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The following changes are made to pg_write_zeros(), the API able to write series of zeros using vectored I/O: - Add of an "offset" parameter, to write the size from this position (the 'p' of "pwrite" seems to mean position, though POSIX does not outline ythat directly), hence the name of the routine is incorrect if it is not able to handle offsets. - Avoid memset() of "zbuffer" on every call. - Avoid initialization of the whole IOV array if not needed. - Group the trailing write() call with the main write() call, simplifying the function logic. Author: Andres Freund Reviewed-by: Michael Paquier, Bharath Rupireddy Discussion: https://postgr.es/m/20230215005525.mrrlmqrxzjzhaipl@awork3.anarazel.de
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/.