函数调用被信号处理函数中断。
详细说明数据采集过程、信号处理函数调用顺序。
The data acquisition process and the calling sequence of signal disposal function are described in detail.
注意，条件函数并不是异步信号安全的，因此不能在信号处理函数中调用。
Note that condition functions are not asynchronously signal-safe and should not be called from a signal handler.
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