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Subject: Re: [Boost-users] asio, check remote socket open
From: ecyrbe (ecyrbe_at_[hidden])
Date: 2010-07-09 03:56:26


>I have a server application. It listens for connection and receives data.
when data is received, the receive "handler routine" is called. Inside the
handler there is async timer. This timer's handler again initiates a new
>timer.This keeps on executing. During this time, the remote client which
connects to the server closes the connection "intentionally". Inside the
timer handler routine, is there any way to chek the connection is closed or
>not? (From the timer handler, I can access the socket and io_service).

>I have tried with

>socket::is_open(), socket::remote_endpoint(), they are successfull and does
not throw any exception.

>Thanks a lot,

> Lloyd

As it was said, even reading is not reliable in case of a cable
disconnection or even some strange ISP interruption.

The only way is to try writing something to the user (a sort of application
defined ping), beacause this should trigger a tcp error at one moment if the
connection was closed.

Needless to say, that the tcp client should do the same to detect properly
closed connections.

You can even add a timeout in both sides to monitor user or server activity
(incoming and outgoing data), and close the connection if the timeout is

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