code: func _pidAlive(pid int) bool {
  	proc, err := os.FindProcess(pid)
  	if err == nil {
  		err = proc.Signal(syscall.Signal(0))
  	}
  
  	return err == nil
  }
docs: // _pidAlive tests whether a process is alive or not by sending it Signal 0,
  // since Go otherwise has no way to test this.