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Michael Paquier 12198239c0 Add safeguards for pg_fsync() called with incorrectly-opened fds 
On some platforms, fsync() returns EBADFD when opening a file descriptor
with O_RDONLY (read-only), leading ultimately now to a PANIC to prevent
data corruption.

This commit adds a new sanity check in pg_fsync() based on fcntl() to
make sure that we don't repeat again mistakes with incorrectly-set file
descriptors so as problems are detected at an early stage.  Without
that, such errors could only be detected after running Postgres on a
specific supported platform for the culprit code path, which could take
some time before being found.  b8e19b93 was a fix for such a problem,
which got undetected for more than 5 years, and a586cc4b fixed another
similar issue.

Note that the new check added works as well when fsync=off is
configured, so as all regression tests would detect problems as long as
assertions are enabled.  fcntl() being not available on Windows, the
new checks do not happen there.

Author: Michael Paquier
Reviewed-by: Mark Dilger
Discussion: https://postgr.es/m/20191009062640.GB21379@paquier.xyz
2019-11-26 13:32:52 +09:00
config Simplify PGAC_STRUCT_TIMEZONE Autoconf macro 2019-10-07 16:47:23 +02:00
contrib Make the order of the header file includes consistent. 2019-11-25 08:08:57 +05:30
doc Doc: improve discussion of race conditions involved in LISTEN. 2019-11-24 18:03:39 -05:00
src Add safeguards for pg_fsync() called with incorrectly-opened fds 2019-11-26 13:32:52 +09:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.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 Remove configure --disable-float4-byval 2019-11-21 18:29:21 +01:00
configure.in Remove configure --disable-float4-byval 2019-11-21 18:29:21 +01:00
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/.