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A background worker can use pq_redirect_to_shm_mq() to direct protocol that would normally be sent to the frontend to a shm_mq so that another process may read them. The receiving process may use pq_parse_errornotice() to parse an ErrorResponse or NoticeResponse from the background worker and, if it wishes, ThrowErrorData() to propagate the error (with or without further modification). Patch by me. Review by Andres Freund.
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/.