Imported Upstream version 4.0.1

Former-commit-id: 757121caeaad523350be5330f0a3ecc891c70fb8

external/referencesource/SMDiagnostics/System/ServiceModel/Diagnostics/SafeEventLogWriteHandle.cs

@@ -0,0 +1,53 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.ServiceModel.Diagnostics
+{
+    using Microsoft.Win32.SafeHandles;
+    using System.Runtime.InteropServices;
+    using System.Runtime.Versioning;
+    using System.Globalization;
+    using System.Diagnostics;
+    using System.Security;
+    using System.Runtime;
+
+    [Fx.Tag.SecurityNote(Critical = "Usage of SafeHandleZeroOrMinusOneIsInvalid, which is protected by a LinkDemand and InheritanceDemand")]
+    [SecurityCritical]
+    sealed class SafeEventLogWriteHandle : SafeHandleZeroOrMinusOneIsInvalid
+    {
+        // Note: RegisterEventSource returns 0 on failure
+        [Fx.Tag.SecurityNote(Critical = "Usage of SafeHandleZeroOrMinusOneIsInvalid, which is protected by a LinkDemand and InheritanceDemand")]
+        [SecurityCritical]
+        SafeEventLogWriteHandle() : base(true) { }
+
+        [ResourceConsumption(ResourceScope.Machine)]
+        [Fx.Tag.SecurityNote(Critical = "Usage of SafeHandleZeroOrMinusOneIsInvalid, which is protected by a LinkDemand and InheritanceDemand")]
+        [SecurityCritical]
+        internal static SafeEventLogWriteHandle RegisterEventSource(string uncServerName, string sourceName)
+        {
+            SafeEventLogWriteHandle retval = NativeMethods.RegisterEventSource(uncServerName, sourceName);
+            int error = Marshal.GetLastWin32Error();
+            if (retval.IsInvalid)
+            {
+                Debug.Print("SafeEventLogWriteHandle::RegisterEventSource[" + uncServerName + ", " + sourceName + "] Failed. Last Error: " +
+                    error.ToString(CultureInfo.InvariantCulture));
+            }
+            return retval;
+        }
+
+        [DllImport("advapi32", SetLastError = true)]
+        [ResourceExposure(ResourceScope.None)]
+        private static extern bool DeregisterEventSource(IntPtr hEventLog);
+
+#pragma warning disable 56523
+        [Fx.Tag.SecurityNote(Critical = "Usage of SafeHandleZeroOrMinusOneIsInvalid, which is protected by a LinkDemand and InheritanceDemand")]
+        [SecurityCritical]
+        override protected bool ReleaseHandle()
+        {
+            return DeregisterEventSource(this.handle);
+        }
+#pragma warning restore 56523
+
+    }
+}