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Buildfarm evidence shows that TCP_KEEPALIVE_THRESHOLD doesn't exist after all on Solaris < 11. This means we need to take positive action to prevent the TCP_KEEPALIVE code path from being taken on that platform. I've chosen to limit it with "&& defined(__darwin__)", since it's unclear that anyone else would follow Apple's precedent of spelling the symbol that way. Also, follow a suggestion from Michael Paquier of eliminating code duplication by defining a couple of intermediate symbols for the socket option. In passing, make some effort to reduce the number of translatable messages by replacing "setsockopt(foo) failed" with "setsockopt(%s) failed", etc, throughout the affected files. And update relevant documentation so that it doesn't claim to provide an exhaustive list of the possible socket option names. Like the previous commit (f0256c774), back-patch to all supported branches. Discussion: https://postgr.es/m/20170627163757.25161.528@wrigleys.postgresql.org
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: https://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 https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.