From c2b78400f257fc9602261a6ed344b7b6fedfcbac Mon Sep 17 00:00:00 2001
From: Julien Duponchelle <julien@duponchelle.info>
Date: Tue, 16 Feb 2016 17:26:53 +0100
Subject: [PATCH] Fix closing a docker console jump to 100% of CPU usage

Fix #427
---
 gns3server/utils/asyncio/telnet_server.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gns3server/utils/asyncio/telnet_server.py b/gns3server/utils/asyncio/telnet_server.py
index 839e69f5..1f7fabe2 100644
--- a/gns3server/utils/asyncio/telnet_server.py
+++ b/gns3server/utils/asyncio/telnet_server.py
@@ -127,6 +127,11 @@ class AsyncioTelnetServer:
                 data = coro.result()
                 if coro == network_read:
                     network_read = asyncio.async(network_reader.read(READ_SIZE))
+
+                    # Remote console is closed
+                    if len(data) == 0:
+                        raise ConnectionResetError()
+
                     if IAC in data:
                         data = yield from self._IAC_parser(data, network_reader, network_writer)
                     if self._writer: