X-Recipient: archive-cygwin@delorie.com X-SWARE-Spam-Status: No, hits=-2.5 required=5.0 tests=AWL,BAYES_00,SPF_PASS X-Spam-Check-By: sourceware.org Message-ID: <4A8D4B6A.9080706@gmail.com> Date: Thu, 20 Aug 2009 14:11:06 +0100 From: Dave Korn User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: cygwin@cygwin.com Subject: Re: [ANNOUNCEMENT] Updated: run-1.1.11-1 References: <200908171705.n7HH5TYe024203@StraightRunning.com> <4A89A490.1050108@cwilson.fastmail.fm> <4A8D429A.1070306@byu.net> In-Reply-To: <4A8D429A.1070306@byu.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Delivered-To: mailing list cygwin@cygwin.com Eric Blake wrote: > See this thread on the gnulib list, which claims that you can use this > undocumented snippet to decide whether a HANDLE is a console: > >> #define IsHandleConsole(h) (((long) (h) & 3) == 3) > > http://lists.gnu.org/archive/html/bug-gnulib/2009-08/msg00065.html I wouldn't rely on that for a microsecond. The low two bits of a HANDLE are pretty free form and could easily be used for other purposes by other types of object. Read the rest of the thread; it's a convention used internally by WINE. MS doesn't necessarily follow suit. See also Chen on handles: http://blogs.msdn.com/oldnewthing/archive/2005/01/21/358109.aspx cheers, DaveK -- 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