1 files changed, 46 insertions, 0 deletions
diff --git a/src/System.Private.CoreLib/shared/Interop/Windows/NtDll/NtQueryInformationFile.cs b/src/System.Private.CoreLib/shared/Interop/Windows/NtDll/NtQueryInformationFile.cs
new file mode 100644
index 000000000..4ba39a74e
--- /dev/null
+++ b/src/System.Private.CoreLib/shared/Interop/Windows/NtDll/NtQueryInformationFile.cs
@@ -0,0 +1,46 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using Microsoft.Win32.SafeHandles;
+using System;
+using System.Runtime.InteropServices;
+
+internal partial class Interop
+{
+    internal partial class NtDll
+    {
+        [DllImport(Libraries.NtDll, ExactSpelling = true)]
+        unsafe internal static extern int NtQueryInformationFile(
+            SafeFileHandle FileHandle,
+            out IO_STATUS_BLOCK IoStatusBlock,
+            void* FileInformation,
+            uint Length,
+            uint FileInformationClass);
+
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct IO_STATUS_BLOCK
+        {
+            IO_STATUS Status;
+            IntPtr Information;
+        }
+
+        // This isn't an actual Windows type, we have to separate it out as the size of IntPtr varies by architecture
+        // and we can't specify the size at compile time to offset the Information pointer in the status block.
+        [StructLayout(LayoutKind.Explicit)]
+        internal struct IO_STATUS
+        {
+            [FieldOffset(0)]
+            int Status;
+
+            [FieldOffset(0)]
+            IntPtr Pointer;
+        }
+
+        internal const uint FileModeInformation = 16;
+        internal const uint FILE_SYNCHRONOUS_IO_ALERT = 0x00000010;
+        internal const uint FILE_SYNCHRONOUS_IO_NONALERT = 0x00000020;
+
+        internal const int STATUS_INVALID_HANDLE = unchecked((int)0xC0000008);
+    }
+}