Untested fix re #789

1 files changed, 9 insertions, 0 deletions

diff --git a/paramiko/proxy.py b/paramiko/proxy.py
index d3ae436f..5f7f0023 100644
--- a/paramiko/proxy.py
+++ b/paramiko/proxy.py
@@ -107,5 +107,14 @@ class ProxyCommand(ClosingContextManager):
     def close(self):
         os.kill(self.process.pid, signal.SIGTERM)
 
+    @property
+    def closed(self):
+        return self.process.returncode is not None
+
+    @property
+    def _closed(self):
+        # Concession to Python 3 socket-like API
+        return self.closed
+
     def settimeout(self, timeout):
         self.timeout = timeout