Need SSL_shutdown() support for libevent

[pprindeville]

Opening this to get input from the OpenSSL community. It's not clear to us in libevent-land how to handle clean shutdowns:

http://archives.seul.org/libevent/users/Aug-2018/msg00003.html

[pprindeville]

@azat Heads up.

[pprindeville]

And this thread seems to be related:

https://mta.openssl.org/pipermail/openssl-users/2018-August/008419.html

[kroeckx]

Have you read the recent version of the manpage? https://www.openssl.org/docs/manmaster/man3/SSL_shutdown.html

I think it should explain everything. If it's still not clear, please ask questions.

[azat]

@pprindeville it is not about "it is unclear" it is about "add SSL_shutdown() and be ready to the fact that close/free bufferevent can do some io over network"

So this not an openssl issue, can be closed.