[Bug 232210] sendfile(2) doesn't percolate up issues with copyout(9) related to sbytes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232210

Gleb Smirnoff <glebius at FreeBSD.org> changed:

           What    |Removed                     |Added
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             Status|New                         |In Progress

--- Comment #2 from Gleb Smirnoff <glebius at FreeBSD.org> ---
That's a good catch, but I don't fully agree on the patch. Some return values
of sendfile aren't errors, and the patch doesn't cover them. If sendfile
returns EAGAIN, which is normal for non-blocking socket, we again ignore
copyout error. I think we should take in copyout error always.

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