python-lxc: Call PyOS_AfterFork after attaching to a container

src/python-lxc/lxc.c

@@ -117,6 +117,12 @@ struct lxc_attach_python_payload {
 
 static int lxc_attach_python_exec(void* _payload)
 {
+    /* This function is the first one to be called after attaching to a
+     * container. As lxc_attach() calls fork() PyOS_AfterFork should be called
+     * in the new process if the Python interpreter will continue to be used.
+     */
+    PyOS_AfterFork();
+
     struct lxc_attach_python_payload *payload =
         (struct lxc_attach_python_payload *)_payload;
     PyObject *result = PyObject_CallFunctionObjArgs(payload->fn,