1 files changed, 47 insertions, 0 deletions
diff --git a/src/mscorlib/src/System/IO/FileOptions.cs b/src/mscorlib/src/System/IO/FileOptions.cs
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+++ b/src/mscorlib/src/System/IO/FileOptions.cs
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+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+/*============================================================
+**
+** Enum:   FileOptions
+** 
+** 
+**
+**
+** Purpose: Additional options to how to create a FileStream.
+**    Exposes the more obscure CreateFile functionality.
+**
+**
+===========================================================*/
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace System.IO {
+    // Maps to FILE_FLAG_DELETE_ON_CLOSE and similar values from winbase.h.
+    // We didn't expose a number of these values because we didn't believe 
+    // a number of them made sense in managed code, at least not yet.
+    [Serializable]
+    [Flags]
+    [ComVisible(true)]
+    public enum FileOptions
+    {
+        // NOTE: any change to FileOptions enum needs to be 
+        // matched in the FileStream ctor for error validation
+        None = 0,
+        WriteThrough = unchecked((int)0x80000000),
+        Asynchronous = unchecked((int)0x40000000), // FILE_FLAG_OVERLAPPED
+        // NoBuffering = 0x20000000,
+        RandomAccess = 0x10000000,
+        DeleteOnClose = 0x04000000,
+        SequentialScan = 0x08000000,
+        // AllowPosix = 0x01000000,  // FILE_FLAG_POSIX_SEMANTICS
+        // BackupOrRestore,
+        // DisallowReparsePoint = 0x00200000, // FILE_FLAG_OPEN_REPARSE_POINT
+        // NoRemoteRecall = 0x00100000, // FILE_FLAG_OPEN_NO_RECALL
+        // FirstPipeInstance = 0x00080000, // FILE_FLAG_FIRST_PIPE_INSTANCE
+        Encrypted = 0x00004000, // FILE_ATTRIBUTE_ENCRYPTED
+    }
+}
+