use the same error messages in socketcan_ctypes' send() as in socketcan_native's send()

Author: felixdivo

can/interfaces/socketcan/socketcan_ctypes.py

@@ -125,12 +125,16 @@ def recv(self, timeout=None):
 
     def send(self, msg, timeout=None):
         frame = _build_can_frame(msg)
+
         if timeout:
             # Wait for write availability. write will fail below on timeout
-            select.select([], [self.socket], [], timeout)
+            _, ready_send_sockets, _ = select.select([], [self.socket], [], timeout)
+            if not ready_send_sockets:
+                raise can.CanError("Timeout while sending")
+
         bytes_sent = libc.write(self.socket, ctypes.byref(frame), ctypes.sizeof(frame))
+
         if bytes_sent == -1:
-            log.debug("Error sending frame :-/")
             raise can.CanError("can.socketcan.ctypes failed to transmit")
         elif bytes_sent == 0:
             raise can.CanError("Transmit buffer overflow")