How to tell if running in a linux console versus an ssh session?

Posted by Stéphane on Stack Overflow See other posts from Stack Overflow or by Stéphane
Published on 2010-05-25T19:55:32Z Indexed on 2010/05/25 20:11 UTC
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linux

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console

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tty

I have an application that needs to behave differently if run directly from the linux console. So if a user connects with SSH to run FooBar, or the user walks over to the console and logs in directly to run FooBar, I want it to do something different.

What C API do I need to call to tell the difference between these two scenarios? I was thinking I'd have to look at the "tty/pts" information (such as what I see when I run "ps axf"), but I'm not certain if that is the best solution, nor what API to call to get that information.

Hints appreciated. :)

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