Message-ID: <4A8D4A89.9020904@byu.net>
Date: Thu, 20 Aug 2009 07:07:21 -0600
From: Eric Blake <ebb9@byu.net>
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Subject: Re: [ANNOUNCEMENT] Updated: run-1.1.11-1
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According to Dave Korn on 8/20/2009 7:11 AM:
> 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.

Agreed - Bruno raised this concern, but Paolo committed the change anyway,
so I've asked them to clarify.

At any rate, Bruno also had this suggestion in that thread:

static BOOL
IsHandleConsole(HANDLE h)
{
  DWORD mode;
  return GetConsoleMode (h, &mode);
}

- --
Don't work too hard, make some time for fun as well!

Eric Blake             ebb9@byu.net
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