Date: Sat, 23 Jan 2010 15:23:51 +0100
From: Corinna Vinschen <corinna-cygwin@cygwin.com>
To: cygwin@cygwin.com
Subject: Re: Bash process substitution
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On Jan 23 12:07, Corinna Vinschen wrote:
> On Jan 22 18:46, Dave wrote:
> > Is process substitution expected to work in 1.7.1?
> > 
> > Here's what I tried:
> > 
> > kilroyd@MINIME ~
> > $ uname -a
> > CYGWIN_NT-5.1 MINIME 1.7.1(0.218/5/3) 2009-12-07 11:48 i686 Cygwin
> > 
> > kilroyd@MINIME ~
> > $ echo LOG:bananas | tee file.txt
> > LOG:bananas
> > 
> > kilroyd@MINIME ~
> > $ cat file.txt
> > LOG:bananas
> > 
> > kilroyd@MINIME ~
> > $ echo LOG:bananas | tee >(grep "^LOG:" > file.txt)
> > LOG:bananas
> > tee: /dev/fd/63: Bad file descriptor
> 
> I'm not quite sure how this command works under the hood, but it's
> possible that this can't work in Cygwin due to a restriction in
> Windows.  In contrast to Unix, you can't call open(pipe_fd, O_RDONLY)
> if pipe_fd is the write side of a pipe and vice versa.  If bash's
> process substitution relies on that, it's simply not possible.
> Dunno if there is a way to implement this using some hackery, of course...

Hang on, this is a EBADF.  Looks like bash tries to access a file
descriptor which isn't available (anymore).

Eric, would you mind to have a look into bash to examine what's going
on here?


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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