//-----------------------------------------------------------------------------
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.ServiceModel.Activation.Interop
{
    using System;
    using System.Runtime.ConstrainedExecution;
    using System.Runtime.InteropServices;
    using System.Runtime.Versioning;
    using System.Security;
    using Microsoft.Win32.SafeHandles;

    #pragma warning disable 618 // have not moved to the v4 security model yet
    [SecurityCritical(SecurityCriticalScope.Everything)]
    #pragma warning restore 618
    sealed class SafeCloseHandleCritical : SafeHandleZeroOrMinusOneIsInvalid
    {
        const string KERNEL32 = "kernel32.dll";

        SafeCloseHandleCritical()
            : base(true)
        {
        }

        protected override bool ReleaseHandle()
        {
            return CloseHandle(handle);
        }

        [DllImport(KERNEL32, ExactSpelling = true, SetLastError = true)]
        [SuppressUnmanagedCodeSecurity]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        [ResourceExposure(ResourceScope.None)]
        extern static bool CloseHandle(IntPtr handle);
    }
}