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On Windows, this code did not handle error conditions correctly at all, since it looked at "errno" which is not used for socket-related errors on that platform. This resulted, for example, in failure to connect to a PostgreSQL server with GSSAPI enabled. We have a convention for dealing with this within libpq, which is to use SOCK_ERRNO and SOCK_ERRNO_SET rather than touching errno directly; but the GSSAPI code is a relative latecomer and did not get that memo. (The equivalent backend code continues to use errno, because the backend does this differently. Maybe libpq's approach should be rethought someday.) Apparently nobody tries to build libpq with GSSAPI support on Windows, or we'd have heard about this before, because it's been broken all along. Back-patch to all supported branches. Author: Ning Wu <ning94803@gmail.com> Co-authored-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAFGqpvg-pRw=cdsUpKYfwY6D3d-m9tw8WMcAEE7HHWfm-oYWvw@mail.gmail.com Backpatch-through: 13
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/.