From: Matthew Leach <matthew@mattleach.net>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 37564@debbugs.gnu.org
Subject: bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications
Date: Fri, 04 Oct 2019 19:47:41 +0100 [thread overview]
Message-ID: <87d0fcjqk2.fsf@mattleach.net> (raw)
In-Reply-To: <83sgob98zk.fsf@gnu.org> (Eli Zaretskii's message of "Wed, 02 Oct 2019 05:28:15 +0300")
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Matthew Leach <matthew@mattleach.net>
>> Cc: 37564@debbugs.gnu.org
>> Date: Tue, 01 Oct 2019 20:24:14 +0100
>>
>> > I simply tried "env | fgrep LINES" and I do see the variable, although
>> > it wasn't there before I launched Emacs.
>>
>> I would expect the variable to be there when inside Emacs as it has
>> exported it. You should find that it won't exist if ran outside Emacs,
>> for example in xterm.
>
> Sorry, I'm confused. Are we talking about running "M-x term" inside
> Emacs, or are we talking about something else? The subject of the bug
> report says "term", so I assumed you mean term-mode.
Indeed, I'm talking about term-mode (M-x term). Sorry if I didn't make
that clear.
>> Ah, indeed if I try and resize and print the variable it has updated:
>>
>> matthew@hopton ~ $ env | grep -i lines
>> LINES=30
>> matthew@hopton ~ $ env | grep -i lines
>> LINES=12
>>
>> I think the issue is that the environment can't be while a process is
>> running; the environment variables are fixed when the program has
>> started. For a ncurses application this presents a problem as LINES and
>> COLUMNS can't be updated when the window size is changed and the program
>> handles a SIGWINCH. You can see that on the output above.
>
> While the process is running, Emacs sends ioctl commands to
> communicate the window size changes.
Sure but by exporting LINES and COLUMNS (something that other terminal
emulators don't do) programs aren't picking up changes in the window
size.
--
Matt
next prev parent reply other threads:[~2019-10-04 18:47 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-30 19:59 bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications Matthew Leach
2019-10-01 6:01 ` Eli Zaretskii
2019-10-01 15:47 ` Matthew Leach
2019-10-01 16:07 ` Eli Zaretskii
2019-10-01 18:33 ` Matthew Leach
2019-10-01 18:58 ` Eli Zaretskii
2019-10-01 19:14 ` Eli Zaretskii
2019-10-01 19:24 ` Matthew Leach
2019-10-02 2:28 ` Eli Zaretskii
2019-10-03 17:51 ` Glenn Morris
2019-10-04 18:48 ` Matthew Leach
2020-01-20 19:10 ` Stefan Kangas
2020-01-20 19:30 ` Eli Zaretskii
2020-01-21 0:58 ` Glenn Morris
2020-01-21 17:11 ` Eli Zaretskii
2020-01-21 18:10 ` Matthew Leach
2020-01-22 3:38 ` Glenn Morris
2020-01-22 15:46 ` Eli Zaretskii
2020-06-04 16:01 ` Glenn Morris
2020-08-15 12:37 ` Lars Ingebrigtsen
2020-01-24 18:08 ` Stefan Kangas
2020-01-21 3:04 ` Stefan Kangas
2019-10-04 18:47 ` Matthew Leach [this message]
2019-10-07 4:11 ` Lars Ingebrigtsen
2019-10-07 9:16 ` Andreas Schwab
2019-10-08 16:38 ` Lars Ingebrigtsen
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