ethtool: Make get_dev_int_value generic

Will be used for ETHTOOL_GCOALESCE and others that retrieve a struct.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

Author: acmel

python-ethtool/ethtool.c

@@ -405,7 +405,7 @@ static PyObject *get_businfo(PyObject *self __unused, PyObject *args)
 	return PyString_FromString(((struct ethtool_drvinfo *)buf)->bus_info);
 }
 
-static int get_dev_int_value(int cmd, PyObject *args, int *value)
+static int get_dev_value(int cmd, PyObject *args, void *value, size_t len)
 {
 	struct ethtool_value eval;
 	struct ifreq ifr;
@@ -438,11 +438,16 @@ static int get_dev_int_value(int cmd, PyObject *args, int *value)
 	}
 
 	close(fd);
-	*value = eval.data;
+	memcpy(value, eval.data, len);
 
 	return err;
 }
 
+static int get_dev_int_value(int cmd, PyObject *args, int *value)
+{
+	return get_dev_value(cmd, args, value, sizeof(*value));
+}
+
 static PyObject *get_tso(PyObject *self __unused, PyObject *args)
 {
 	int value;