udp man page on Ultrix

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udp(4p)								       udp(4p)

Name
       udp - Internet User Datagram Protocol

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

       s = socket(AF_INET, SOCK_DGRAM, 0);

Description
       UDP  is	a simple, unreliable datagram protocol that is used to support
       the SOCK_DGRAM abstraction for the Internet protocol family.  UDP sock‐
       ets are connectionless and are normally used with the and calls, though
       the call can also be used to fix the destination for future packets (in
       which case the or and or 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 (for example,	 a UDP port may not be ``connected'' to a  TCP
       port).	In addition broadcast packets can be sent (assuming the under‐
       lying network supports this) by using a reserved ``broadcast address'';
       this  address  is network interface dependent.  The SO_BROADCAST option
       must be set on the socket for broadcasting to succeed.

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

       [EISCONN]      Try to establish a connection on a socket which  already
		      has one, or when trying to send a datagram with the des‐
		      tination address specified and the socket	 already  con‐
		      nected.

       [ENOTCONN]     Try  to  send  a datagram, but no destination address is
		      specified, and the socket has not been connected.

       [ENOBUFS]      The system runs out  of  memory  for  an	internal  data
		      structure.

       [EADDRINUSE]   An  attempt  is made to create a socket with a port that
		      has already been allocated.

       [EADDRNOTAVAIL]
		      An attempt is made to create a  socket  with  a  network
		      address for which no network interface exists.

See Also
       getsockopt(2), send(2), socket(2) recv(2), intro(4n), inet(4f)

								       udp(4p)
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