Socket Address Structure

IPv4與IPv6的Socket Address Structure定義於"netinet/in.h"裡。

IPv4 Socket address structure: sockaddr_in

/* Internet address. */
typedef uint32_t in_addr_t;
struct in_addr {
in_addr_t s_addr;
};

/* Structure describing an Internet socket address. */
struct sockaddr_in {
sa_family_t sin_family; /* AF_INET */
in_port_t sin_port;
struct in_addr sin_addr;
unsigned char sin_zero[8]; /* Padding */
};

/* IPv6 address */
IPv6 Socket address structure: sockaddr_in6
struct in6_addr {
uint8_t s6_addr[16];
};
struct sockaddr_in6 {
uint8_t sin6_len;
sa_family_t sin6_family; /* AF_INET6 */
in_port_t sin6_port;
uint32_t sin6_flowinfo
struct in6_addr sin6_addr;
uint32_t sin6_scope_id;
};