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Date: Mon, 13 May 2013 18:25:27 -0700
Message-ID: <CAH+w=7ZVL_wx2ZUiU5ZQKFzosG4YENWA5bQ-ovtNMrOuJ1W2WQ@mail.gmail.com>
Subject: Re: zpty -r and pipes
From: Bart Schaefer <schaefer@brasslantern.com>
To: Zsh hackers list <zsh-workers@zsh.org>
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On Mon, May 13, 2013 at 8:27 AM, Stephane Chazelas
<stephane.chazelas@gmail.com> wrote:
>
> $ zsh -c 'zmodload zsh/zpty; zpty E echo test; zpty -r E | cat'
> $
>
> No output.

Check the exit status:

% zsh -c 'zmodload zsh/zpty; zpty E echo test; zpty -r E | cat &&
print $pipestatus'
1 0
%

"zpty -r" is failing.  I wonder if this is another case of a read()
being interrupted by a signal?  It seems to be a race, I can affect it
by inserting a sleep:

% zsh -c 'zmodload zsh/zpty; zpty E echo test; (zpty -r E) | cat'
test
% zsh -c 'zmodload zsh/zpty; zpty E echo test; {sleep 1; zpty -r E} | cat'
% zsh -c 'zmodload zsh/zpty; zpty E echo test; {zpty -r E; sleep 1} | cat'
test