From: Vincent Lefevre <vincent@vinc17.net>
To: zsh-workers@zsh.org
Subject: [BUG] last builtin command in a subshell and trap
Date: Thu, 1 Jul 2021 15:32:04 +0200 [thread overview]
Message-ID: <20210701133204.GA1377664@zira.vinc17.org> (raw)
With zsh 5.8, the SIGPIPE trap is not executed when the builtin that
generates it is the last command of a subshell:
zira% ( trap 'echo PIPE >&2' PIPE; sleep 1; pwd; ) | :
zsh: write error: broken pipe
With an additional command (builtin), this is OK:
zira% ( trap 'echo PIPE >&2' PIPE; sleep 1; pwd; :; ) | :
zsh: write error: broken pipe
PIPE
I wonder whether this is related to the (undocumented?) optimization
that exec's the last command of a subshell / shell script (though
this is not applicable to builtins).
There is the same issue with mksh, but not with dash, ksh93, bash and
yash.
--
Vincent Lefèvre <vincent@vinc17.net> - 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)
reply other threads:[~2021-07-01 13:32 UTC|newest]
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