From: Neil Jerram <neil@ossau.homelinux.net>
To: Mark H Weaver <mhw@netris.org>,
geiser-users@nongnu.org, emacs-orgmode@gnu.org
Cc: 33403@debbugs.gnu.org
Subject: Re: bug#33403: [Geiser-users] Data length limit in Guile/Geiser/Scheme evaluation
Date: Fri, 16 Nov 2018 11:16:56 +0000 [thread overview]
Message-ID: <875zwx1dcn.fsf@ossau.homelinux.net> (raw)
In-Reply-To: <878t1t1ety.fsf@ossau.homelinux.net>
Neil Jerram <neil@ossau.homelinux.net> writes:
> Mark H Weaver <mhw@netris.org> writes:
>
>> This is a documented limitation in Linux's terminal handling when in
>> canonical mode. See the termios(3) man page, which includes this text:
>>
>> Canonical and noncanonical mode
>>
>> The setting of the ICANON canon flag in c_lflag determines
>> whether the terminal is operating in canonical mode (ICANON set)
>> or noncanonical mode (ICANON unset). By default, ICANON is set.
> [...]
>> * The maximum line length is 4096 chars (including the
>> terminating newline character); lines longer than 4096 chars
>> are truncated. After 4095 characters, input processing (e.g.,
>> ISIG and ECHO* processing) continues, but any input data after
>> 4095 characters up to (but not including) any terminating
>> newline is discarded. This ensures that the terminal can
>> always receive more input until at least one line can be read.
>>
>> Note that last item above.
>
> Awesome; thank you Mark.
>
> So possibly this limit can be removed, in my Org/Geiser context, by
> evaluating (system* "stty" "-icanon") when initializing the Geiser-Guile
> connection. I'll try that. Will the terminal that that 'stty' sees be
> the same as Guile's stdin?
>
> Jao, if that works, I wonder if it should be the default for Geiser? It
> appears to me that Geiser shouldn't ever need the features of canonical
> mode. Is that right?
>
> Anyway, I'll see first if the stty call is effective.
Yes, with this in my ~/.guile-geiser -
(system* "stty" "-icanon")
- I can do evaluations past the 4K line length limit, and the Org-driven
problem that I first reported [1] has disappeared.
Thanks to Nicolas, Jao and Mark for your help in understanding this.
Neil
[1] https://lists.gnu.org/archive/html/emacs-orgmode/2018-11/msg00177.html
next prev parent reply other threads:[~2018-11-16 11:17 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-15 14:21 Data length limit in Guile/Geiser/Scheme evaluation Neil Jerram
2018-11-15 14:26 ` Neil Jerram
2018-11-15 15:20 ` Nicolas Goaziou
2018-11-15 16:04 ` Neil Jerram
[not found] ` <87h8gi1g5g.fsf-mq78CtbEgnGjF4gvJNWmbtHuzzzSOjJt@public.gmane.org>
2018-11-15 17:01 ` Jose A. Ortega Ruiz
2018-11-15 17:32 ` [Geiser-users] " Neil Jerram
[not found] ` <87bm6q1c33.fsf-mq78CtbEgnGjF4gvJNWmbtHuzzzSOjJt@public.gmane.org>
2018-11-15 23:17 ` Jose A. Ortega Ruiz
[not found] ` <87o9aq55tl.fsf@ossau.homelinux.net>
[not found] ` <87d0r5349t.fsf@netris.org>
[not found] ` <87y39t1olc.fsf@netris.org>
[not found] ` <878t1t1ety.fsf@ossau.homelinux.net>
2018-11-16 11:16 ` Neil Jerram [this message]
[not found] ` <875zwx1dcn.fsf-mq78CtbEgnGjF4gvJNWmbtHuzzzSOjJt@public.gmane.org>
2018-11-16 23:12 ` bug#33403: " Jose A. Ortega Ruiz
2018-11-17 7:09 ` Mark H Weaver
[not found] ` <87zhu8w55u.fsf-StlzRsPvAncdnm+yROfE0A@public.gmane.org>
2018-11-17 7:31 ` Mark H Weaver
2018-11-17 14:59 ` Jose A. Ortega Ruiz
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