From 9895091d0dfe5b05f86a7c78a8ee3f4a396a0121 Mon Sep 17 00:00:00 2001
From: Christopher Faylor <me@cgf.cx>
Date: Thu, 22 Jan 2009 16:00:58 +0000
Subject: [PATCH] * select.cc (peek_serial): Add hack to allow proper operation
 with com0com driver.

---
 winsup/cygwin/ChangeLog | 5 +++++
 winsup/cygwin/select.cc | 4 ++++
 2 files changed, 9 insertions(+)

diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog
index 11eefb75a..bdd910456 100644
--- a/winsup/cygwin/ChangeLog
+++ b/winsup/cygwin/ChangeLog
@@ -1,3 +1,8 @@
+2009-01-22  Christopher Faylor  <me+cygwin@cgf.cx>
+
+	* select.cc (peek_serial): Add hack to allow proper operation with
+	com0com driver.
+
 2009-01-21  Corinna Vinschen  <corinna@vinschen.de>
 
 	Remove USE_SERVER define.  Accommodate throughout.
diff --git a/winsup/cygwin/select.cc b/winsup/cygwin/select.cc
index eceeeafcb..da54da5a1 100644
--- a/winsup/cygwin/select.cc
+++ b/winsup/cygwin/select.cc
@@ -928,6 +928,10 @@ peek_serial (select_record *s, bool)
       goto out;
     }
 
+  /* This is apparently necessary for the com0com driver.
+     See: http://cygwin.com/ml/cygwin/2009-01/msg00667.html */
+  SetCommMask (h, 0);
+
   SetCommMask (h, EV_RXCHAR);
 
   if (!fh->overlapped_armed)