DirectoryFileSystem: use an opened file handle (if exists) when setting file dates to avoid ERROR_SHARING_VIOLATION

SMBServer/DirectoryFileSystem/StreamWatcher.cs

@@ -0,0 +1,113 @@
+/* Copyright (C) 2014-2017 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
+ * 
+ * You can redistribute this program and/or modify it under the terms of
+ * the GNU Lesser Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ */
+using System;
+using System.IO;
+
+namespace SMBServer
+{
+    /// <summary>
+    /// A wrapper for the stream class that notify when the stream is closed
+    /// </summary>
+    public class StreamWatcher : Stream
+    {
+        private Stream m_stream;
+
+        public event EventHandler Closed;
+
+        public StreamWatcher(Stream stream)
+        {
+            m_stream = stream;
+        }
+
+        public override int Read(byte[] buffer, int offset, int count)
+        {
+            return m_stream.Read(buffer, offset, count);
+        }
+
+        public override void Write(byte[] buffer, int offset, int count)
+        {
+            m_stream.Write(buffer, offset, count);
+        }
+
+        public override void Close()
+        {
+            m_stream.Close();
+            EventHandler handler = Closed;
+            if (handler != null)
+            {
+                handler(this, EventArgs.Empty);
+            }
+        }
+
+        public override void Flush()
+        {
+            m_stream.Flush();
+        }
+
+        public override long Seek(long offset, SeekOrigin origin)
+        {
+            return m_stream.Seek(offset, origin);
+        }
+
+        public override void SetLength(long value)
+        {
+            m_stream.SetLength(value);
+        }
+
+        public override bool CanSeek
+        {
+            get
+            {
+                return m_stream.CanSeek;
+            }
+        }
+
+        public override bool CanRead
+        {
+            get
+            {
+                return m_stream.CanRead;
+            }
+        }
+
+        public override bool CanWrite
+        {
+            get
+            {
+                return m_stream.CanWrite;
+            }
+        }
+
+        public override long Length
+        {
+            get
+            {
+                return m_stream.Length;
+            }
+        }
+
+        public override long Position
+        {
+            get
+            {
+                return m_stream.Position;
+            }
+            set
+            {
+                m_stream.Position = value;
+            }
+        }
+
+        public Stream Stream
+        {
+            get
+            {
+                return m_stream;
+            }
+        }
+    }
+}