Re: dynamic conpty loading

Hi Brian,

Am 05.12.2025 um 21:05 schrieb Brian Inglis via Cygwin:
> On 2025-12-05 02:52, Takashi Yano via Cygwin wrote:
>> Hi Corinna,
>> Thanks for the comment.
>> On Thu, 4 Dec 2025 12:01:58 +0100
>> Corinna Vinschen wrote:
>>> On Dec  3 17:56, Takashi Yano via Cygwin wrote:
>>>> Subject: [PATCH v2] Cygwin: pty: Experimental OpenConsole.exe support
>>> Some commit message here?  Yeah, I know, it's just experimental for 
>>> now :)
>>>
>>>> Signed-off-by: Takashi Yano <[email protected]>
>>>> +  size_t towrite = len;
>>>> +
>>>>     ssize_t ret;
>>>>     char *p = (char *) ptr;
>>>>     termios &ti = tc ()->ti;
>>>> @@ -2152,7 +2284,7 @@ fhandler_pty_master::write (const void *ptr, 
>>>> size_t len)
>>>>        If the reply for "CSI6n" is divided into multiple writes,
>>>>        pseudo console sometimes does not recognize it. Therefore,
>>>>        put them together into wpbuf and write all at once. */
>>>> -      static const int wpbuf_len = strlen ("\033[32768;32868R");
>>>> +      static const int wpbuf_len = 64; /* for response to CSI6n 
>>>> nad CSIc */
>>>
>>> Is there some macro for the count of 64 in this context, by any chance?
>>
>> I'm not sure for now that 64 is really enough for the responce to ESC[c.
>> mintty returns about 30 byte responce. But some other terminal may 
>> return
>> longer responce.
>
> https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h4-Functions-using-CSI-_-ordered-by-the-final-character-lparen-s-rparen:CSI-Ps-c.1CA3 
>
>
> Responses include \e [ ? # # c 6 for base ctl seq plus term type e.g. 
> 64 from mintty; plus ";" separated attributes up to 7 (round to 8) 
> each single digit and 8 double digit => 6 + 16 + 24 <= 46
> e.g. for mintty \e[?64;1;2;4;6;9;11;15;21;22;28;29c => 6 + 10 + 18 = 34
This calculation is obscure to me. Each number after the "64" base 
indication (meaning VT420 compability level) indicates a certain feature 
as listed in DEC docs. Well, descriptions of some of them are also obscure.
>
> Could default to column width if longer to allow room for prompts and 
> titles; max parameter value lengths are 5 digits; text strings may be 
> longer; querying 8/16/88/256 colour palettes or similar could require 
> more space.
Escape sequences are not related to column width. \e[ are "CSI" escape 
sequences and their parameter must be numbers only (by ECMA-48 «Control 
Functions for Coded Character Sets»).

>
>>>> if [ $(uname -m) = "x86_64" ]
>>>> then
>>>>     POSTFIX="x64"
>>>> else
>>>>     POSTFIX="x86"
>>>
>>> Do we really want a 32 bit version?  Isn't there an aarch64 version?
>>
>> No. What should we assume result of "uname -m" in aarch64 machine?
>
> WSL should work on ARM and reports of uname say aarch64.

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