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Subject: Re: [ANNOUNCEMENT] Updated: dash-0.5.8-3
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From: Thomas Wolff <towo AT towo DOT net>
Message-ID: <59ecea04-2e3c-41af-9f4a-93a9b772a9e4@towo.net>
Date: Wed, 15 Feb 2017 23:19:01 +0100
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Am 14.02.2017 um 21:35 schrieb Thomas Wolff:
> Am 14.02.2017 um 21:29 schrieb Thomas Wolff:
>> Am 14.02.2017 um 20:56 schrieb Eric Blake:
>>> On 02/14/2017 01:40 PM, Thomas Wolff wrote:
>>>>> No.  We're talking about a function in the master side of the tty, 
>>>>> while
>>>>> the applications started in the terminal are on the slave side.
>>>> I am not familiar with the concept of setting termios properties on
>>>> either the master or slave side of a pty. I've only ever set them 
>>>> in the
>>>> client application, including my tests about IUTF8 which worked. Would
>>>> setting on the master side imply it's set for the clients implicitly,
>>>> and can it be changed later, e.g. when mintty character encoding is
>>>> being changed from the Options dialog?
>>>> And you say the function of erasing characters on BS is in the master
>>>> side? To be honest, this confuses me. I thought it's a client 
>>>> function,
>>>> like readline() would perform if used (apparently not by dash), 
>>>> which is
>>>> kind of an enhanced version of the tty cooked mode and used to work 
>>>> even
>>>> without the new flag, right?
>>> The readline source code does not mention IUTF8; and neither bash nor
>>> dash need to reference it, because if the tty handling code sets it
>>> correctly for what the terminal is going to display, then the clients
>>> that are read()ing from the tty never even see BS in cooked mode (the
>>> master side of the terminal handles BS before the read() completes in
>>> the slave, if I'm understanding it correctly).
>> This does not comply with my (limited) understanding of pty stuff. In 
>> mintty, forkpty will create a master/slave pty; mintty feeds it on 
>> the master side, while the client program (usually a shell) reads 
>> from the slave side. Mintty never handles BS for input, it simply 
>> feeds it into the pty. "Line disciplines" like cooked mode must be 
>> handled on the slave side.
> Also, I've tried both options in mintty. Setting the flag on the 
> master side has weird effects, initially blocking the terminal process.
> Setting it on the slave side works fine.
That was a mistake (got something wrong when testing). It works from 
either side alike.
I've now patched mintty to keep the flag in sync with the character 
encoding, including on later changes (from Options menu or by escape 
sequence).
------
Thomas

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