UDPLITE(4)             FreeBSD Kernel Interfaces Manual             UDPLITE(4)

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)

FreeBSD 15.1-STABLE-HBSD        October 1, 2014                     UDPLITE(4)