Monitor a process in golang

process.go

package main

import (	
	"log"
	"os/exec"
	"syscall"
	"time"
)

type Process struct {
	cmd *exec.Cmd
}

func main() {
	proc := &Process{cmd: nil}
	proc.cmd = nil

	go func() {
		proc.cmd = exec.Command("sleep", "1")
		err := proc.cmd.Start()
		if err != nil {
			log.Fatal(err)
			panic(-1)
		}
		proc.cmd.Wait()
	}()

	for proc.cmd == nil || proc.cmd.Process == nil || proc.cmd.Process.Signal(syscall.Signal(0)) == nil {
		log.Printf("Program is running")
		time.Sleep(time.Duration(100) * time.Millisecond)
	}

	if proc.cmd.ProcessState != nil {
		if status, ok := proc.cmd.ProcessState.Sys().(syscall.WaitStatus); ok {
			log.Printf("Program finished with %d\n", status.ExitStatus())
		}
	} else {
		log.Print("Program finished\n")
	}
}