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tcp: Add tcp_inq to get available receive bytes on socket
Create a common kernel function to get the number of bytes available on a TCP socket. This is based on code in INQ getsockopt and we now call the function for that getsockopt. Signed-off-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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