Try as much as possible to read process status

pupy/packages/linux/all/ptyshell.py

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 # Copyright (c) 2015, Nicolas VERDIER (contact@n1nj4.eu)
 # Pupy is under the BSD 3-Clause license. see the LICENSE file at the root of the project for the detailed licence terms
+
 import sys
 import os
 import os.path
@@ -25,8 +26,19 @@ class PtyShell(object):
         self.real_stdout = sys.stdout
 
     def close(self):
-        if self.prog is not None and self.prog.returncode is None:
-            self.prog.terminate()
+        if self.prog is not None:
+            self.prog.poll()
+
+            if self.prog.returncode is None:
+                try:
+                    self.prog.terminate()
+                except:
+                    pass
+
+                try:
+                    self.prog.poll()
+                except:
+                    pass
 
     def __del__(self):
         self.close()