From f46f8464853860461723a3ddb30299d51f8bf5cb Mon Sep 17 00:00:00 2001
From: Magnus Hagander <magnus@hagander.net>
Date: Tue, 13 May 2008 20:53:54 +0000
Subject: [PATCH] Don't try to close negative file descriptors, since this can
 cause crashes on certain platforms. In particular, the MSVC runtime is known
 to do this.

Fixes bug #4162, reported and diagnosed by Javier Pimas
---
 src/backend/access/transam/xlog.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 07681ebd75..c8fb1d5cce 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -2056,8 +2056,11 @@ got_record:;
 	return (XLogRecord *) buffer;
 
 next_record_is_invalid:;
-	close(readFile);
-	readFile = -1;
+	if (readFile >= 0)
+	{
+		close(readFile);
+		readFile = -1;
+	}
 	nextRecord = NULL;
 	return NULL;
 }
-- 
2.39.5