From a815b56d84e1876c5f6e5fc9f4b3bc46a1a3cfb3 Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 22 May 2013 06:19:03 +0000
Subject: win32.c: check error of SetFilePointer

* win32/win32.c (setup_overlapped): check the error code in addition
  to the result of SetFilePointer() to determine if an error occurred,
  because INVALID_SET_FILE_POINTER is a valid value.
  [ruby-core:55098] [Bug #8431]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@40888 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 win32/win32.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'win32')

diff --git a/win32/win32.c b/win32/win32.c
index 74d13960bc..b7eb4c62f2 100644
--- a/win32/win32.c
+++ b/win32/win32.c
@@ -6028,8 +6028,11 @@ setup_overlapped(OVERLAPPED *ol, int fd)
 #define INVALID_SET_FILE_POINTER ((DWORD)-1)
 #endif
 	if (low == INVALID_SET_FILE_POINTER) {
-	    errno = map_errno(GetLastError());
-	    return -1;
+	    DWORD err = GetLastError();
+	    if (err != NO_ERROR) {
+		errno = map_errno(err);
+		return -1;
+	    }
 	}
 	ol->Offset = low;
 	ol->OffsetHigh = high;
-- 
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