Interrupt sleep() function

How can开发者_如何学C I interrupt sleep() using a signal handler?

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From sleep() function man page:

The sleep() function suspends execution of the calling thread until either seconds seconds have elapsed or a signal is delivered to the thread and its action is to invoke a signal-catching function or to terminate the thread or process. System activity may lengthen the sleep by an indeterminate amount.

So, if a signal is send to the application, its execution is resumed from the instruction after the sleep call.