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Subject: Re: Cygwin doesn't handle SIGWINCH properly in Windows Terminal
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From: Thomas Wolff <towo@towo.net>
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Date: Tue, 16 Feb 2021 11:26:38 +0100
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Am 16.02.2021 um 07:20 schrieb Brian Inglis:
> On 2021-02-15 22:48, Marco Atzeri via Cygwin wrote:
>> On 16.02.2021 03:17, L A Walsh wrote:
>>> On 2021/02/14 16:05, Takashi Yano wrote:
>>>> On Sun, 14 Feb 2021 12:44:32 -0800
>>>> L A Walsh wrote:
>>>>> showsize () {\
>>>>>   declare s=$(stty size); s="(${s// /x})"  ;\
>>>>>   printf "%s" "$s${s//?/$'\b'}"       ;\
>>>>> }; export -f showsize
>>>>>
>>>>> trap showsize SIGWINCH
I have a similar trap in my .bashrc and it's being triggered when 
running bash from either cmd (conhost) or Windows Terminal and resizing 
them. Did I miss something in this issue?

>
>>>> What do you mean by "reset LINES/COLUMNS"? I am not sure what
>>>> is the behaviour diffrence in Linux and cygwin you mentioned.
>
>>>      Actually not sure I can reproduce this now.  The only
>>> thing I am noticing is that if bash is attached to /dev/pts3
>>> (as in mintty), it works, but if attached to /dev/cons0 (as in
>>> cmd.exe), nothing works as no signal is propagated from
>>> the window resize to running program.
>>>
>>>      AFAIK, though, that's always been one of multiple probs in 
>>> using windows cmd with a bash shell.
>
>> maybe this is waht you are looking for:
>>
>> # This causes bash to check the terminal size after every command
>> # and adjusts $LINES and $COLUMNS to the correct values.
>> shopt -s checkwinsize
>
> Newer bash man pages say this is the default; set in my .bashrc so I 
> can't tell; bash man pages also say COLUNS and LINES are set on 
> SIGWINCH if interactive:
>
> $ man bash | egrep -A1 'COLUMNS|LINES|checkwinsize'
> COLUMNS
>     Used by the select compound command to determine the terminal 
> width when
>     printing selection lists. Automatically set if the checkwinsize 
> option
>     is enabled or in an interactive shell upon receipt of a SIGWINCH.
> -- 
> LINES    Used by the select compound command to determine the column 
> length for
>     printing selection lists. Automatically set if the checkwinsize 
> option
>     is enabled or in an interactive shell upon receipt of a SIGWINCH.
> -- 
> checkwinsize
>     If set, bash checks the window size after each command and, if
>     necessary, updates the values of LINES and COLUMNS.
>

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