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Re: PATCH: Re: Multi-redirection bug

X-seq: zsh-workers 12223
From: Peter Stephenson <pws@xxxxxxxxxxxxxxxxxxxxxxxxx>
To: zsh-workers@xxxxxxxxxxxxxx (Zsh hackers list)
Subject: Re: PATCH: Re: Multi-redirection bug
Date: Tue, 11 Jul 2000 18:18:57 +0100
In-reply-to: "Your message of Tue, 11 Jul 2000 17:59:21 BST." <0FXJ00MQFLUXDK@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Mailing-list: contact zsh-workers-help@xxxxxxxxxxxxxx; run by ezmlm

I wrote:
> The SIGPIPE is inevitable, but the shell usually doesn't exit on
> it, so there may be something else wrong.

This may be nonsense.

% (echo foo; sleep 1; echo bar >& 2) | (read >/dev/null)
bar
% (echo foo; sleep 1; echo foo2; echo bar >& 2) | (read >/dev/null)
% print $pipestatus                                                
141 0

The sleep is necessary so that the read process has really exited (`by a
sleep to say we end the heartache' etc.).  In that case the shell process
does get SIGPIPE (13 on Solaris + 128 for a signal) and exit.

Still, it worries me that it can be so drastically affected by the
behaviour of trivial subprocesses like the multios helpers.

-- 
Peter Stephenson <pws@xxxxxxxxxxxxxxxxxxxxxxxxx>
Cambridge Silicon Radio, Unit 300, Science Park, Milton Road,
Cambridge, CB4 0XL, UK                          Tel: +44 (0)1223 392070

References:
- PATCH: Re: Multi-redirection bug
  - From: Peter Stephenson

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