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Turns out that the socket option for this is named TCP_KEEPALIVE_THRESHOLD, at least according to the tcp(7P) man page for Solaris 11. (But since that text refers to "SunOS", it's likely pretty ancient.) It appears that the symbol TCP_KEEPALIVE does get defined on that platform, but it doesn't seem to represent a valid protocol-level socket option. This leads to bleats in the postmaster log, and no tcp_keepalives_idle functionality. Per bug #14720 from Andrey Lizenko, as well as an earlier report from Dhiraj Chawla that nobody had followed up on. The issue's been there since we added the TCP_KEEPALIVE code path in commit 5acd417c8, so 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/.