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addrinfo

TCP/IP address information

Synopsis:

struct addrinfo {
    int ai_flags;
    int ai_family;
    int ai_socktype;
    int ai_protocol;
    size_t ai_addrlen;
    char * ai_canonname;
    struct sockaddr * ai_addr;
    struct addrinfo * ai_next
};

Description:

The addrinfo structure describes address information for use with TCP/IP. To get this information, call getaddrinfo(); to free a linked list of these structures, call freeaddrinfo().

The addrinfo structure includes these members:

ai_flags

Flags. Includes AI_PASSIVE, AI_CANONNAME, and AI_NUMERICHOST. For a complete list, see <netdb.h>.

ai_family

Protocol family. Includes PF_UNSPEC and PF_INET. For a complete list, see <sys/socket.h>.

ai_socktype

Socket type. Includes SOCK_STREAM and SOCK_DGRAM. For a complete list, see <sys/socket.h>.

ai_protocol

Protocol. Includes IPPROTO_TCP and IPPROTO_UDP. For a complete list, see <netinet/in.h>.

ai_addrlen

The length of the ai_addr member.

ai_canonname

The canonical name for nodename.

ai_addr

Binary socket address.

ai_next

A pointer to the next addrinfo structure in the linked list.

Classification:

POSIX 1003.1

See also:

freeaddrinfo(), gai_strerror(), getaddrinfo()