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According to the Single Unix Spec and assorted man pages, you're supposed to use the constants named AF_xxx when setting ai_family for a getaddrinfo call. In a few places we were using PF_xxx instead. Use of PF_xxx appears to be an ancient BSD convention that was not adopted by later standardization. On BSD and most later Unixen, it doesn't matter much because those constants have equivalent values anyway; but nonetheless this code is not per spec. In the same vein, replace PF_INET by AF_INET in one socket() call, which wasn't even consistent with the other socket() call in the same function let alone the remainder of our code. Per investigation of a Cygwin trouble report from Marco Atzeri. It's probably a long shot that this will fix his issue, but it's wrong in any case.
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/.