MSDN says that "If the connection has been gracefully closed, the return value is zero" for recvfrom. When exactly does this happen ? When program on the other end has been closed ? Or when a certain time has passed without packets ? I know UDP is connectionless, so I didnt know it could close some kind of connection, when i thought there isnt one. [edited by - FearedPixel on May 18, 2002 4:15:42 PM]

recvfrom isn''t used exclusively with UDP. The zero return value is only meaningful for for ''connected'' sockets.

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I see.

So in that case, to detect if a user abnormally disconnected (due to program crash or connection etc), I have to constantly check the time since the last packet from the user, and if the time goes over say 30 seconds, then consider the user timed out. Right ?

Is there not an easier way by any chance ?

Don''t think there''s an ''easy'' way, whats so hard about it anyway?

I''d go for longer than 30 seconds before timeout tho.