Hello!

This patch series add kernel TLS / SSL_sendfile() support.
Works on FreeBSD 13.0+ and Linux with kernel 4.13+ (at least 5.2
is recommended, tested with 5.11).

The following questions need additional testing/attention:

- What about EINTR? Looks like it simply results in SSL_ERROR_WANT_WRITE,
so might need extra checking to make sure there will be another write
event.

- What about SSL_sendfile(), early data and write blocking?
Ref. c->ssl->write_blocked, 7431:294162223c7c by pluknet@.
Looks like it is not a problem with SSL_sendfile(), but needs
further checking.

- What about FreeBSD aio sendfile (aka SF_NODISKIO)? Might be
easy enough to support.

Review and testing appreciated.

--
Maxim Dounin

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