return None on EAGAIN in read_one() instead of raising an IOError

gvalkov · gvalkov · commit 6737ab6bb971 · 2014-06-04T20:53:42.000+02:00
diff --git a/doc/changelog.rst b/doc/changelog.rst
@@ -1,6 +1,14 @@
 Changelog
 =========
 
+0.4.4 (Jun 04, 2014)
+^^^^^^^^^^^^^^^^^^^^
+
+Fixes:
+    - Calling ``InputDevice.read_one()`` should always return
+      ``None``, when there is nothing to be read, even in case of a
+      ``EAGAIN`` errno (thanks JPP).
+
 0.4.3 (Dec 19, 2013)
 ^^^^^^^^^^^^^^^^^^^^
 
diff --git a/evdev/input.c b/evdev/input.c
@@ -47,6 +47,11 @@ device_read(PyObject *self, PyObject *args)
     int n = read(fd, &event, sizeof(event));
 
     if (n < 0) {
+        if (errno == EAGAIN) {
+            Py_INCREF(Py_None);
+            return Py_None;
+        }
+
         PyErr_SetFromErrno(PyExc_IOError);
         return NULL;
     }
