NOTIFYmessages (which include the PID of the notifying backend process). Note that the PID belongs to a process executing on the database server host, not the local host!
"TLSv1.2", but an implementation may return other strings if some other protocol is used.
"DHE-RSA-DES-CBC3-SHA". The names are specific to each SSL implementation.
SSLstruct. To use this function, code along the following lines could be used:
PQsslStruct(conn, "OpenSSL"). It should not be used in new applications, because the returned struct is specific to OpenSSL and will not be available if another SSL implementation is used. To check if a connection uses SSL, call
PQsslInUseinstead, and for more details about the connection, use