Imported Upstream version 6.12.0.140

Former-commit-id: ed640e59d63de60be89ee9bbe5a6b63afcf639f5

mcs/class/corlib/corefx/Interop.ReadDir.Mono.cs

@@ -0,0 +1,45 @@
+// 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 System;
+using System.Runtime.InteropServices;
+
+internal static partial class Interop
+{
+	internal static partial class Sys
+	{
+		[DllImport(Libraries.SystemNative, EntryPoint = "SystemNative_OpenDir", SetLastError = true)]
+		internal static extern IntPtr OpenDir_native(string path);
+
+		[DllImport(Libraries.SystemNative, EntryPoint = "SystemNative_ReadDirR", SetLastError = false)]
+		internal static extern unsafe int ReadDirR_native(IntPtr dir, byte* buffer, int bufferSize, out DirectoryEntry outputEntry);
+
+		[DllImport(Libraries.SystemNative, EntryPoint = "SystemNative_CloseDir", SetLastError = true)]
+		internal static extern int CloseDir_native(IntPtr dir);
+
+		internal static IntPtr OpenDir (string path) {
+			IntPtr result;
+			do {
+				result = OpenDir_native (path);
+			} while (result == IntPtr.Zero && Marshal.GetLastWin32Error () == (int) Interop.Error.EINTR);
+			return result;
+		}
+
+		internal static int CloseDir (IntPtr dir) {
+			int result;
+			do {
+				result = CloseDir_native (dir);
+			} while (result < 0 && Marshal.GetLastWin32Error () == (int) Interop.Error.EINTR);
+			return result;
+		}
+
+		internal static unsafe int ReadDirR (IntPtr dir, byte* buffer, int bufferSize, out DirectoryEntry outputEntry) {
+			int result;
+			do {
+				result = ReadDirR_native (dir, buffer, bufferSize, out outputEntry);
+			} while (result == (int) Interop.Error.EINTR);
+			return result;
+		}
+	}
+}