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* [BUG] last builtin command in a subshell and trap
@ 2021-07-01 13:32 Vincent Lefevre
  0 siblings, 0 replies; only message in thread
From: Vincent Lefevre @ 2021-07-01 13:32 UTC (permalink / raw)
  To: zsh-workers

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)


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2021-07-01 13:32 [BUG] last builtin command in a subshell and trap Vincent Lefevre

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