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Date: Sun, 12 Sep 2010 14:39:03 -0700
From: Daniel Colascione <dan DOT colascione AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: {lp,cb}Reserved2 under Windows 7 and file descriptors
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On 9/12/10 2:29 PM, Andy Koppe wrote:
> This does appear to work! Proof-of-concept code attached, along with a
> couple of tests. Running in mintty:

Awesome. Thanks for doing this work. I believe the Cygwin developers had
concerns about this change inadvertently breaking some applications.
Have you noticed any unusual behavior?

> Unfortunately it only seems to work for fdev's direct child process
> though. For example, when running cmd.exe through fdev and invoking
> isatty.exe from there, it's all zeroes from isatty() again.

Unfortunately, cmd.exe does not appear to use the C runtime IO library,
and it doesn't pass on inherited file descriptors --- except for the
standard handles via CreateProcess. It's a shame, too, because cmd
understands the syntax for manipulating the first ten file descriptors
in much the same way that a unix shell does.

I think it would work for other families of process though, and it's
still an improvement.


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