From: Brian Candler <B.Candler@...>
Date: 2003-05-12T23:49:34+09:00
Subject: Re: RCR for child execution

On Mon, May 12, 2003 at 09:01:19PM +0900, Simon Strandgaard wrote:
> > I mean, I'm guessing you want something like '$deferr' like '$defout',
> > right? So that rb_warn sends to $deferr, and you can map this variable to
> > point to some other object?
> 
> I see no reason to introduce a '$deferr'... But this could be possible 
> sideeffect of this.
> rb_warn outputs to stderr, perhaps it should output to rb_stderr ?

It's the same thing at the moment, because rb_stderr just encapsulates
stderr.

When you do
        $stderr = File.new("/tmp/foo")
then the underlying Unix stderr is reopened to point to /tmp/foo. Try it. So
they are always kept in sync.

> > - It doesn't follow the Unix API model, therefore violates POLS:
> >   "system" should not create pipes to the child. "popen" should.
> 
> Disagree!  
> What is POLS ?  
> where can I read more about the standard Unix API model ?

"The Principle of Least Surprise"

For the Unix API model, the best introduction and reference I have found is
the Stevens book.

Brian.