will exit 
    //even though your function has not been done yet
    time.Sleep(5 * time.Second)

    os.Exit(0)
}

Many libraries can handle restart/watch of the program. check this answer or this one.

I just tried this simple code that will restart itself each 2 seconds and during that he will run a random check to shutdown.

package main

import (
	"fmt"
	"math/rand"
	"os"
	"os/exec"
	"runtime"
	"sync"
	"syscall"
	"time"
)

var wg sync.WaitGroup

func main() {
	t1 := time.NewTimer(time.Second * 2)
	wg.Add(1)

	// you can handle to restart programmatically
	go func() {
		defer wg.Done()
		<-t1.C
		fmt.Println("Timer expired")
		RestartSelf()
	}()

	fmt.Println(time.Now().Format("2006-Jan-02 ( 15:04:05)"))
	rand.Seed(time.Now().UnixNano())
	// you can handle the shut-down programmatically
	if rand.Intn(3) == 1 {
		fmt.Println("It is time to shut-down")
		os.Exit(0)
	}
	wg.Wait()

}
func RestartSelf() error {
	self, err := os.Executable()
	if err != nil {
		return err
	}
	args := os.Args
	env := os.Environ()
	// Windows does not support exec syscall.
	if runtime.GOOS == "windows" {
		cmd := exec.Command(self, args[1:]...)
		cmd.Stdout = os.Stdout
		cmd.Stderr = os.Stderr
		cmd.Stdin = os.Stdin
		cmd.Env = env
		err := cmd.Run()
		if err == nil {
			os.Exit(0)
		}
		return err
	}
	return syscall.Exec(self, args, env)
}

output

2022-Mar-10 ( 17:59:53)
Timer expired
2022-Mar-10 ( 17:59:55)
Timer expired
2022-Mar-10 ( 17:59:57)
It is time to shut-down
Process finished with the exit code 0