Detecting unexpectedly closed sockets
alex at tweedly.net
Sat Oct 16 19:27:37 EDT 2004
At 21:24 16/10/2004 +0200, Tomas Franzén wrote:
>Dar, Xavier, Björnke,
>Thanks for your suggestions.
>I will let the server send a ping command to the client, and let the
>When the server hasn't received a ping for a while, it considers the
>client gone, and vice versa.
If it were me, I'd make the client send the "ping" and the server respond.
It's equally effective for keeping track of connections, and keeps the
"sense" of initiation and reaction right (for my way of thinking of
And I'd be traditional, and set it up so the keep-alives should happen
every N seconds - and the server only assumes loss of connection if 3 * N
seconds have elapsed since the last ping was received. You might even allow
clients to have different keep-alive timer values (various reasons why you
might want that), and then they should pass their timer value to the
server, so it can use the appropriate time-out logic. (And possibly thereby
avoid a potential future bug if you need to change the time-out value and
operator error leads to it being configured differently between the two ends).
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