given inode and fs, determine if dir or not?

[Mike Khaw]

If I have an inode (and fs root) on hand, how do I tell whether that
inode is a directory or not?  The definition of struct inode suggests
that it's possible, but I can't find a man entry that says how.

If it matters, this would be for SunOS 3.x and Ultrix 2.x

Thanks,
Mike Khaw
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