Michael Paquier 522a31ac87 Switch psql's TAP test for query cancellation to use IPC::Run::signal()
Previously, the test relied on a trick with a shell to retrieve the PID
of the psql session to be stopped with SIGINT, that was skipped on
Windows.  This commit changes the test to use IPC::Run::signal()
instead, which still does not work on Windows, but for a different
reason: SIGINT would stop the test before finishing.

This should allow the test to run on non-Windows platforms where PPID is
not supported (like NetBSD), spreading it a bit more across the
buildfarm.  And the logic of the test is simpler.

It is the first time in the tree that IPC::Run::signal() is used, so, as
a matter of safety (or just call that as me having cold feet), no
backpatch is done, at least for now.

Author: Yugo NAGATA
Reviewed-by: Fabien Coelho
Discussion: https://postgr.es/m/20230810125935.22c2922ea5250ba79358965b@sraoss.co.jp
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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/.
Description
he World's Most Advanced Open Source Relational Database.
Readme 742 MiB
Languages
C 85.3%
PLpgSQL 5.9%
Perl 4.4%
Yacc 1.2%
Meson 0.7%
Other 2.2%