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From: Bart Schaefer <schaefer@brasslantern.com>
Message-id: <101126093810.ZM25915@torch.brasslantern.com>
Date: Fri, 26 Nov 2010 09:38:10 -0800
In-reply-to: <20101126115148.GT1254@prunille.vinc17.org>
Comments: In reply to Vincent Lefevre <vincent@vinc17.net>
 "PROMPT_SP bug with local in precmd" (Nov 26, 12:51pm)
References: <20101126115148.GT1254@prunille.vinc17.org>
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To: zsh-workers@zsh.org
Subject: Re: PROMPT_SP bug with local in precmd
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On Nov 26, 12:51pm, Vincent Lefevre wrote:
}
} ypig% precmd() { local v=bar }  
} ypig% echo -n foo; false      
} foozsh: exit 1

It's not "local" that triggers this, it's any command:

torch% precmd() { : }
torch% echo -n foo; false
foozsh: exit 1
torch% precmd() { echo -n Hi }
Hi%
torch% echo -n foo; false
foozsh: exit 1
Hi%
torch% precmd() { /bin/echo -n Hi }
Hi%
torch% echo -n foo; false
foozsh: exit 1
Hi%
zsh: exit 1
torch% 


This makes me suspect it's not so much a bug as a race condition -- when
there is a command in precmd, the order in which the exit values from
children (even fake children) are collected and reported is changed.
Note how "zsh: exit 1" is printed twice when the precmd is a forked
process instead of all builtins.

My conclusion from this is that "foozsh: exit 1" is what you really
ought to be seeing all the time, and "zsh: exit 1" on its own line is a
side-effect of a stdio buffer never having been flushed.