From bcd86815d667681dff8eba8cd376edf2c7f045a2 Mon Sep 17 00:00:00 2001
From: Ken Brown <kbrown@cornell.edu>
Date: Fri, 13 Apr 2012 10:50:25 -0400
Subject: [PATCH] * src/s/cygwin.h (PTY_OPEN): Don't try to close a bogus file
 descriptor.

---
 src/ChangeLog  | 4 ++++
 src/s/cygwin.h | 3 ++-
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/ChangeLog b/src/ChangeLog
index 63cb7a23da4..c23585bdab7 100644
--- a/src/ChangeLog
+++ b/src/ChangeLog
@@ -1,3 +1,7 @@
+2012-04-13  Ken Brown  <kbrown@cornell.edu>
+
+	* s/cygwin.h (PTY_OPEN): Don't try to close a bogus file descriptor.
+
 2012-04-13  Reuben Thomas  <rrt@sc3d.org>
 
 	* indent.c (Fmove_to_column): Change interactive spec (Bug#739).
diff --git a/src/s/cygwin.h b/src/s/cygwin.h
index 70d64a50c4e..f8c656e8ebc 100644
--- a/src/s/cygwin.h
+++ b/src/s/cygwin.h
@@ -58,7 +58,8 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
       if (-1 == openpty (&fd, &dummy, pty_name, 0, 0))	\
 	fd = -1;					\
       sigsetmask (mask);				\
-      emacs_close (dummy);				\
+      if (fd >= 0)					\
+	emacs_close (dummy);				\
     }							\
   while (0)
 
-- 
2.39.2