1 files changed, 30 insertions, 0 deletions
diff --git a/src/mscorlib/shared/System/IO/FileStream.Linux.cs b/src/mscorlib/shared/System/IO/FileStream.Linux.cs
new file mode 100644
index 0000000000..873c4eb559
--- /dev/null
+++ b/src/mscorlib/shared/System/IO/FileStream.Linux.cs
@@ -0,0 +1,30 @@
+// 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.Diagnostics;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace System.IO
+{
+    public partial class FileStream : Stream
+    {
+        /// <summary>Prevents other processes from reading from or writing to the FileStream.</summary>
+        /// <param name="position">The beginning of the range to lock.</param>
+        /// <param name="length">The range to be locked.</param>
+        private void LockInternal(long position, long length)
+        {
+            CheckFileCall(Interop.Sys.LockFileRegion(_fileHandle, position, length, Interop.Sys.LockType.F_WRLCK));
+        }
+
+        /// <summary>Allows access by other processes to all or part of a file that was previously locked.</summary>
+        /// <param name="position">The beginning of the range to unlock.</param>
+        /// <param name="length">The range to be unlocked.</param>
+        private void UnlockInternal(long position, long length)
+        {
+            CheckFileCall(Interop.Sys.LockFileRegion(_fileHandle, position, length, Interop.Sys.LockType.F_UNLCK));
+        }
+    }
+}