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Tom Lane faa189c932 Move libpq's write_failed mechanism down to pqsecure_raw_write(). 
Commit 1f39a1c06 implemented write-failure postponement in pqSendSome,
which is above SSL/GSS processing.  However, we've now seen failures
indicating that (some versions of?) OpenSSL have a tendency to report
write failures prematurely too.  Hence, move the primary responsibility
for postponing write failures down to pqsecure_raw_write(), below
SSL/GSS processing.  pqSendSome now sets write_failed only in corner
cases where we'd lost the connection already.

A side-effect of this change is that errors detected in the SSL/GSS
layer itself will be reported immediately (as if they were read
errors) rather than being postponed like write errors.  That's
reverting an effect of 1f39a1c06, and I think it's fine: if there's
not a socket-level error, it's hard to be sure whether an OpenSSL
error ought to be considered a read or write failure anyway.

Another important point is that write-failure postponement is now
effective during connection setup.  OpenSSL's misbehavior of this
sort occurs during SSL_connect(), so that's a change we want.

Per bug #17391 from Nazir Bilal Yavuz.  Possibly this should be
back-patched, but I think it prudent to let it age awhile in HEAD
first.

Discussion: https://postgr.es/m/17391-304f81bcf724b58b@postgresql.org
2022-02-12 14:00:09 -05:00
config Remove configure's check for rl_completion_append_character. 2022-02-02 23:01:56 -05:00
contrib Add decoding of sequences to test_decoding 2022-02-12 00:51:46 +01:00
doc pg_basebackup: Allow client-side LZ4 (de)compression. 2022-02-11 09:41:42 -05:00
src Move libpq's write_failed mechanism down to pqsecure_raw_write(). 2022-02-12 14:00:09 -05:00
.cirrus.yml windows: Improve crash / assert / exception handling. 2022-02-02 18:33:25 -08:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add another old commit to git-blame-ignore-revs. 2021-11-03 17:34:19 -07:00
.gitattributes gitattributes: Add new entry to silence whitespace error 2021-06-05 07:57:31 +02:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Test honestly for <sys/signalfd.h>. 2022-02-09 14:24:54 -05:00
configure.ac Test honestly for <sys/signalfd.h>. 2022-02-09 14:24:54 -05:00
COPYRIGHT Update copyright for 2022 2022-01-07 19:04:57 -05:00
GNUmakefile.in add missing tag from commit b8c4261e5e 2021-07-01 15:47:46 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00

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/.