Re: Socket Keepalive

Thanks Sam.
For the application I am developing, the server side (my program) will be
keeping the socket open until a specific action is taken by the operations
staff to shut it down. The client that is communicating with my program
will keep the socket open on their side, but will periodically send
"keepalive" packets down the line to ensure that the connection is still
active. I have been informed that all I need to do is enable the
SO_KEEPALIVE function on the setsockopt call.

Jeff Young
Sr. Programmer Analyst

On Wed, Sep 2, 2015 at 4:54 PM, Sam_L <lennon_s_j@xxxxxxxxxxx> wrote:

Jeff,

I imagine you have already considered this, but from prior comments,
please make sure that you understand what the client means by Keepalive.

In a prior job, we had an RPG program that sent socket messages to a PC.
One PC program was receiving and staging the sockets messages which were
processed by another PC program that was driving a conveyor system. The PC
program that was driving the conveyors would send regular "KeepAlive"
messages to the RPG program, to be sure that this PC program had not
crashed. If the RPG program determined that that last "KeepAlive" was over
x minutes ago, the RPG alerted the operations staff. In theory, the socket
connection, run by a separate PC program could still be up, but the PC
conveyor program that was driving the conveyors might have crashed, and the
warehouse was idle.

In your case, I'm wondering if they are sending you a specific message
that you are expected to respond to, so they know you are still there. I
kind of expect this is not the case, but I thought I would mention it.

Sam

On 9/2/2015 1:19 PM, Jeff Young wrote:

In a previous post, it was recommended that I use the SO_KEEPALIVE in the
setsockopt to enable my program to use this.
I have not been able to find any good example on how to set this and how
to
configure the keepalive interval.
Does anyone have an example of this that I can refer to?


Jeff Young
Sr. Programmer Analyst

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