bug#24531: bug#6149: bug#24531: process-send-string seems to truncate lines over 4096 characters

[Eli Zaretskii]

> Date: Thu, 27 Jul 2023 04:48:18 +0300
> Cc: 24531@debbugs.gnu.org, 6149@debbugs.gnu.org,
>  Stefan Monnier <monnier@iro.umontreal.ca>, jidanni@jidanni.org
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> If some syscall or etc limits the length of a string to 4096, can't we 
> detect this case, split the string and emit said call multiple times?
> 
> This function's docstring already mentions the case of
> 
>    If STRING is larger than the input buffer of the process, ...
>    it is sent in several bunches

AFAIU, that is based on the errno value returned by a 'write' call
which attempts to write too many bytes (see the would_block function).
I guess writes to PTYs don't do that?

Paul, do you know anything about that?