From: Magnus Hagander <magnus@hagander.net>
Date: Mon, 4 May 2009 08:36:44 +0000 (+0000)
Subject: Call SetLastError(0) before calling the file mapping functions
X-Git-Tag: REL8_3_8~53
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f1555e690132a97ac52f1c07a2f943e59d98fd6;p=thirdparty%2Fpostgresql.git

Call SetLastError(0) before calling the file mapping functions
to make sure that the error code is reset, as a precaution in
case the API doesn't properly reset it on success. This could
be necessary, since we check the error value even if the function
doesn't fail for specific success cases.
---

diff --git a/src/backend/port/win32_shmem.c b/src/backend/port/win32_shmem.c
index 394eb976f04..8c61a9aa85e 100644
--- a/src/backend/port/win32_shmem.c
+++ b/src/backend/port/win32_shmem.c
@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/port/win32_shmem.c,v 1.4.2.2 2008/10/30 17:04:11 mha Exp $
+ *	  $PostgreSQL: pgsql/src/backend/port/win32_shmem.c,v 1.4.2.3 2009/05/04 08:36:44 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -131,6 +131,9 @@ PGSharedMemoryCreate(Size size, bool makePrivate, int port)
 
 	UsedShmemSegAddr = NULL;
 
+	/* In case CreateFileMapping() doesn't set the error code to 0 on success */
+	SetLastError(0);
+
 	hmap = CreateFileMapping((HANDLE) 0xFFFFFFFF,		/* Use the pagefile */
 							 NULL,		/* Default security attrs */
 							 PAGE_READWRITE,	/* Memory is Read/Write */
@@ -160,6 +163,9 @@ PGSharedMemoryCreate(Size size, bool makePrivate, int port)
 
 		Sleep(1000);
 
+		/* In case CreateFileMapping() doesn't set the error code to 0 on success */
+		SetLastError(0);
+
 		hmap = CreateFileMapping((HANDLE) 0xFFFFFFFF, NULL, PAGE_READWRITE, 0L, (DWORD) size, szShareMem);
 		if (!hmap)
 			ereport(FATAL,