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The immediate motivation for this is to provide clean infrastructure for the proposed \if...\endif patch for psql; but it seems like a good thing to have even if that patch doesn't get in. Previously the callback functions could only make use of application-global state, which is a pretty severe handicap. For the moment, the pointer is only passed through to the get_variable callback function. I considered also passing it to the write_error callback, but for now let's not. Neither psql nor pgbench has a use for that, and in the case of psql we'd have to invent a separate wrapper function because we would certainly not want to change the signature of psql_error(). Discussion: https://postgr.es/m/10108.1489418309@sss.pgh.pa.us
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/.