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Re: Hang in E01 due to zpty on OpenBSD

X-seq: zsh-workers 49978
From: Bart Schaefer <schaefer@xxxxxxxxxxxxxxxx>
To: Zsh hackers list <zsh-workers@xxxxxxx>
Subject: Re: Hang in E01 due to zpty on OpenBSD
Date: Sun, 3 Apr 2022 18:04:30 -0700
Archived-at: <https://zsh.org/workers/49978>
In-reply-to: <YkoUwETgsrrqDeZN@CptOrmolo.darkstar>
List-id: <zsh-workers.zsh.org>
References: <YkoUwETgsrrqDeZN@CptOrmolo.darkstar>

On Sun, Apr 3, 2022 at 2:43 PM Matthew Martin <phy1729@xxxxxxxxx> wrote:
>
> I assume the EPERM on open is an OpenBSD bug, but zsh should probably
> not hang either.

I'm not sure what could be done about this from the zsh code.  The
only reasonable assumption for the pty master-side reader is that the
slave-slide will become closed upon an error and the read will fail.
Using a non-blocking read would defeat the purpose.

I suppose we could skip the test on OpenBSD, but there are a bunch of
later tests that rely on zpty functioning.

Follow-Ups:
- Re: Hang in E01 due to zpty on OpenBSD
  - From: Matthew Martin

References:
- Hang in E01 due to zpty on OpenBSD
  - From: Matthew Martin

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