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Re: Regression with stdin handling in non-interactive mode between 5.8 and 5.8.1

X-seq: zsh-workers 49789
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: Lyude Paul <lyude@xxxxxxxxxx>
Cc: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: Re: Regression with stdin handling in non-interactive mode between 5.8 and 5.8.1
Date: Wed, 2 Mar 2022 14:59:13 -0800
Archived-at: <https://zsh.org/workers/49789>
In-reply-to: <5e9cdfc2b807bfc4aa4695938b70156742c2e120.camel@redhat.com>
List-id: <zsh-workers.zsh.org>
References: <5e9cdfc2b807bfc4aa4695938b70156742c2e120.camel@redhat.com>

On Wed, Mar 2, 2022 at 2:39 PM Lyude Paul <lyude@xxxxxxxxxx> wrote:
>
>
>    printf '%s\n' 'echo Shell is $$' sh 'echo Shell is $$' | zsh
>
> Running on zsh 5.8.1 however, returns:
>
>    Shell is 86396
>    Shell is 86396

This has to be workers/49290, the replacement I/O buffering is not
doing line-buffered input for non-interactive shells.  An strace shows

read(0, "echo Shell is $$\nsh\necho Shell i"..., 8192) = 37

References:
- Regression with stdin handling in non-interactive mode between 5.8 and 5.8.1
  - From: Lyude Paul

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