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How can I find out whether TCP connection was torn down by the peer (by sending RST packet or similar) using Windows IOCP API? Specifically, I can’t send or receive any data — there’s no overlapped operation going on. I just want to get an asynchronous notification. Is there a way to do that?
You need to have a read or write pending to detect connection closure. Either will return as Remy suggests on RST but with a pending read you’ll also get notification of when the remote side closes the send side of its connection.
I suggest you always keep an overlapped read pending, if you don’t want to tie up memory you can always make this a zero byte read.