struct sockaddr and sockaddr_in and in_addr

struct sockaddr
{
unsigned short sa_family; /* address family, AF_xxx */
char sa_data[14]; /* 14 bytes of protocol address */
};


struct sockaddr_in
{
short int sin_family; /* Address family */
unsigned short int sin_port; /* Port number */
struct in_addr sin_addr; /* Internet address */
unsigned char sin_zero[8]; /* Same size as struct sockaddr */
};

struct in_addr
{
in_addr_t s_addr;
};