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## Name

atalk — AppleTalk protocol family

## Synopsis

    #include <sys/types.h>
    #include <netatalk/at.h>

## DESCRIPTION

The AppleTalk protocol family is a collection of protocols layered above the Datagram Delivery Protocol (DDP), and using AppleTalk address format. The AppleTalk family may provide SOCK_STREAM (ADSP), SOCK_DGRAM (DDP), SOCK_RDM (ATP), and SOCK_SEQPACKET (ASP). Currently, only DDP is implemented in the kernel; ATP and ASP are implemented in user level libraries; and ADSP is planned.

## ADDRESSING

AppleTalk addresses are three byte quantities, stored in network byte order. The include file <netatalk/at.h> defines the AppleTalk address format.

Sockets in the AppleTalk protocol family use the following address structure:

    struct sockaddr_at {
        short sat_family;
        u_char sat_port;
        struct at_addr sat_addr;
        char sat_zero[ 8 ];
    };

The port of a socket may be set with bind(2). The node for bind must always be ATADDR_ANYNODE: ``this node.'' The net may be ATADDR_ANYNET or ATADDR_LATENET. ATADDR_ANYNET coresponds to the machine's ``primary'' address (the first configured). ATADDR_LATENET causes the address in outgoing packets to be determined when a packet is sent, i.e. determined late. ATADDR_LATENET is equivalent to opening one socket for each network interface. The port of a socket and either the primary address or ATADDR_LATENET are returned with getsockname(2).

## SEE ALSO

bind(2), getsockname(2), atalkd(8).

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