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Andres Freund a586cc4b6c Use a fd opened for read/write when syncing slots during startup, take 2. 
Cribbing from dfbaed4597:
    Some operating systems, including the reporter's windows, return EBADFD
    or similar when fsync() is invoked on a O_RDONLY file descriptor.
    Unfortunately RestoreSlotFromDisk() does exactly that; which causes
    failures after restarts in at least some scenarios.

    If you hit the bug the error message will be something like
    ERROR: could not fsync file "pg_replslot/$name/state": Bad file descriptor

    Simply use O_RDWR instead of O_RDONLY when opening the relevant file
    descriptor to fix the bug.

Unfortunately this fix was undone in 82a5649fb9. Re-apply, and add a
comment.

Bug: 16039
Reported-By: Hans Buschmann
Author: Andres Freund
Discussion: https://postgr.es/m/16039-196fc97cc05e141c@postgresql.org
Backpatch: 12-, as 82a5649fb9
2019-10-04 13:34:28 -07:00
config Remove obsolete reference to Irix 2019-08-18 06:53:28 +02:00
contrib Allow definition of lock mode for custom reloptions 2019-09-25 10:13:52 +09:00
doc pgbench: add --partitions and --partition-method options. 2019-10-03 08:27:07 +05:30
src Use a fd opened for read/write when syncing slots during startup, take 2. 2019-10-04 13:34:28 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.gitattributes Add XSL stylesheet to fix up SVG files 2019-06-19 21:26:42 +02:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Revert "For all ppc compilers, implement pg_atomic_fetch_add_ with inline asm." 2019-09-14 19:38:41 -07:00
configure.in Revert "For all ppc compilers, implement pg_atomic_fetch_add_ with inline asm." 2019-09-14 19:38:41 -07:00
COPYRIGHT Update copyright for 2019 2019-01-02 12:44:25 -05:00
GNUmakefile.in Add "headerscheck" script to test header-file compilability under C. 2019-08-19 14:22:56 -04:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00

README 

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/.