它将打印状态信息并将sleep命令发送给SIGINT信号。
It prints a status message and sends the sleep command a SIGINT signal.
如果子进程在父进程之前终止，则会向父进程发送一个信号，然后子进程转变为僵死状态，直到该信号得到确认，或父进程被终止。
If the child dies before the parent, a signal is sent to the parent, and then the child moves to a zombie state until the signal is acknowledged, or the parent process is killed.
一个信号可以在等待状态完成后，可以发送一个令牌来重新执行。
Signal can be send to a Token to resume execution after a wait state is finished.
第一帧(8位)数据发送完毕时，各控制信号均恢复原状态，只有TI保持高电平，呈中断申请状态。
The first frame (8) data sending finished, the control signal are restored the original state, only keep a high level, ti application state interruption.
第一帧(8位)数据发送完毕时，各控制信号均恢复原状态，只有TI保持高电平，呈中断申请状态。
The first frame (8) data sending finished, the control signal are restored the original state, only keep a high level, ti application state interruption.
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