On Thu, Feb 15, 2024 at 11:24:38AM +1100, David Gibson wrote:
> On Wed, Feb 14, 2024 at 09:56:21AM +0100, Laurent Vivier wrote:
> > Introduce functions to copy to/from a buffer from/to an iovec array,
> > to compute data length in in bytes of an iovec and to copy memory from
> > an iovec to another.
> > 
> > iov_from_buf(), iov_to_buf(), iov_size(), iov_copy().
> > 
> > Signed-off-by: Laurent Vivier <lvivier@redhat.com>

[snip]
> > +size_t iov_from_buf(const struct iovec *iov, unsigned int iov_cnt,
> > +		    size_t offset, const void *buf, size_t bytes)

One other thing I didn't think of on my first reply: although it
probably doesn't matter in practice, struct msghdr uses a size_t for
the length of the vector.  So, I think it makes sense for us to
standardise on that too.  To confuse matters, writev() uses a (signed)
int, but we work with recvmsg() etc. more than we do with writev() so
I think size_t is a better choice.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson