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       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

       Sockets in the AppleTalk protocol family use the following address

           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).


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