This patch enables TCP keepalives on VNC connections. After 60-seconds
of idle time, probes are sent every 2 seconds with the connection
resetting after 4 failed probes. This might be a rather aggressive
setting -- 8 seconds until connection is reset.

Also, I believe this is a linux-specific way of doing this; not sure
what the posix/windows method is. Open to suggestions.

Yaniv: I do not believe this interferes with the 'shared desktop'.

Signed-off-by: David Ahern <dsahern@gmail.com>


Avi Kivity wrote:
> David S. Ahern wrote:
>>>> I don't think so.  But enabling keepalives for vnc should be a one
>>>> liner (or rather two, since we want to change the default interval).
>>>>       
>>
>> What default interval would you prefer over the global values?
>>   
> 
> The global one is two hours.
> 
> Say sending a probe every two seconds, failing if four probes don't come
> back?
> 
> 
>