SafeMemoryMappedFileHandle.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Win32 / SafeHandles / SafeMemoryMappedFileHandle.cs / 1305376 / SafeMemoryMappedFileHandle.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  SafeMemoryMappedFileHandle 
**
** Purpose: Safe handle wrapping a file mapping object handle 
**
** Date:  Febuary 7, 2007
**
===========================================================*/ 

using System; 
using System.Runtime.Versioning; 
using System.Security.Permissions;
using Microsoft.Win32; 
using Microsoft.Win32.SafeHandles;

namespace Microsoft.Win32.SafeHandles {
 
    // Reliability notes:
    // ReleaseHandle has reliability guarantee of Cer.Success, as defined by SafeHandle. 
    // It gets prepared as a CER at instance construction time. This safe handle doesn't 
    // need to override IsInvalid because the one it inherits from
    // SafeHandleZeroOrMinusOneIsInvalid is correct. 

    // 
    // 
    //  
#pragma warning disable 618    // Have not migrated to v4 transparency yet
    [System.Security.SecurityCritical(System.Security.SecurityCriticalScope.Everything)] 
#pragma warning restore 618 
    public sealed class SafeMemoryMappedFileHandle : SafeHandleZeroOrMinusOneIsInvalid {
 
        [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)]
        internal SafeMemoryMappedFileHandle() : base(true) { }

        [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode = true)] 
        internal SafeMemoryMappedFileHandle(IntPtr handle, bool ownsHandle) : base(ownsHandle) {
            SetHandle(handle); 
        } 

        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        override protected bool ReleaseHandle() {
            return UnsafeNativeMethods.CloseHandle(handle);
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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