diff --git a/src/include/port.h b/src/include/port.h
index 54984fe437c17f4e91351b53f0547adb25f97e32..cd21976041a45f042153277b1e9dcb92b0583fe6 100644
--- a/src/include/port.h
+++ b/src/include/port.h
@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/port.h,v 1.69 2005/01/06 00:59:25 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/port.h,v 1.70 2005/02/27 00:53:29 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -174,7 +174,8 @@ extern bool rmtree(char *path, bool rmtopdir);
 
 #if defined(WIN32) && !defined(__CYGWIN__)
 
-/* open() replacement to allow delete of held files */
+/* open() replacement to allow delete of held files and passing
+ * of special options. */
 #ifndef WIN32_CLIENT_ONLY
 extern int	win32_open(const char *, int,...);
 
diff --git a/src/include/port/win32.h b/src/include/port/win32.h
index 9049fb4327f832d2c1478f8ce5f769bd33f0f47b..c3c7da737bca64d00f73b1ab3c5680837057a529 100644
--- a/src/include/port/win32.h
+++ b/src/include/port/win32.h
@@ -1,4 +1,4 @@
-/* $PostgreSQL: pgsql/src/include/port/win32.h,v 1.42 2004/12/26 19:20:33 tgl Exp $ */
+/* $PostgreSQL: pgsql/src/include/port/win32.h,v 1.43 2005/02/27 00:53:29 momjian Exp $ */
 
 /* undefine and redefine after #include */
 #undef mkdir
@@ -183,6 +183,14 @@ typedef int pid_t;
  */
 #define lstat(path, sb)	stat((path), (sb))
 
+/*
+ * Supplement to <fcntl.h>.
+ * This is the same value as _O_NOINHERIT in the MS header file. This is
+ * to ensure that we don't collide with a future definition. It means
+ * we cannot use _O_NOINHERIT ourselves.
+ */
+#define O_SYNC 0x0080
+
 /*
  * Supplement to <errno.h>.
  */
diff --git a/src/port/open.c b/src/port/open.c
index b61b66f493edde5a8125c9dc46735c25d84fcc1a..cd17f4164f470c436a094d39ff5652180ebd1747 100644
--- a/src/port/open.c
+++ b/src/port/open.c
@@ -6,13 +6,14 @@
  *
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/port/open.c,v 1.7 2004/12/31 22:03:53 pgsql Exp $
+ * $PostgreSQL: pgsql/src/port/open.c,v 1.8 2005/02/27 00:53:29 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
 
 #ifdef WIN32
 
+#include <postgres.h>
 #include <windows.h>
 #include <fcntl.h>
 #include <errno.h>
@@ -62,7 +63,7 @@ win32_open(const char *fileName, int fileFlags,...)
 	/* Check that we can handle the request */
 	assert((fileFlags & ((O_RDONLY | O_WRONLY | O_RDWR) | O_APPEND |
 						 (O_RANDOM | O_SEQUENTIAL | O_TEMPORARY) |
-						 _O_SHORT_LIVED |
+						 _O_SHORT_LIVED | O_SYNC |
 	  (O_CREAT | O_TRUNC | O_EXCL) | (O_TEXT | O_BINARY))) == fileFlags);
 
 	sa.nLength = sizeof(sa);
@@ -81,7 +82,8 @@ win32_open(const char *fileName, int fileFlags,...)
 				 ((fileFlags & O_RANDOM) ? FILE_FLAG_RANDOM_ACCESS : 0) |
 		   ((fileFlags & O_SEQUENTIAL) ? FILE_FLAG_SEQUENTIAL_SCAN : 0) |
 		  ((fileFlags & _O_SHORT_LIVED) ? FILE_ATTRIBUTE_TEMPORARY : 0) |
-			 ((fileFlags & O_TEMPORARY) ? FILE_FLAG_DELETE_ON_CLOSE : 0),
+			 ((fileFlags & O_TEMPORARY) ? FILE_FLAG_DELETE_ON_CLOSE : 0)|
+					((fileFlags & O_SYNC) ? FILE_FLAG_WRITE_THROUGH : 0),
 						NULL)) == INVALID_HANDLE_VALUE)
 	{
 		switch (GetLastError())