From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <zsh-users-return-7050-mason-zsh=primenet.com.au@sunsite.dk>
Received: (qmail 3357 invoked from network); 13 Feb 2004 16:13:16 -0000
Received: from sunsite.dk (130.225.247.90)
  by ns1.primenet.com.au with SMTP; 13 Feb 2004 16:13:16 -0000
Received: (qmail 16271 invoked by alias); 13 Feb 2004 16:12:53 -0000
Mailing-List: contact zsh-users-help@sunsite.dk; run by ezmlm
Precedence: bulk
X-No-Archive: yes
X-Seq: 7050
Received: (qmail 16260 invoked from network); 13 Feb 2004 16:12:53 -0000
Received: from localhost (HELO sunsite.dk) (127.0.0.1)
  by localhost with SMTP; 13 Feb 2004 16:12:53 -0000
X-MessageWall-Score: 0 (sunsite.dk)
Received: from [62.189.58.19] by sunsite.dk (MessageWall 1.0.8) with SMTP; 13 Feb 2004 16:12:53 -0000
Received: from MAILSWEEPER01.csr.com (mailhost1.csr.com [62.189.183.235])
	by lhuumrelay3.lnd.ops.eu.uu.net (8.11.0/8.11.0) with ESMTP id i1DGCqv04821
	for <zsh-users@sunsite.dk>; Fri, 13 Feb 2004 16:12:52 GMT
Received: from EXCHANGE02.csr.com (unverified [192.168.137.45]) by 
    MAILSWEEPER01.csr.com (Content Technologies SMTPRS 4.3.12) with ESMTP id 
    <T67bc0f6239c0a88d012a4@MAILSWEEPER01.csr.com> for <zsh-users@sunsite.dk>
    ; Fri, 13 Feb 2004 16:12:36 +0000
Received: from tinky-winky ([192.168.144.127]) by EXCHANGE02.csr.com with 
    Microsoft SMTPSVC (5.0.2195.5329); Fri, 13 Feb 2004 16:13:40 +0000
Date: Fri, 13 Feb 2004 16:12:51 +0000
From: Peter Stephenson <pws@csr.com>
To: zsh-users@sunsite.dk
Subject: Re: |& loses data (buffering bug?)
Message-Id: <20040213161251.2588a9f2@tinky-winky>
In-Reply-To: <20040213154409.GL27168@greux.loria.fr>
References: <20040213141505.GG27168@greux.loria.fr> 
    <20040213143359.4ed3c3e5@tinky-winky> 
    <20040213144311.GJ27168@greux.loria.fr> 
    <20040213150016.1e64a843@tinky-winky> 
    <20040213153031.GK27168@greux.loria.fr> 
    <20040213154409.GL27168@greux.loria.fr>
Organization: Cambridge Silicon Radio Ltd.
X-Mailer: Sylpheed version 0.9.9claws (GTK+ 1.2.10; sparc-sun-solaris2.8)
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-OriginalArrivalTime: 13 Feb 2004 16:13:40.0249 (UTC) 
    FILETIME=[57E3D090:01C3F24C]

On Fri, 13 Feb 2004 16:44:09 +0100
Vincent Lefevre <vincent@vinc17.org> wrote:

> On 2004-02-13 16:30:31 +0100, Vincent Lefevre wrote:
> > On 2004-02-13 15:00:16 +0000, Peter Stephenson wrote:
> > > Can you get the same effect with e.g.
> > > 
> > >   perl -e 'open STDERR, ">&STDOUT";
> > >   open STDIN, "cvs status|";
> > > 
> > >   exec "less";'
> > > 
> > > which doesn't involve zsh at all?
>
> In fact, it doesn't do the same thing: STDERR is redirected to the
> terminal here.

You're right, the output from less is being redirected, not the output to
less.  Also, the tricks with pipes don't quite match what zsh is doing.
That's something more like:

perl -e 'pipe PIN, POUT;
if (fork) {
  close POUT;
  open STDIN, "<&PIN";
  close PIN;

  $_ = <STDIN>;
  exec "less";
} else {
  close PIN;
  open STDOUT, ">&POUT";
  open STDERR, ">&POUT";
  close POUT;

  $| = 1;
  print STDOUT "Sync\n";
  exec "cvs status";
}'

-- 
Peter Stephenson <pws@csr.com>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 692070


**********************************************************************
This email and any files transmitted with it are confidential and
intended solely for the use of the individual or entity to whom they
are addressed. If you have received this email in error please notify
the system manager.

This footnote also confirms that this email message has been swept by
MIMEsweeper for the presence of computer viruses.

www.mimesweeper.com
**********************************************************************