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When built using OpenSSL, pg_strong_random() uses RAND_bytes() to generate the random number. On very rare occasions that can fail, if its PRNG has not been seeded with enough data. Additionally, once it does fail, all subsequent calls will also fail until more seed data is added. Since this is required during backend startup, this can result in all new backends failing to start until a postmaster restart. Guard against that by checking the state of OpenSSL's PRNG using RAND_status(), and if necessary (very rarely), seeding it using RAND_poll(). Back-patch to v10, where pg_strong_random() was introduced. Dean Rasheed and Michael Paquier. Discussion: https://postgr.es/m/CAEZATCXMtxbzSAvyKKk5uCRf9pNt4UV%2BF_5v%3DgLfJUuPxU4Ytg%40mail.gmail.com |
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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/.