On Thu, Aug 20, 2009 at 02:11:06PM +0100, Dave Korn wrote:
>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
Is there something wrong with Cygwin's code for determining if a handle is a
console?
...
if (GetConsoleScreenBufferInfo (handle, &buf))
{
...
}
else if (GetNumberOfConsoleInputEvents (handle, (DWORD *) &buf))
{
...
}
It's been working pretty well for centuries.
cgf
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