Accesses the SSL_CTX attached to a socket stream.
socket-stream-ctx socket-stream => ssl-ctx-pointer
A foreign pointer of type ssl-ctx-pointer, or nil.
The function socket-stream-ctx accesses the SSL_CTX that is attached to the socket-stream socket-stream.
It returns nil if SSL is not attached.
LispWorks User Guide and Reference Manual - 13 Feb 2015