54 lines
1.8 KiB
C#
54 lines
1.8 KiB
C#
// ==++==
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// ==--==
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/*============================================================
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**
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** Class: SafeFileMapViewHandle
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**
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** <EMAIL>Author: Brian Grunkemeyer (Microsoft) </EMAIL>
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**
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** A wrapper for handles returned from MapViewOfFile, used
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** for shared memory.
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**
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** Date: August 7, 2002
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**
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===========================================================*/
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using System;
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using System.Security;
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using System.Security.Permissions;
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using System.Runtime.InteropServices;
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using System.Runtime.CompilerServices;
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using Microsoft.Win32;
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using Microsoft.Win32.SafeHandles;
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using System.Runtime.ConstrainedExecution;
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using System.Runtime.Versioning;
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namespace Microsoft.Win32.SafeHandles {
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[HostProtectionAttribute(MayLeakOnAbort = true)]
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[SuppressUnmanagedCodeSecurityAttribute]
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internal sealed class SafeFileMapViewHandle : SafeHandleZeroOrMinusOneIsInvalid
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{
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// Note that MapViewOfFile returns 0 on failure
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internal SafeFileMapViewHandle() : base(true) {}
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[DllImport(ExternDll.Kernel32, ExactSpelling=true, CharSet=CharSet.Auto)]
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[ResourceExposure(ResourceScope.Machine)]
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internal static extern SafeFileMapViewHandle MapViewOfFile(SafeFileMappingHandle hFileMappingObject, int dwDesiredAccess, int dwFileOffsetHigh, int dwFileOffsetLow, UIntPtr dwNumberOfBytesToMap);
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[DllImport(ExternDll.Kernel32, ExactSpelling=true, SetLastError=true)]
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[ResourceExposure(ResourceScope.None)]
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[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
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private static extern bool UnmapViewOfFile(IntPtr handle);
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override protected bool ReleaseHandle()
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{
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return UnmapViewOfFile(handle);
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}
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}
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}
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