PIC for x86-64 *nix linking & a non-blocking poll in C API

.gitignore

@@ -1,2 +1,3 @@
 *build*
-*.pyc
+*.pyc
+.*.swp

CMakeLists.txt

@@ -1,7 +1,8 @@
-cmake_minimum_required (VERSION 2.6)
+cmake_minimum_required (VERSION 2.8.9)
 PROJECT(emokit)
 
 SET(BUILD_SHARED_LIBS false)
+SET_TARGET_PROPERTIES(emokit PROPERTIES POSITION_INDEPENDENT_CODE TRUE)
 
 LIST(APPEND CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake_modules)
 SET(EXECUTABLE_OUTPUT_PATH ${CMAKE_BINARY_DIR}/bin)

include/emokit/emokit.h

@@ -130,6 +130,15 @@ extern "C"
 	 * @return 0 if successful, < 0 for error
 	 */
 	EMOKIT_DECLSPEC int emokit_read_data(struct emokit_device* dev);
+
+	/**
+	 * Poll the device. Like emokit_read_data, but non-blocking.
+	 * 
+	 * @param dev Opened device structure
+	 * 
+	 * @return 0 if nothing read, >=1 if report was read, < 0 for error
+	 */
+	EMOKIT_DECLSPEC int emokit_poll_data(struct emokit_device* dev);
 
 	EMOKIT_DECLSPEC struct emokit_frame
 	emokit_get_next_frame(struct emokit_device* dev);

python/emokit/emotiv.py

@@ -359,9 +359,9 @@ def updateStdout(self):
                     os.system('cls')
                 else:
                     os.system('clear')
-                print "Packets Received: %s Packets Processed: %s" % (self.packetsReceived, self.packetsProcessed)
+                print("Packets Received: %s Packets Processed: %s" % (self.packetsReceived, self.packetsProcessed))
                 print('\n'.join("%s Reading: %s Strength: %s" % (k[1], self.sensors[k[1]]['value'],self.sensors[k[1]]['quality']) for k in enumerate(self.sensors)))
-                print "Battery: %i" % g_battery
+                print("Battery: %i" % g_battery)
             gevent.sleep(1)
 
     def getLinuxSetup(self):
@@ -388,7 +388,7 @@ def getLinuxSetup(self):
                     with open(input[0] + "/serial", 'r') as f:
                         serial = f.readline().strip()
                         f.close()
-                    print "Serial: " + serial + " Device: " + input[1]
+                    print("Serial: " + serial + " Device: " + input[1])
                     # Great we found it. But we need to use the second one...
                     hidraw = input[1]
                     id_hidraw = int(hidraw[-1])
@@ -398,7 +398,7 @@ def getLinuxSetup(self):
                     print "Serial: " + serial + " Device: " + hidraw + " (Active)"
                     return [serial, hidraw, ]
             except IOError as e:
-                print "Couldn't open file: %s" % e
+                print("Couldn't open file: %s" % e)
 
     def setupWin(self):
         devices = []
@@ -508,7 +508,7 @@ def setupCrypto(self, sn):
         key = ''.join(k)
         iv = Random.new().read(AES.block_size)
         cipher = AES.new(key, AES.MODE_ECB, iv)
-        for i in k: print "0x%.02x " % (ord(i))
+        for i in k: print("0x%.02x " % (ord(i)))
         while self._goOn:
             while not tasks.empty():
                 task = tasks.get()
@@ -522,8 +522,14 @@ def setupCrypto(self, sn):
     def dequeue(self):
         try:
             return self.packets.get()
-        except Exception, e:
-            print e
+        except Exception as e:
+            print(e)
+
+    def dequeue_nowait(self):
+        try:
+            return self.packets.get_nowait()
+        except Exception as e:
+            return None
 
     def close(self):
         if windows:

src/emokit.c

@@ -178,7 +178,20 @@ int emokit_close(struct emokit_device* s)
 
 int emokit_read_data(struct emokit_device* s)
 {
-	return hid_read(s->_dev, s->raw_frame, 32);
+	int res = hid_set_nonblocking(s->_dev, 0);
+	if(res < 0)
+		return res;
+	else
+		return hid_read(s->_dev, s->raw_frame, 32);
+}
+
+int emokit_poll_data(struct emokit_device* s)
+{
+	int res = hid_set_nonblocking(s->_dev, 1);
+	if(res < 0)
+		return res;
+	else
+		return hid_read(s->_dev, s->raw_frame, 32);
 }
 
 EMOKIT_DECLSPEC