OpenSSL example using memory BIO with non-blocking socket IO

Where's the non-blocking setup snippet located ? I observed the code above and it seems it doesn't do any no-blocking IO whatsoever (in terms of what a socket descriptor concerns) but rather, it implements multiplexing using poll. am I wrong?

Author

correct .... any waiting of the main thread happens in the call to poll(). The thread will wait in there for any of the sockets to become ready to read or write.

Would you be able to help with some openssl config issues?

Thanks. It is a reference to my development.
so.. how can i close the ssl socket? graceful shutdown..
ex) ssl_shutdown()

plz help me

at line 283, is it possible the error SSLSTATUS_WANT_IO means more bytes to read?

Author

Yes. Could be either SSL_ERROR_WANT_WRITE or SSL_ERROR_WANT_READ. If it wants write then the following block does the BIO_read. If it wants read, then we will stay within the outer while (len > 0) loop, so there will a further call to BIO_write.

Where is the code to do the handshake: SSL_do_handshake?

Author

the handshake is initiated in the client (rather than in the server, which is shown above), see the client example at https://github.com/darrenjs/openssl_examples

thanks very much, this example really helps.