信号就是软件中断，可以向正在执行的程序(进程)发送有关异步事件发生的信息。

Signals are software interrupts that send information about an occurrence of an asynchronous event to an executing program, or process.

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程序中的信号处理程序捕获到函数的执行被某个信号中断，信号处理程序然后按正常方式返回。

EINTR — the function was interrupted by a signal, which was caught by a signal handler in the program, and the signal handler returned normally.

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除了必要的模块包含及变量声明之外，信号中断捕捉程序被定义为允许输出每个数据运行的相关的头文件。

In addition to the necessary module includes and variable declarations, the signal-interrupt catcher is defined to allow the associated header for each data run to be printed out.

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