atalk

4 17 Dec 1991 @NETATALK_VERSION@

atalk

AppleTalk protocol family

          #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;
        unsigned 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 corresponds 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.