From 00785613030f83516dfe3073a17c58c4657cfe89 Mon Sep 17 00:00:00 2001
From: Paul Sokolovsky <pfalcon@users.sourceforge.net>
Date: Tue, 16 Dec 2014 00:28:02 +0200
Subject: [PATCH] modffi: Support void (None) return value for Python callback
 functions.

---
 unix/modffi.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/unix/modffi.c b/unix/modffi.c
index 21f3ca638..d6d416a3e 100644
--- a/unix/modffi.c
+++ b/unix/modffi.c
@@ -211,7 +211,9 @@ STATIC void call_py_func(ffi_cif *cif, void *ret, void** args, mp_obj_t func) {
     }
     mp_obj_t res = mp_call_function_n_kw(func, cif->nargs, 0, pyargs);
 
-    *(ffi_arg*)ret = mp_obj_int_get_truncated(res);
+    if (res != mp_const_none) {
+        *(ffi_arg*)ret = mp_obj_int_get_truncated(res);
+    }
 }
 
 STATIC mp_obj_t mod_ffi_callback(mp_obj_t rettype_in, mp_obj_t func_in, mp_obj_t paramtypes_in) {
-- 
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