Re: SO_KEEPALIVE - a solution for where X servers are shut down?

SO_KEEPALIVE is already set for X sockets in the Xtrans library code
that creates all sockets in X.   (See xc/lib/xtrans/Xtranssock.c)

	-Alan Coopersmith-           [email protected]
	 Sun Microsystems, Inc. - X Window System Engineering

Nick Hill wrote:
> The problem:
> When running X programs to a remote X server, if the remote X server
> stops being available, the programs which were being displayed often
> stay running. This results in many stale programs running and using
> resources.
> 
> It appears that by default, xlibs opens TCP sockets to remote X servers
> without setting SO_KEEPALIVE.
> 
> If SO_KEEPALIVE is set, the kernel will send periodic pings through the
> TCP connection. If the other end fails to respond for some time, the TCP
> socket is closed.
> 
> If the TCP socket is closed by the kernel, will X apps also close,
> thereby freeing redundant resources?
> 
> If this would work, can anyone consider a reason not to enable 
> SO_KEEPALIVE?
> 
> Are there run-time options for SO_KEEPALIVE or will the option need to
> be set at source level or compile time?
> 
> If editing source code is required, is there one function responsible
> for opening all X TCP sockets, or would it be a complex task to edit
> Xlibs to enable SO_KEEPALIVE?
> 
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