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).