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X-Authentication-Warning: ares.its.yale.edu: lsb32 owned process doing -bs
Date: Thu, 14 Apr 2005 08:04:59 -0400 (EDT)
From: Lev S Bishop <lev DOT bishop AT yale DOT edu>
To: cygwin AT cygwin DOT com
Subject: RE: Bash Process Substitution
Message-ID: <Pine.LNX.4.44.0504140718170.12305-100000@ares.its.yale.edu>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII

I tried building bash from the source package, and then it uses either
/dev/fd (if I have that as a symlink) or /proc/self/fd (if I don't),
rather than the fifo that the binary package uses. So perhaps whoever
built the binary package didn't have /proc/self/fd for whatever reason?

With my built bash.exe, process substitution seems to work for input:
$ echo <(ls)
/proc/self/fd/63
$ cat <(echo hi)
hi

But not for output:
$ tar -cf >(cat) syntax.c
tar: /proc/self/fd/63: Cannot open: Permission denied
tar: Error is not recoverable: exiting now

I'm not sure how there can be a permissions problem or what to do about 
it if there really is one, given that as I understand it 
the /proc/self/fd/63 is effectively a symlink to one end of something 
returned from pipe(2).

Lev



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