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SIO_FLUSH behavior

When the SIO_FLUSH socket ioctl is used in a Windows environment (user space), I am confused as to what is going on. Does this mean: (1) completely discards the data from the TCP / IP send queue into the black hole, or (2) pushes the send data in turn through the connection until the buffer is empty, or (3) anything else? Thank!

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On Windows, you can never be sure. However, this (search for SIOFLUSH) says it is dropping the send queue associated with the socket. This is what I also expect when I use SIO_FLUSH



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