mcs/class/referencesource/System/compmod/microsoft/win32/safehandles/SafeLocalMemHandle.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 /*============================================================
   7 **
   8 ** Class:  SafeLocalMemHandle
   9 **
  10 ** <EMAIL>Author: David Gutierrez (Microsoft) </EMAIL>
  11 **
  12 ** A wrapper for handle to local memory
  13 **
  14 ** Date:  July 8, 2002
  15 **
  16 ===========================================================*/
  17
  18 using System;
  19 using System.Security;
  20 using System.Security.Permissions;
  21 using System.Runtime.InteropServices;
  22 using System.Runtime.CompilerServices;
  23 using Microsoft.Win32;
  24 using Microsoft.Win32.SafeHandles;
  25 using System.Runtime.ConstrainedExecution;
  26 using System.Runtime.Versioning;
  27
  28 namespace Microsoft.Win32.SafeHandles {
  29     [HostProtectionAttribute(MayLeakOnAbort = true)]
  30     [SuppressUnmanagedCodeSecurityAttribute]
  31     internal sealed class SafeLocalMemHandle : SafeHandleZeroOrMinusOneIsInvalid
  32     {
  33         internal SafeLocalMemHandle() : base(true) {}
  34
  35         [SecurityPermission(SecurityAction.LinkDemand, UnmanagedCode=true)]
  36         internal SafeLocalMemHandle(IntPtr existingHandle, bool ownsHandle) : base(ownsHandle) {
  37             SetHandle(existingHandle);
  38         }
  39
  40
  41         [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Auto, SetLastError=true, BestFitMapping=false)]
  42         [ResourceExposure(ResourceScope.None)]
  43         internal static extern unsafe bool ConvertStringSecurityDescriptorToSecurityDescriptor(string StringSecurityDescriptor, int StringSDRevision, out SafeLocalMemHandle pSecurityDescriptor, IntPtr SecurityDescriptorSize);
  44
  45         [DllImport(ExternDll.Kernel32)]
  46         [ResourceExposure(ResourceScope.None)]
  47         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
  48         private static extern IntPtr LocalFree(IntPtr hMem);
  49
  50         override protected bool ReleaseHandle()
  51         {
  52             return LocalFree(handle) == IntPtr.Zero;
  53         }
  54
  55     }
  56 }
  57
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