There can be only one signal handler per signal per process active at any instant.

在任何瞬间，只能有一个信号处理程序处理一个活动进程的一个信号。

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The signal handler cannot be set.

无法设置信号处理程序。

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The call was interrupted by a signal handler.

函数调用被信号处理函数中断。

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The call was interrupted by a signal handler.

函数调用被信号处理函数中断。

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