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Tom Lane a3b709cf73 Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c. 
In the name of ABI stability (that is, to avoid a library major
version bump for libpq), libpq still exports a version of pqsignal()
that we no longer want to use ourselves.  However, since that has
the same link name as the function exported by src/port/pqsignal.c,
there is a link ordering dependency determining which version will
actually get used by code that uses libpq as well as libpgport.a.

It now emerges that the wrong version has been used by pgbench and
psql since commit 06843df4a rearranged their link commands.  This
can result in odd failures in pgbench with the -T switch, since its
SIGALRM handler will now not be marked SA_RESTART.  psql may have
some edge-case problems in \watch, too.

Since we don't want to depend on link ordering effects anymore,
let's fix this in the same spirit as b6c7cfac8: use macros to change
the actual link names of the competing functions.  We cannot change
legacy-pqsignal.c's exported name of course, so the victim has to be
src/port/pqsignal.c.

In master, rename its exported name to be pqsignal_fe in frontend or
pqsignal_be in backend.  (We could perhaps have gotten away with using
the same symbol in both cases, but since the FE and BE versions now
work a little differently, it seems advisable to use different names.)

In back branches, rename to pqsignal_fe in frontend but keep it as
pqsignal in backend.  The frontend change could affect third-party
code that is calling pqsignal from libpgport.a or libpgport_shlib.a,
but only if the code is compiled against port.h from a different minor
release than libpgport.  Since we don't support using libpgport as a
shared library, it seems unlikely that there will be such a problem.
I left the backend symbol unchanged to avoid an ABI break for
extensions.  This means that the link ordering hazard still exists
for any extension that links against libpq.  However, none of our own
extensions use both pqsignal() and libpq, and we're not making things
any worse for third-party extensions that do.

Report from Andy Fan, diagnosis by Fujii Masao, patch by me.
Back-patch to all supported branches, as 06843df4a was.

Discussion: https://postgr.es/m/87msfz5qv2.fsf@163.com
2025-01-14 18:50:24 -05:00
config Log LLVM library version in configure output. 2023-10-22 14:24:04 +13:00
contrib Restore smgrtruncate() prototype in back-branches. 2025-01-08 10:47:43 +13:00
doc Document strange jsonb sort order for empty top level arrays 2025-01-03 10:29:07 -05:00
src Avoid symbol collisions between pqsignal.c and legacy-pqsignal.c. 2025-01-14 18:50:24 -05:00
.cirrus.star ci: Prepare to make compute resources for CI configurable 2023-08-23 15:15:29 -07:00
.cirrus.tasks.yml ci: Fix cached MacPorts installation management 2024-11-27 11:30:19 -05:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:29 -07:00
.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 Backpatch addition of .git-blame-ignore-revs 2022-08-05 19:36:24 +02:00
.gitattributes Exclude LLVM files from whitespace checks 2024-11-27 11:09:48 +01:00
.gitignore Add portlock directory to .gitignore 2022-11-26 07:47:01 -05:00
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure If a C23 compiler is detected, try asking for C17. 2024-11-27 15:43:18 +13:00
configure.ac If a C23 compiler is detected, try asking for C17. 2024-11-27 15:43:18 +13:00
COPYRIGHT Update copyright for 2025 2025-01-01 11:21:54 -05:00
GNUmakefile.in Remove temporary portlock directory during make [dist]clean. 2022-11-26 10:30:46 -05:00
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/.