How to check connection to X server

[Levine, Rob]

I have an app that connects to an X server and listens for particular
events.

Periodically, I need to query the X serve to determine if the app is
still connected.

How can I do this?

Is there an X api call, perhaps, that I could send to the X server that
will reply with a status if the connection is ok or not?

Thanks in advance for any help!

Rob
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