// ==++==
// 
//   Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// ==--==
/*============================================================
**
** Class:  SafeEventLogWriteHandle 
**
** <EMAIL>Author: David Gutierrez (Microsoft) </EMAIL>
**
** A wrapper for event log handles
**
** Date:  July 8, 2002
** 
===========================================================*/

using System;
using System.Security;
using System.Security.Permissions;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using Microsoft.Win32;
using Microsoft.Win32.SafeHandles;
using System.Runtime.ConstrainedExecution;
using System.Runtime.Versioning;

namespace Microsoft.Win32.SafeHandles {
    [HostProtectionAttribute(MayLeakOnAbort = true)]
    [SuppressUnmanagedCodeSecurityAttribute]
    internal sealed class SafeEventLogWriteHandle : SafeHandleZeroOrMinusOneIsInvalid
    {
        // Note: RegisterEventSource returns 0 on failure

        internal SafeEventLogWriteHandle () : base(true) {}

        [DllImport(ExternDll.Advapi32, CharSet=System.Runtime.InteropServices.CharSet.Unicode, SetLastError=true)]
        [ResourceExposure(ResourceScope.Machine)]
        internal static extern SafeEventLogWriteHandle RegisterEventSource(string uncServerName, string sourceName);

        [DllImport(ExternDll.Advapi32, SetLastError=true)]
        [ResourceExposure(ResourceScope.None)]
        [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
        private static extern bool DeregisterEventSource(IntPtr hEventLog);

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