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log_error() would probably fail completely if used, and would certainly print garbage for anything that needed to be interpolated into the message, because it was failing to use the correct printing subroutine for a va_list argument. This bug likely went undetected because the error cases this code is used for are rarely exercised - they only occur when Windows security API calls fail catastrophically (out of memory, security subsystem corruption, etc). The FRONTEND variant can be fixed just by calling vfprintf() instead of fprintf(). However, there was no va_list variant of write_stderr(), so create one by refactoring that function. Following the usual naming convention for such things, call it vwrite_stderr(). Author: Bryan Green <dbryan.green@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/CAF+pBj8goe4fRmZ0V3Cs6eyWzYLvK+HvFLYEYWG=TzaM+tWPnw@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/.