Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / SystemNet / Net / UnsafeMethods.cs / 1305376 / UnsafeMethods.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Net { using System; using System.Collections.Generic; using System.Text; using Microsoft.Win32.SafeHandles; using System.Security; using System.Runtime.InteropServices; using System.Runtime.ConstrainedExecution; using System.Threading; using System.Net.Sockets; [Flags] internal enum FormatMessageFlags : uint { FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x00000100, //FORMAT_MESSAGE_IGNORE_INSERTS = 0x00000200, //FORMAT_MESSAGE_FROM_STRING = 0x00000400, FORMAT_MESSAGE_FROM_HMODULE = 0x00000800, FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000, FORMAT_MESSAGE_ARGUMENT_ARRAY = 0x00002000 } [System.Security.SuppressUnmanagedCodeSecurityAttribute()] internal static class UnsafeSystemNativeMethods { private const string KERNEL32 = "KERNEL32.dll"; [System.Security.SecurityCritical] [DllImport(KERNEL32, ExactSpelling = true, CharSet = CharSet.Unicode, SetLastError = true)] internal static extern unsafe SafeLoadLibrary LoadLibraryExW( string lpwLibFileName, [In] void* hFile, uint dwFlags); [DllImport(KERNEL32, ExactSpelling = true, SetLastError = true)] [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)] [return: MarshalAs(UnmanagedType.Bool)] internal static extern unsafe bool FreeLibrary(IntPtr hModule); [System.Security.SecurityCritical] [DllImport(KERNEL32, EntryPoint = "GetProcAddress", SetLastError = true, BestFitMapping = false)] internal extern static IntPtr GetProcAddress(SafeLoadLibrary hModule, string entryPoint); [DllImport(KERNEL32, CharSet = CharSet.Unicode)] internal extern static uint FormatMessage( FormatMessageFlags dwFlags, IntPtr lpSource, UInt32 dwMessageId, UInt32 dwLanguageId, ref IntPtr lpBuffer, UInt32 nSize, IntPtr vaArguments ); [DllImport(KERNEL32, CharSet = CharSet.Unicode)] internal extern static uint LocalFree(IntPtr lpMem); } //// #pragma warning disable 618 // Have not migrated to v4 transparency yet [System.Security.SecurityCritical(System.Security.SecurityCriticalScope.Everything)] #pragma warning restore 618 [System.Security.SuppressUnmanagedCodeSecurityAttribute()] internal sealed class SafeLoadLibrary : SafeHandleZeroOrMinusOneIsInvalid { private const string KERNEL32 = "kernel32.dll"; private SafeLoadLibrary() : base(true) { } //private SafeLoadLibrary(bool ownsHandle) : base(ownsHandle) { } //internal static readonly SafeLoadLibrary Zero = new SafeLoadLibrary(false); internal unsafe static SafeLoadLibrary LoadLibraryEx(string library) { SafeLoadLibrary result = UnsafeSystemNativeMethods.LoadLibraryExW(library, null, 0); if (result.IsInvalid) { //NOTE: //IsInvalid tests the numeric value of the handle. //SetHandleAsInvalid sets the handle as closed, so that further closing //does not have to take place in the critical finalizer thread. // //You would think that when you assign 0 or -1 to an instance of //SafeHandleZeroOrMinusoneIsInvalid, the handle will not be closed, since after all it is invalid //It turns out that the SafeHandleZetoOrMinusOneIsInvalid overrides only the IsInvalid() method //It does not do anything to automatically close it. //So we have to SetHandleAsInvalid --> Which means mark it closed -- so that //we will not eventually call CloseHandle on 0 or -1 result.SetHandleAsInvalid(); } return result; } protected override bool ReleaseHandle() { return UnsafeSystemNativeMethods.FreeLibrary(handle); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.//
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