C++ : TCP sockets: Where does incoming data go after ack(leaves tcp read buffer) but before read()/r

C++ : TCP sockets: Where does incoming data go after ack(leaves tcp read buffer) but before read()/recv()?
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C++ : TCP sockets: Where does incoming data go after ack(leaves tcp read buffer) but before read()/recv()?
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read()/recv()? Where sockets: incoming tcp read data does but before after C++ go ack(leaves TCP buffer) :