Question

I have tried getting the value of 0 over the network when the socket connection has been gracefully closed by the sender as specified here. When I used unblocked call I was getting -1 in the UDP stream before data was sent from sender to the receiver . After the original data was sent and when I closed the connection(tried shutting down the socket and closing the socket on the sender side) I was still getting -1 rather than getting 0 indicating the socket has been closed. can anybody please help is there is any way to get the same.

Thanks.

Answer 1

When UDP socket is close(2)-ed there’s nothing sent out, even if the socket was connect(2)-ed. TCP, on the other hand, initiates four-way connection tear-down. Looks like you are confusing these two cases.