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Date: Fri, 30 Jan 2015 09:59:19 +0000
From: Stephane Chazelas <stephane.chazelas@gmail.com>
To: Zsh hackers list <zsh-workers@zsh.org>
Subject: mult_ios with "exec"
Message-ID: <20150130095918.GA5545@chaz.gmail.com>
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zsh -c 'exec 3> a 3> b; echo never reached'

That command hangs.

strace shows zsh stuck on:

rt_sigsuspend([INT])

Same with >>, not with < or <> (though I suppose mult_ios
doesn't apply to <> or is equivalent to < there).

Note:

$ zsh -c 'eval exec 3> a 3> b; echo test >&3'
zsh:1: 3: bad file descriptor

(same with other shells (except the Bourne shell)).

zsh -c 'exec 3> >(tee a > b); echo reached'

is OK.

-- 
Stephane