1 // Licensed to the .NET Foundation under one or more agreements.
2 // The .NET Foundation licenses this file to you under the MIT license.
3 // See the LICENSE file in the project root for more information.
4 
5 using Microsoft.Win32.SafeHandles;
6 using System;
7 using System.Runtime.InteropServices;
8 
9 internal partial class Interop
10 {
11     internal partial class Kernel32
12     {
13         // Note there are two different WriteFile prototypes - this is to use
14         // the type system to force you to not trip across a "feature" in
15         // Win32's async IO support.  You can't do the following three things
16         // simultaneously: overlapped IO, free the memory for the overlapped
17         // struct in a callback (or an EndWrite method called by that callback),
18         // and pass in an address for the numBytesRead parameter.
19 
20         [DllImport(Libraries.Kernel32, SetLastError = true)]
WriteFile(SafeHandle handle, byte* bytes, int numBytesToWrite, out int numBytesWritten, IntPtr mustBeZero)21         internal static extern unsafe int WriteFile(SafeHandle handle, byte* bytes, int numBytesToWrite, out int numBytesWritten, IntPtr mustBeZero);
22     }
23 }
24