diff --git a/addrs_ioctl.h b/addrs_ioctl.h
new file mode 100644
index 0000000..f93a0b4
--- /dev/null
+++ b/addrs_ioctl.h
@@ -0,0 +1,12 @@
+/*
+ * iftop.h:
+ *
+ */
+
+#ifndef __ADDRS_IOCTL_H_ /* include guard */
+#define __ADDRS_IOCTL_H_
+
+int
+get_addrs_ioctl(char *interface, char if_hw_addr[], struct in_addr *if_ip_addr, struct in6_addr *if_ip6_addr);
+
+#endif /* __ADDRS_IOCTL_H_ */