=== modified file 'src/s/cygwin.h'
--- src/s/cygwin.h	2011-11-10 08:14:27 +0000
+++ src/s/cygwin.h	2012-01-02 18:20:53 +0000
@@ -58,7 +58,8 @@
       if (-1 == openpty (&fd, &dummy, pty_name, 0, 0))	\
 	fd = -1;					\
       sigsetmask (mask);				\
-      emacs_close (dummy);				\
+      if (fd >= 0)					\
+	emacs_close (dummy);				\
     }							\
   while (0)
 
@@ -81,10 +82,6 @@
 
 #define HAVE_SOCKETS
 
-/* vfork() interacts badly with setsid(), causing ptys to fail to
-   change their controlling terminal */
-#define vfork fork
-
 /* This should work (at least when compiling with gcc).  But I have no way
    or intention to verify or even test it.  If you encounter a problem with
    it, feel free to change this setting, but please add a comment here about