NAME

       udplite — Lightweight User Datagram Protocol

SYNOPSIS

       #include <sys/types.h>
       #include <sys/socket.h>
       #include <netinet/udplite.h>

       int
       socket(AF_INET, SOCK_DGRAM, IPPROTO_UDPLITE);

DESCRIPTION

       The UDP-Lite protocol provides a partial checksum which allows corrupted packets to be transmitted to the
       receiving  application.   This  has advantages for some types of multimedia transport that may be able to
       make use of slightly damaged datagrams, rather than having them discarded by lower-layer protocols.

       UDP-Lite supports a number of socket options  which  can  be  set  with  setsockopt(2)  and  tested  with
       getsockopt(2):

       UDPLITE_SEND_CSCOV  This  option  sets  the sender checksum coverage.  A value of zero indicates that the
                           entire packet is covered by the checksum.  A value of 1 to 7 must be discarded by the
                           receiver.

       UDPLITE_RECV_CSCOV  This option is the receiver-side analogue.  It is truly optional, i.e.  not  required
                           to  enable traffic with partial checksum coverage.  Its function is that of a traffic
                           filter: when enabled, it instructs the kernel  to  drop  all  packets  which  have  a
                           coverage less than this value.

ERRORS

       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 has not 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)

Debian                                            April 7, 2014                                       UDPLITE(4)