Re: [asio-users] How to set TCP/IP socket keep-alive options...

[James T. <Jam...@om...>]

Emilio,
 
Not detracting from Nicolas Alvarez' comments at all, but if you want to side-step asio you can always do so using the native() function to get the native socket HANDLE.
Then call WSAIoctl as per your example.
 
Jim
 

________________________________

From: Emilio Pombo [mailto:ep...@in...]
Sent: Tue 27/01/2009 16:57
To: A: Lista Asio
Subject: [asio-users] How to set TCP/IP socket keep-alive options...


Hi guys, I'm a C++ programmer using Boost Asio from some month ago.

I want to know if there is any way to set TCP/IP protocol keep-alive options on an Asio socket abstraction?
I enabled keep-alive property, as the web example shows easy with something like:

...
    asio::socket_base::keep_alive keepAlive(true);
    m_socket.set_option(keepAlive);
...
 
But the default -in my case native implementation is WinSock, I'm on win32- keep-alive time is too big for my aplication requeriments.
When I mentioned "keep-alive options" I refer to keep-alive time, interval, etc, ie. on a WinSock native implemtation should I think it could be donne by something like:
 
...
    int iRet = setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char*)&bOptVal, bOptLen);
    if(iRet == SOCKET_ERROR) {  
        return WSAGetLastError();  
    }  
 
    DWORD dwBytes = 0;  
    tcp_keepalive kaSettings= {0}, sReturned = {0} ;  
    kaSettings.onoff = 1 ;  
    kaSettings.keepalivetime = m_keepAliveTime; // Keep Alive in n sec.  
    kaSettings.keepaliveinterval = m_keepAliveInterval; // Resend if No-Reply  
    if (WSAIoctl(sock, SIO_KEEPALIVE_VALS, &kaSettings, sizeof(kaSettings), &sReturned, sizeof(sReturned), &dwBytes, NULL, NULL) != 0) {  
        return WSAGetLastError();
    }
...
 
Thanks a lot, regards.
 
Emilio Pombo
Development Team
ep...@in...
 
Tel: +598 2 400-7885
www.inConcertCC.com <http://www.inconcertcc.com/> 
 

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