connect the SSL object with a
*ssl, BIO *rbio,
connects the BIOs rbio and
wbio for the read and write operations of the TLS/SSL
(encrypted) side of ssl.
The SSL engine inherits the behaviour of rbio and wbio, respectively. If a BIO is non-blocking, the ssl will also have non-blocking behaviour.
If there was already a BIO connected to ssl, BIO_free(3) will be called (for both the reading and writing side, if different).
SSL_set_bio() cannot fail.
BIO_new(3), ssl(3), SSL_accept(3), SSL_connect(3), SSL_get_rbio(3), SSL_shutdown(3)