struct in_addr if_addr,
unsigned int mcast_addr,
ifindex_t ifindex);
-extern int setsockopt_ipv4_multicast_loop(int sock, u_char val);
+extern int setsockopt_ipv4_multicast_loop(int sock, uint8_t val);
extern int setsockopt_ipv4_tos(int sock, int tos);