From: Roman Perepelitsa <roman.perepelitsa@gmail.com>
To: Millian Poquet <millian.poquet@irit.fr>
Cc: zsh-workers@zsh.org
Subject: Re: [bug report] prompt can erase messages written on the terminal by background processes
Date: Wed, 7 Dec 2022 23:55:17 +0100 [thread overview]
Message-ID: <CAN=4vMq2kc1cSV_0N-c6o32C3UR3hVSjE3mF+kV4pjcy7YR9=g@mail.gmail.com> (raw)
In-Reply-To: <9e3026aa-39a1-dd50-4d29-a64724d4eaaf@irit.fr>
On Wed, Dec 7, 2022 at 8:04 PM Millian Poquet <millian.poquet@irit.fr> wrote:
>
> prompt can erase messages written on the terminal by background processes
Not just prompt but zle in general, or any program really that moves
the cursor (try `top`, for example, or `less`). There is no way around
it. Zle assumes that nobody else prints to the terminal. If this
assumption is violated, the outcome is unspecified mess.
Here's a simpler demonstration. Run this in interactive zsh:
( sleep 3; print -rn hello ) &!
Then immediately type "ls" and wait without hitting enter. A moment
later "hello" will appear on the command line. Try editing it and
observe that zle is essentially broken.
You can break any terminal program that moves the cursor by using this
trick. Try running `top` immediately after the command listed above,
or after you C program, which is essentially the same.
Roman.
next prev parent reply other threads:[~2022-12-07 22:56 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-12-07 19:02 Millian Poquet
2022-12-07 22:55 ` Roman Perepelitsa [this message]
2022-12-08 3:46 ` Bart Schaefer
2022-12-08 8:21 ` Get cursor position (Was: [bug report] prompt can erase messages written on the terminal by background processes) Stephane Chazelas
2022-12-08 8:34 ` Roman Perepelitsa
2022-12-08 10:02 ` Stephane Chazelas
2022-12-08 10:10 ` Stephane Chazelas
2022-12-08 10:19 ` Mikael Magnusson
2022-12-09 2:19 ` Bart Schaefer
2022-12-09 12:46 ` Philippe Altherr
2022-12-10 4:30 ` Bart Schaefer
2022-12-10 14:55 ` Private variables not private enough? (Was: Get cursor position (Was: [bug report] prompt can erase messages written on the terminal by background processes)) Philippe Altherr
2022-12-10 17:36 ` Bart Schaefer
2022-12-10 20:38 ` Bart Schaefer
2022-12-11 18:00 ` Get cursor position (Was: [bug report] prompt can erase messages written on the terminal by background processes) Stephane Chazelas
2022-12-09 1:39 ` Bart Schaefer
2022-12-08 8:45 ` [bug report] prompt can erase messages written on the terminal by background processes Roman Perepelitsa
2022-12-08 15:03 ` Oliver Kiddle
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