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bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fi
From: |
Matthew Leach |
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 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
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
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Eli Zaretskii, 2019/10/01
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Matthew Leach, 2019/10/01
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Eli Zaretskii, 2019/10/01
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Matthew Leach, 2019/10/01
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Eli Zaretskii, 2019/10/01
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Eli Zaretskii, 2019/10/01
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Matthew Leach, 2019/10/01
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Eli Zaretskii, 2019/10/01
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Glenn Morris, 2019/10/03
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Matthew Leach, 2019/10/04
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications,
Matthew Leach <=
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Lars Ingebrigtsen, 2019/10/07
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Andreas Schwab, 2019/10/07
- bug#37564: [PATCH] don't export LINES and COLUMNS env vars in term to fix ncurses applications, Lars Ingebrigtsen, 2019/10/08