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This new facility can not only be used by xlog.c to carry out crash recovery, but also by external programs. By supplying a function to read XLog pages from somewhere, all the WAL reading can be used for completely different purposes. For the standard backend use, the behavior should be pretty much the same as previously. As for non-backend programs, an hypothetical pg_xlogdump program is now closer to reality, but some more backend support is still necessary. This patch was originally submitted by Andres Freund in a different form, but Heikki Linnakangas opted for and authored another design of the concept. Andres has advanced the patch since Heikki's initial version. Review and some (mostly cosmetics) changes by me.
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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.