Have you tried calling sock_getsockopt(socket, SOL_SOCKET, SO_ERROR, &err, &optlen)? I'm not certain the suggestion above will work, but that is where I'd start. Hope this helps, -josh On May 30, 2012, at 8:49 AM, Volodymyr Shcherbyna <volodymyr@shcherbyna.com> wrote:

Hello Everyone,

I am trying to detect in socket level NKE failed TCP connections and to determine the reason why they are failed. I can see that successful TCP connections are generating sock_evt_connected event in sp_notify_func : this way I am able to distinguish between successful connections and failed one.

The next step is to try to determine the reason of failure: is it a time out, or host is down, or port is closed, etc. It seems like I don't get any errors at socket level NKE. I was trying to see in sf_setopt_func any options which are set on a socket after connections is failed but I could not find any clue on what to filter out. Is there any chance to get this data at socket level NKE? I was hoping to get last error associated with a socket or something simular to GetLastError(...) functions under Windows.

Otherwise, it seems like I have to use IP level filters for that? In this case it seems like it is complicating the task as I would have to have a state machine per each TCP connection and do some manipulations when frames are leaving my machine ...

Thanks for any hints,

-- with best regards, Volodymyr. _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/jgraessley%40apple.com

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