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bug with named pipes and process substitution

X-seq: zsh-workers 35847
From: Petros Aggelatos <petrosagg@xxxxxxxxx>
To: zsh-workers@xxxxxxx
Subject: bug with named pipes and process substitution
Date: Tue, 21 Jul 2015 17:25:15 -0700
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Hi all,

I encountered a bug when running the following two commands:

mkfifo test_pipe
echo 1 | tee >(cat > test_pipe) | paste - test_pipe

In bash and zsh 5.0.2 it outputs "1 1" and then exits. In zsh 5.0.8
however, it outputs the same thing and hangs forever.

I bisected the repo for the commit that introduced this behaviour and
it was introduced in 3c5732223f65309c6820f15b8519f674bd21185b which
includes the patch from this thread
http://www.zsh.org/mla/workers/2013/msg00569.html

I haven't yet figured out how and what, since I'm not very familiar
with the codebase. I'll try to figure out a patch but if someone can
shed some light on what is going on that would be great.

System info:

$ echo $ZSH_VERSION $ZSH_PATCHLEVEL `uname -mo`
5.0.8 zsh-5.0.8-0-gf0068ed x86_64 GNU/Linux

Best,
Petros

Follow-Ups:
- Re: bug with named pipes and process substitution
  - From: Peter Stephenson

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