PipeStream returns 0 instead of blocking when running a command with…

src/Renci.SshNet/Common/PipeStream.cs

@@ -213,10 +213,22 @@ public override int Read(byte[] buffer, int offset, int count)
         /// <returns><c>True</c> if data available; otherwise<c>false</c>.</returns>
         private bool ReadAvailable(int count)
         {
+            if (Length == 0 && !IsEndOfStream())
+            {
+                return false;
+            }
+
             return (Length >= count || _isFlushed) &&
                    (Length >= (count + 1) || !BlockLastReadBuffer);
         }
 
+        public Func<bool> EndOfStream { private get; set; }
+
+        private bool IsEndOfStream()
+        {
+            return (EndOfStream == null) ? Length == 0 : EndOfStream();
+        }
+
         ///<summary>
         ///When overridden in a derived class, writes a sequence of bytes to the current stream and advances the current position within this stream by the number of bytes written.
         ///</summary>

src/Renci.SshNet/SshCommand.cs

@@ -246,7 +246,9 @@ public IAsyncResult BeginExecute(AsyncCallback callback, object state)
 
             //  Initialize output streams
             OutputStream = new PipeStream();
+            ((PipeStream)OutputStream).EndOfStream = () => { return _asyncResult.IsCompleted; };
             ExtendedOutputStream = new PipeStream();
+            ((PipeStream)ExtendedOutputStream).EndOfStream = () => { return _asyncResult.IsCompleted; };
 
             _result = null;
             _error = null;