How to know a socket is blocking mode or not? On Windows [duplicate]

This question already has answers here: Closed 10 years ago.

Possible Duplicate:

In W开发者_开发技巧in32, is there a way to test if a socket is non-blocking?

On Unix, I can use fcntl().

Are there any Winsock API I can use to check a socket is blocking mode or not?

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Winsock unfortunately (and surprisingly) isn't able to do this.