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After commit b0bea38705, syslogger prints 63 warnings about failing to close a listen socket at postmaster startup. That's because the syslogger process forks before the ListenSockets array is initialized, so ClosePostmasterPorts() calls "close(0)" 64 times. The first call succeeds, because fd 0 is stdin. This has been like this since commit 9a86f03b4e in version 13, which moved the SysLogger_Start() call to before initializing ListenSockets. We just didn't notice until commit b0bea38705 added the LOG message. Reported by Michael Paquier and Jeff Janes. Author: Michael Paquier Discussion: https://www.postgresql.org/message-id/ZOvvuQe0rdj2slA9%40paquier.xyz Discussion: https://www.postgresql.org/message-id/ZO0fgDwVw2SUJiZx@paquier.xyz#482670177eb4eaf4c9f03c1eed963e5f 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/.