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How to prevent a POSIX socket from using a cellular connection?

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How to prevent a POSIX socket from using a cellular connection?

Subject: How to prevent a POSIX socket from using a cellular connection?
From: Jens Alfke <email@hidden>
Date: Mon, 08 Dec 2014 13:33:57 -0800

I need to (optionally) prevent a TCP socket from being opened over a cellular connection. The Apple docs describe how to do this when using NSURLConnection or CFStream APIs, but the code in question uses the POSIX/BSD socket API. (Not my choice; I'm using GCDAsyncSocket and that's how it works.)

Is there some setsockopt mode, equivalent to kCFStreamPropertyNoCellular, to disable cellular networking? I couldn't find it in the man page.

—Jens
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