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OpenDarwin 7.2.1 - man page for udp (opendarwin section 4)

UDP(4)				   BSD Kernel Interfaces Manual 			   UDP(4)

NAME
     udp -- Internet User Datagram Protocol

SYNOPSIS
     #include <sys/socket.h>
     #include <netinet/in.h>

     int
     socket(AF_INET, SOCK_DGRAM, 0);

DESCRIPTION
     UDP is a simple, unreliable datagram protocol which is used to support the SOCK_DGRAM
     abstraction for the Internet protocol family.  UDP sockets are connectionless, and are nor-
     mally 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).

     UDP address formats are identical to those used by TCP.  In particular UDP provides a port
     identifier in addition to the normal Internet address format.  Note that the UDP port space
     is separate from the TCP port space (i.e. a UDP port may not be ``connected'' to a TCP
     port).  In addition broadcast packets may be sent (assuming the underlying network supports
     this) by using a reserved ``broadcast address''; this address is network interface depen-
     dent.

     Options at the IP transport level may be used with UDP; see ip(4).

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.

SEE ALSO
     getsockopt(2), recv(2), send(2), socket(2), intro(4), inet(4), ip(4)

HISTORY
     The udp protocol appeared in 4.2BSD.

4.2 Berkeley Distribution		   June 5, 1993 		4.2 Berkeley Distribution


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