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).