func (mp *master) forkLoop() error {
	//loop, restart command
	for {
		if err := mp.fork(); err != nil {
			return err
		}
	}
}
func (mp *master) forkLoop() error {
	//loop, restart command
	for {
		if err := mp.fork(); err != nil {
			return err
		}
	}
}
//not a real fork