If the interrupt simulation status flag is set, return EBUSY.
如果设置了中断模拟状态标志，它就会返回EBUSY。
Set the interrupt simulation status flag to indicate that interrupt simulation is in progress.
设置中断模拟状态标志，通知中断模拟正在运行。
Set the interrupt simulation status flag to indicate that interrupt simulation is in progress.
设置中断模拟状态标志，通知中断模拟正在运行。
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