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

diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 8ce08bcdec3ecf1425d69e9c58f486ba9c1cbb86..6ba56a58ca3738c3e4815c64251ae3faac205404 100644 (file)
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.222.2.6 2007/09/29 01:36:29 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.222.2.7 2008/05/13 20:53:58 mha Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2934,8 +2934,11 @@ got_record:;
        return (XLogRecord *) buffer;
 
 next_record_is_invalid:;
-       close(readFile);
-       readFile = -1;
+       if (readFile >= 0)
+       {
+               close(readFile);
+               readFile = -1;
+       }
        nextRecord = NULL;
        return NULL;
 }