linux进程间通信，父进程，子进程的创建-inter-process communication, parent process, the process of creating son

模拟银行排队机系统，父进程负责调度，子进程负责接收顾客、打印顾客号、呼叫顾客到相应窗口和服务顾客。-Simulation Bank Queue System, the parent process is responsible for scheduling, sub-process is responsible for receiving clients, print customer number, call customer to the appropriate window and cus