From: | Thomas Munro <tmunro(at)postgresql(dot)org> |
---|---|
To: | pgsql-committers(at)lists(dot)postgresql(dot)org |
Subject: | pgsql: Add PSQL_WATCH_PAGER for psql's \watch command. |
Date: | 2021-07-12 23:53:32 |
Message-ID: | E1m35jw-0006Gi-Qg@gemulon.postgresql.org |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-committers |
Add PSQL_WATCH_PAGER for psql's \watch command.
Allow a pager to be used by the \watch command. This works but isn't
very useful with traditional pagers like "less", so use a different
environment variable. The popular open source tool "pspg" (also by
Pavel) knows how to display the output if you set PSQL_WATCH_PAGER="pspg
--stream".
To make \watch react quickly when the user quits the pager or presses
^C, and also to increase the accuracy of its timing and decrease the
rate of useless context switches, change the main loop of the \watch
command to use sigwait() rather than a sleeping/polling loop, on Unix.
Supported on Unix only for now (like pspg).
Author: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Author: Thomas Munro <thomas(dot)munro(at)gmail(dot)com>
Discussion: https://postgr.es/m/CAFj8pRBfzUUPz-3gN5oAzto9SDuRSq-TQPfXU_P6h0L7hO%2BEhg%40mail.gmail.com
Branch
------
master
Details
-------
https://git.postgresql.org/pg/commitdiff/7c09d2797ecdf779e5dc3289497be85675f3d134
Modified Files
--------------
doc/src/sgml/ref/psql-ref.sgml | 28 +++++++++
src/bin/psql/command.c | 133 ++++++++++++++++++++++++++++++++++++++---
src/bin/psql/common.c | 11 ++--
src/bin/psql/common.h | 2 +-
src/bin/psql/help.c | 6 +-
src/bin/psql/startup.c | 19 ++++++
6 files changed, 184 insertions(+), 15 deletions(-)
From | Date | Subject | |
---|---|---|---|
Next Message | Tom Lane | 2021-07-13 00:30:48 | Re: pgsql: Add PSQL_WATCH_PAGER for psql's \watch command. |
Previous Message | Tom Lane | 2021-07-12 23:17:53 | pgsql: Probe for preadv/pwritev in a more macOS-friendly way. |