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Date:	Sat, 23 Jan 2010 14:03:43 -0500
From:	Christopher Faylor <cgf-use-the-mailinglist-please AT cygwin DOT com>
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Subject:	Re: Bash process substitution
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On Sat, Jan 23, 2010 at 12:07:19PM +0100, 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 AT MINIME ~
>> $ uname -a
>> CYGWIN_NT-5.1 MINIME 1.7.1(0.218/5/3) 2009-12-07 11:48 i686 Cygwin
>> 
>> kilroyd AT MINIME ~
>> $ echo LOG:bananas | tee file.txt
>> LOG:bananas
>> 
>> kilroyd AT MINIME ~
>> $ cat file.txt
>> LOG:bananas
>> 
>> kilroyd AT 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...

I thought this construction used a fifo under the hood.  That could
point to YA problem with my fifo implementation.

cgf

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