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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