Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Core/System/IO/LogRetentionOption.cs

@@ -0,0 +1,38 @@
+// ==++==
+// 
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// 
+// ==--==
+/*============================================================
+**
+** Class:  LogStream
+**
+===========================================================*/
+using System;
+
+namespace System.IO {
+
+internal enum LogRetentionOption {
+
+    // One file with no maxFileSize
+    SingleFileUnboundedSize = 2,
+    
+    // One file with a maxFileSize 
+    SingleFileBoundedSize = 4,
+    
+    // Infinite number of sequential files, each with maxFileSize 
+    // When MaxFileSize is reached, writing starts in a new file with an incremented integer suffix.  
+    UnlimitedSequentialFiles = 0,
+    
+    // Finite number of sequential files, each with maxFileSize 
+    LimitedSequentialFiles = 3,
+    
+    // Finite number of circular sequential files, each with maxFileSize.  
+    // When MaxFileSize is reached, writing starts in a new file with an incremented integer suffix.  
+    // When MaxNumberOfFiles is reached first file is overwritten.  Files are then incrementally overwritten in a circular manner.
+    LimitedCircularFiles = 1
+}
+
+}
+
+