UDP man page on HP-UX

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UDP(7P)								       UDP(7P)

       UDP - Internet User Datagram Protocol

       UDP  is	a  simple,  unreliable	datagram  protocol used to support the
       socket type for the internet protocol family.  UDP sockets are  connec‐
       tionless,  and  are  normally  used with the and calls (see send(2) and
       recv(2).	 The call can also be used to simulate a connection (see  con‐
       nect(2).	 When used in this manner, it fixes the destination for future
       transmitted packets (in which case the or system calls can be used), as
       well  as	 designating  the source from which packets are received.  The
       and calls can be used at any time if the source of the message is unim‐

       UDP address formats are identical to those used by TCP.	In particular,
       UDP requires a port identifier  in  addition  to	 the  normal  Internet
       address format.	Note that the UDP port domain is separate from the TCP
       port domain (in other words, a UDP port cannot be connected  to	a  TCP

       The  default  send  buffer  size	 for  UDP sockets is 65535 bytes.  The
       default receive buffer size for UDP sockets is 2147483647  bytes.   The
       send  and  receive buffer sizes for UDP sockets can be set by using the
       and options of the system call or the and options of the	 system	 call.
       The  maximum  size  for	these buffers is 2147483647 bytes. The maximum
       receive buffer size may be lowered using the parameter

       The maximum message size for a UDP datagram socket is  limited  by  the
       lesser  of  the	maximum size of an IP datagram and the size of the UDP
       datagram socket buffer.	The maximum size of an IP datagram limits  the
       maximum message size of a UDP message to 65507 bytes.  Therefore, using
       the maximum socket buffer size will allow multiple  maximum-sized  mes‐
       sages to be placed on the send queue.  The default inbound and outbound
       message size limit for a UDP datagram socket is 65535 bytes.

       The maximum message size for a UDP broadcast is limited by the MTU size
       of the underlying link.

       One  of	the  following errors may be returned in if a socket operation
       fails.  For a more detailed list of errors, see the man pages for  spe‐
       cific system calls.

	      [EISCONN]		    Attempt to send a datagram with the desti‐
				    nation address specified, when the	socket
				    is already connected.

	      [ENOBUFS]		    No buffer space is available for an inter‐
				    nal data structure.

	      [EADDRINUSE]	    Attempt to create a	 socket	 with  a  port
				    which has already been allocated.

	      [EADDRNOTAVAIL]	    Attempt  to create a socket with a network
				    address for	 which	no  network  interface

       The  socket interfaces to UDP were developed by the University of Cali‐
       fornia, Berkeley.

       ndd(1M).	 getsockopt(2), recv(2), send(2), socket(2), t_open(3), t_opt‐
       mgmt(3) inet(7F), socket(7),

       RFC 768	      User Datagram Protocol
       RFC 1122	      Requirements for Internet hosts


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