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Buildfarm members bowerbird and jacana have shown intermittent "could not bind IPv4 socket" failures in the BinInstallCheck stage since mid-December, shortly after commits 1caef31d9e550408 and 9821492ee417a591 changed the logic for selecting which port to use in temporary installations. One plausible explanation is that we are randomly selecting ports that are already in use for some non-Postgres purpose. Although the code tried to defend against already-in-use ports, it used pg_isready to probe the port which is quite unhelpful: if some non-Postgres server responds at the given address, pg_isready will generally say "no response", leading to exactly the wrong conclusion about whether the port is free. Instead, let's use a simple TCP connect() call to see if anything answers without making assumptions about what it is. Note that this means there's no direct check for a conflicting Unix socket, but that should be okay because there should be no other Unix sockets in use in the temporary socket directory created for a test run. This is only a partial solution for the TCP case, since if the port number is in use for an outgoing connection rather than a listening socket, we'll fail to detect that. We could try to bind() to the proposed port as a means of detecting that case, but that would introduce its own failure modes, since the system might consider the address to remain reserved for some period of time after we drop the bound socket. Close study of the errors returned by bowerbird and jacana suggests that what we're seeing there may be conflicts with listening not outgoing sockets, so let's try this and see if it improves matters. It's certainly better than what's there now, in any case. Michael Paquier, adjusted by me to work on non-Windows as well as Windows
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/.