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Heikki Linnakangas bb24439cef Detach postmaster process from pg_ctl's session at server startup. 
pg_ctl is supposed to daemonize the postmaster process, so that it's not
affected by signals to the launching process group.  Before this patch, if
you had a shell script that used "pg_ctl start", and you interrupted the
shell script after postmaster had been launched, postmaster was also
killed.  To fix, call setsid() after forking the postmaster process.

Long time ago, we had a 'silent_mode' option, which daemonized the
postmaster process by calling setsid(), but that was removed back in 2011
(commit f7ea6beaf4).  We discussed bringing that back in some form, but
pg_ctl is the documented way of launching postmaster to the background, so
putting the setsid() call in pg_ctl itself seems appropriate.

Just putting postmaster in a separate session would change the behavior
when you interrupt "pg_ctl -w start", e.g. with CTRL-C, while it's waiting
for postmaster to start.  The historical behavior has been that
interrupting pg_ctl aborts the server launch, which is handy if the server
is stuck in recovery, for example, and won't fully start up.  To keep that
behavior, install a signal handler in pg_ctl, to explicitly kill
postmaster, if pg_ctl is interrupted while it's waiting for the server to
start up.  This isn't 100% watertight, there is a small window after
forking the postmaster process, where the signal handler doesn't know the
postmaster's PID yet, but seems good enough.

Arguably this is a long-standing bug, but I refrained from back-batching,
out of fear of breaking someone's scripts that depended on the old
behavior.

Reviewed by Tom Lane.  Report and original patch by Paul Guo, with
feedback from Michael Paquier.

Discussion: https://www.postgresql.org/message-id/CAEET0ZH5Bf7dhZB3mYy8zZQttJrdZg_0Wwaj0o1PuuBny1JkEw%40mail.gmail.com
2019-01-14 14:50:58 +02:00
config configure: Update python search order 2019-01-13 10:23:48 +01:00
contrib Extend pg_stat_statements_reset to reset statistics specific to a 2019-01-11 08:50:09 +05:30
doc Make INSTALL makefile rule more robust 2019-01-13 10:50:36 +01:00
src Detach postmaster process from pg_ctl's session at server startup. 2019-01-14 14:50:58 +02:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.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 configure: Update python search order 2019-01-13 10:23:48 +01:00
configure.in Update copyright for 2019 2019-01-02 12:44:25 -05:00
COPYRIGHT Update copyright for 2019 2019-01-02 12:44:25 -05:00
GNUmakefile.in Process EXTRA_INSTALL serially, during the first temp-install. 2018-12-31 13:54:38 -08:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Fix non-GNU makefiles for AIX make. 2017-11-30 00:57:22 -08:00
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/.