readv: parallel or sequential?

[Ivan Voras]

Dag-Erling Smørgrav wrote:

> But to return to what Ivan was asking, I think what the man page is
> trying to say is that you can't use readv() to e.g. read individual
> network packets into separate buffers (unless each packet just happens
> to fit exactly within each buffer).

What about streaming protocols like TCP? If, for example, I know I have
a N-byte header, N2-byte body, couldn't readv handle it with two iovecs?

But that's not why I started the discussion. I'm looking for a way to do
"scattered" async IO on files (the intention: feed an array of offsets,
lengths and buffers into the kernel, let it perform the requests in
parallel, if it can) and started with this man page.

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