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 all sent packets will have full checksum coverage.  A
                         value of 8 to 65535 limits the checksum coverage of all sent packets to
                         the value given.

     UDPLITE_RECV_CSCOV  This option is the receiver-side analogue.  A value of zero instructs
                         the kernel to drop all received packets not having full checksum
                         coverage.  A value of 8 to 65535 instructs the kernel to drop all
                         received packets with a partial checksum coverage smaller than the value
                         specified.

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)