can-not detect TCP disconnects well

pjwhite · #1 (**permalink**) 08-21-2008

Hello everyone. Thanks for reading. I am using Ubuntu 7.04 to experience this problem:

I have written my own programs that communicate to eachother and I am having a hard time detecting a TCP socket disconnect when the remote side's computer has a power-failure (for example).

On the computer that stays up my program continually polls the socket and tries to send a status message. These will never end up failing.

The poll just returns 0 implying a timeout, and the poll before a send returns with a POLLOUT and a send returns the number of bytes I tried to send, implying that it sent properly.

This goes on for ever. I am trying to figure out how to detect that the socket is down so I can clean up my end and listen for the computer to connect again.

Thanks!
PJW

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