More robust process killing

nilmrun/processmanager.py

@@ -92,6 +92,12 @@ class Process(object):
                 except OSError: # pragma: no cover
                     return None
 
+            def kill(pid, sig):
+                try:
+                    return os.kill(pid, sig)
+                except OSError: # pragma: no cover
+                    return
+
             # Find all children
             group = getpgid(self._process.pid)
             main = psutil.Process(self._process.pid)
@@ -100,7 +106,7 @@ class Process(object):
             # Kill with SIGTERM, if they're still in this process group
             for proc in allproc:
                 if getpgid(proc.pid) == group:
-                    os.kill(proc.pid, signal.SIGTERM)
+                    kill(proc.pid, signal.SIGTERM)
 
             # Wait for it to die again
             if self._join(timeout):
@@ -109,7 +115,7 @@ class Process(object):
             # One more try with SIGKILL
             for proc in allproc:
                 if getpgid(proc.pid) == group:
-                    os.kill(proc.pid, signal.SIGKILL)
+                    kill(proc.pid, signal.SIGKILL)
 
             # See if it worked
             return self._join(timeout)