5#define INADDR_ANY 0x00000000
6#define INADDR_LOOPBACK 0x7F000001
7#define INADDR_BROADCAST 0xFFFFFFFF
8#define INADDR_NONE 0xFFFFFFFF
10#define INET_ADDRSTRLEN 16
18#define IP_MULTICAST_IF 9
19#define IP_MULTICAST_TTL 10
20#define IP_MULTICAST_LOOP 11
21#define IP_ADD_MEMBERSHIP 12
22#define IP_DROP_MEMBERSHIP 13
struct in_addr imr_interface
struct in_addr imr_multiaddr
unsigned char sin_zero[8]