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[BUG] builtins with bad file descriptor can hang the shell

X-seq: zsh-workers 49051
From: Vincent Lefevre <vincent@xxxxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: [BUG] builtins with bad file descriptor can hang the shell
Date: Thu, 10 Jun 2021 10:25:50 +0200
Archived-at: <https://zsh.org/workers/49051>
List-id: <zsh-workers.zsh.org>
Mail-followup-to: zsh-workers@xxxxxxx

The following first 3 commands are OK. The 4th one hangs zsh,
with Ctrl-C and Ctrl-\ having no effect. This happens whether
MULTIOS is set or not.

zira% echo >&- > >(cat -n)
     1
zira% echo >&2 > >(cat -n)

     1
zira% /bin/echo >&3 > >(cat -n)
zsh: 3: bad file descriptor
zira% echo >&3 > >(cat -n)
zsh: 3: bad file descriptor

-- 
Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

Follow-Ups:
- Re: [BUG] builtins with bad file descriptor can hang the shell
  - From: Bart Schaefer

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