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Subject: bug#47535: 27.2; comint shell hangs on long input
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: David Biesack <David.Biesack@HIDDEN>
Subject: bug#47535: Acknowledgement (27.2; comint shell hangs on long input)
Message-ID: <handler.47535.B.16172295887166.ack <at> debbugs.gnu.org>
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Date: Wed, 31 Mar 2021 22:27:02 +0000

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47535: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D47535
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#47535: 27.2; comint shell hangs on long input
Resent-From: Andreas Schwab <schwab@HIDDEN>
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From: Andreas Schwab <schwab@HIDDEN>
References: <2A7C721B-CDCD-47BF-942A-1B75DDBC12D2@HIDDEN>
Date: Thu, 01 Apr 2021 10:04:05 +0200
In-Reply-To: <2A7C721B-CDCD-47BF-942A-1B75DDBC12D2@HIDDEN> (David Biesack
 via's message of "Wed, 31 Mar 2021 22:11:18 +0000")
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On Mär 31 2021, David Biesack via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> Start Emacs with emacs -Q
>
> M-x shell
>
> in the shell buffer, enter
>
> echo <C-u> 1 0 0 0 x <Return>
>
> to echo 1,000 x's. Works fine.
>
> echo <C-u> 1 0 2 4 x <Return>
>
> to echo 1,024 x's. The shell buffer prints the command, then "hangs" and
> the output is never printed, and the command prompt not issued. no
> character input works (Return, etc.)

That's a limitation of the BSD tty interface.  Once the input buffer is
full, no more characters can be sent, not even a newline or the EOF
character.  The Linux tty interface instead discards further input until
the newline or EOF.

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#47535: 27.2; comint shell hangs on long input
Resent-From: Andreas Schwab <schwab@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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To: 47535 <at> debbugs.gnu.org
Cc: David.Biesack@HIDDEN
From: Andreas Schwab <schwab@HIDDEN>
References: <2A7C721B-CDCD-47BF-942A-1B75DDBC12D2@HIDDEN>
Date: Thu, 01 Apr 2021 10:04:05 +0200
In-Reply-To: <2A7C721B-CDCD-47BF-942A-1B75DDBC12D2@HIDDEN> (David Biesack
 via's message of "Wed, 31 Mar 2021 22:11:18 +0000")
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On Mär 31 2021, David Biesack via "Bug reports for GNU Emacs, the Swiss army knife of text editors" wrote:

> Start Emacs with emacs -Q
>
> M-x shell
>
> in the shell buffer, enter
>
> echo <C-u> 1 0 0 0 x <Return>
>
> to echo 1,000 x's. Works fine.
>
> echo <C-u> 1 0 2 4 x <Return>
>
> to echo 1,024 x's. The shell buffer prints the command, then "hangs" and
> the output is never printed, and the command prompt not issued. no
> character input works (Return, etc.)

That's a limitation of the BSD tty interface.  Once the input buffer is
full, no more characters can be sent, not even a newline or the EOF
character.  The Linux tty interface instead discards further input until
the newline or EOF.

Andreas.

-- 
Andreas Schwab, schwab@HIDDEN
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

Message sent to bug-gnu-emacs@HIDDEN:

X-Loop: help-debbugs@HIDDEN
Subject: bug#47535: 27.2; comint shell hangs on long input
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To: Andreas Schwab <schwab@HIDDEN>
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From: Lars Ingebrigtsen <larsi@HIDDEN>
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Date: Sat, 08 May 2021 13:52:16 +0200
In-Reply-To: <87pmzetoqy.fsf@HIDDEN> (Andreas Schwab's message of "Thu, 01
 Apr 2021 10:04:05 +0200")
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 Content preview:  Andreas Schwab <schwab@HIDDEN> writes: > That's a
 limitation of the BSD tty interface. Once the input buffer is > full, no more
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Andreas Schwab <schwab@HIDDEN> writes:

> That's a limitation of the BSD tty interface.  Once the input buffer is
> full, no more characters can be sent, not even a newline or the EOF
> character. 

Is this something that can be fixed in Emacs, then?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Last modified: Sat, 8 May 2021 12:00:02 UTC

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