mono/netcore/System.Private.CoreLib/shared/System/IO/FileOptions.cs

// 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.

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.
    [Flags]
    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
    }
}