DDP(4P)

NAME
ddp - AppleTalk Datagram Delivery Protocol

SYNOPSIS
#include <sys/socket.h>
#include <netat/atalk.h>

s = socket(AF_APPLETALK, SOCK_DGRAM, 0);

DESCRIPTION
DDP is a simple, unreliable datagram protocol which is used to support the SOCK_DGRAM abstraction for the AppleTalk protocol family. DDP sockets are connectionless, and are normally used with the sendto and recvfrom calls, though the connect(2) call may also be used to fix the destination for future packets (in which case the recv(2) or read(2) and send(2) or write(2) system calls may be used).

DIAGNOSTICS
A socket operation may fail with one of the following errors returned:

[EISCONN]
    when trying to establish a connection on a socket which already has one, or when trying to send a datagram with the destination address specified and the socket is already connected;

[ENOTCONN]
    when trying to send a datagram, but no destination address is specified, and the socket hasn't been connected;

[ENOBUFS]
    when the system runs out of memory for an internal data structure;

[EADDRINUSE]
    when an attempt is made to create a socket with a port which has already been allocated;

[EADDRNOTAVAIL]
    when an attempt is made to create a socket with a network address for which no network interface exists;

[EINVAL]
    when an an invalid DDP request is made;

[EAFNOSUPPORT]
    when the address family is not equal to AF_APPLETALK for a bind operation.

SEE ALSO
send(2), recv(2), intro(4N), appletalk(4F)