ATALK(4)
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).