isatty: Support for MSVC 9.

[gnulib.git] / lib / poll.c

diff --git a/lib/poll.c b/lib/poll.c
index d795eac..bd19eae 100644 (file)
--- a/lib/poll.c
+++ b/lib/poll.c
@@ -71,6 +71,8 @@
 
 #ifdef WIN32_NATIVE
 
+/* Optimized test whether a HANDLE refers to a console.
+   See <http://lists.gnu.org/archive/html/bug-gnulib/2009-08/msg00065.html>.  */
 #define IsConsoleHandle(h) (((long) (h) & 3) == 3)
 
 static BOOL