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This makes it possible to query for things like the SSL version and cipher used, without depending on OpenSSL functions or macros. That is a good thing if we ever get another SSL implementation. PQgetssl() still works, but it should be considered as deprecated as it only works with OpenSSL. In particular, PQgetSslInUse() should be used to check if a connection uses SSL, because as soon as we have another implementation, PQgetssl() will return NULL even if SSL is in use.
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.