sockaddr_in6 address structure of the AF_INET6 address family

With the AF_INET6 address family, a name comprises a 16-byte Internet address and a port number. You use the sockaddr_in6 address structure for the AF_INET6 address family.

The sockaddr_in6 structure is declared in the <netinet/in.h> header as follows:

struct sockaddr_in6 {
    sa_family_t     sin6_family;   /* AF_INET6 address family */
    in_port_t       sin6_port;     /* 16-bit port number  */
    uint32_t        sin6_flowinfo;
    struct in6_addr sin6_addr;     /* IPv6 address */
    uint32_t        sin6_scope_id;
};

You can supply a variable server of type struct sockaddr_in6 with a name by using the following statements:

struct sockaddr_in6 server;
struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
...
server.sin6_family = AF_INET6;
server.sin6_port = htons(8888);
memcpy(server.sin6_addr.s6_addr, in6addr_any.s6_addr, 16);

A pointer to the variable server can now be passed as the current parameter, e.g. with a bind() call, to bind the name to a socket:

bind(..., &server, ...);  /* bind() call with type conversion */