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Netatalk 2.2
17 Dec 1991


Open Source Apple Filing Protocol(AFP) File Server


atalk - AppleTalk protocol family


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


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.


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).


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