A symbol or a foreign pointer.
One of the keywords
A foreign pointer of type ssl-ctx-pointer.
The value of ssl-ctx can also be a foreign pointer of type ssl-ctx-pointer, in which case it is simply returned. If ssl-ctx is a foreign pointer of type ssl-pointer, then
make-ssl-ctx signals an error.
The meaning of the keyword arguments ssl-ctx and ssl-side is as described for socket-stream. The default value of ssl-ctx is
t and the default value of ssl-side is
LispWorks User Guide and Reference Manual - 20 Sep 2017