From: "John W. Linville" <[EMAIL PROTECTED]>
Date: Thu, 28 Jul 2005 15:47:02 -0400
> On Thu, Jul 28, 2005 at 12:38:53PM -0700, David S. Miller wrote:
> > Probably it is better to define the ethtool object returned to the
> > user as some kind of TLV, so the size doesn't matter.
>
> Can you point Jon at a good example of this?
Netlink uses this kind of thing a lot, but not too much ethtool
stuff does. But something like:
struct ethtool_perm_addr {
unsigned int cmd;
int size;
char data[0];
};
and the user says how large his buffer is in the request,
and if that is not large enough you return -ETOOBIG or
some similarly discernable error code so that userspace
can allocate a larger buffer. In fact, the kernel can
rewrite the "size" field in this case to indicate how
large the buffer needs to be to hold the full address.
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