X-Recipient:	archive-cygwin AT delorie DOT com
X-SWARE-Spam-Status:	No, hits=-0.0 required=5.0 tests=AWL,BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,RCVD_IN_DNSWL_NONE
X-Spam-Check-By:	sourceware.org
From:	"Daniel Colascione" <dan DOT colascione AT gmail DOT com>
To:	<cygwin AT cygwin DOT com>
Subject:	{lp,cb}Reserved2 under Windows 7 and file descriptors
Date:	Wed, 14 Jul 2010 11:37:26 -0700
Message-ID:	<000801cb2383$9c3ad3a0$d4b07ae0$@gmail.com>
MIME-Version:	1.0
X-IsSubscribed:	yes
Mailing-List:	contact cygwin-help AT cygwin DOT com; run by ezmlm
List-Id:	<cygwin.cygwin.com>
List-Subscribe:	<mailto:cygwin-subscribe AT cygwin DOT com>
List-Archive:	<http://sourceware.org/ml/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-help AT cygwin DOT com>, <http://sourceware.org/ml/#faqs>
Sender:	cygwin-owner AT cygwin DOT com
Mail-Followup-To:	cygwin AT cygwin DOT com
Delivered-To:	mailing list cygwin AT cygwin DOT com

Windows 7 WOW64 seems to DTRT with respect to copying the process data;
needs_count_in_si_lpres2 can be false except on Vista. I'm testing a cygwin
with that modification now and it works fine (persistent Windows 7 sporadic
issues notwithstanding; those seem to be solved by rebaseall).

lpReserved2 working properly leads to another idea: set *lpReserved2 to a
non-zero value even when needs_count_in_si_lpres2 is a false; specifically,
set it to three and pass the stdin, stdout, and stderr handles and flags via
child_info. (child_info would have to begin with the appropriate values.) At
the worst, it does no harm; but if the child is using the MS C runtime,
it'll pick up the stdin file descriptors and flags from this data area. If
the flags are set properly, you should be able to get the C runtime to
report _isatty() is true for cygwin ptys. (Though of course GetFileType will
still reveal the thing to be a socket.)


--
Problem reports:       http://cygwin.com/problems.html
FAQ:                   http://cygwin.com/faq/
Documentation:         http://cygwin.com/docs.html
Unsubscribe info:      http://cygwin.com/ml/#unsubscribe-simple

- Raw text -