To see what's going on in main() we can set a breakpoint at a particular line or on a function in the program code so gdb will interrupt execution when it is reached.

为了查看在 main() 中发生了什么情况，可以在程序代码中的某一特定行或函数中设置断点，这样 gdb 会在遇到断点时中断执行。

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If the flag is set it indicates that a fast interrupt was serviced and therefore only the program counter is unstacked.

如果该标志被设置指示快速的中断服务是与因此，只有程序计数器拆散。

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