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From: Bart Schaefer <schaefer@brasslantern.com>
Message-Id: <160416093433.ZM24261@torch.brasslantern.com>
Date: Sat, 16 Apr 2016 09:34:33 -0700
In-Reply-To: <20160416075941.GA27994@ofb.net>
Comments: In reply to frederik@ofb.net
        "exec redirect prevents trap" (Apr 16, 12:59am)
References: <20160416075941.GA27994@ofb.net>
To: frederik@ofb.net, zsh-workers@zsh.org
Subject: Re: exec redirect prevents trap
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On Apr 16, 12:59am, frederik@ofb.net wrote:
}
}     #!/bin/zsh
}     exec > >(tee -a /tmp/foo)
}     trap "echo hi" INT TERM EXIT
}     sleep 1d;
} 
} When I run it and hit ^C, it doesn't print anything. But when I remove
} the "exec" line and do the same, it prints "hi".

I suspect what you have here is a race condition.  When zsh exits,
it first sends a HUP signal to all its children, including the tee
process.  If tee dies before the exit trap runs, the "hi" will go
nowhere.

Try one of these:

    exec > >(trap '' HUP; tee -a /tmp/foo)

    exec > >(tee -a /tmp/foo &! )