Wouldn't it be better just to *try* ioctls and see which ones work and
which ones don't?
This ioctl situation reminds me of how novice programmers assume that
they have to call access() or stat() and check a file for existence
and readability before calling open(). But that's just stupid when
you think about it, because if the file isn't there and the open()
fails, that's OK! Failures are not fatal.
Similarly, ioctl failures are not fatal. Just Try Them.
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