Home Documentation License Download Mailing List Credits

NAME
       spines_setsockopt - Sets the options for a Spines socket


SYNOPSIS
       #include "spines_lib.h"

       int spines_setsockopt(int s, int level, int optname, 
                             const void *optval, socklen_t optlen);


DESCRIPTION

       The spines_setsockopt call is currently used for controlling
       multicast and anycast communication. The parameter s refers to the
       socket connected to Spines, and has to be of type SOCK_DGRAM. The
       rest of the parameters will depend on optname:

       SPINES_ADD_MEMBERSHIP 
           Joins a multicast or anycast group. The optval and
           optlen should refer to the ip_mreq struct containing the
           multicast/anycast group.

       SPINES_DROP_MEMBERSHIP 
           Leaves a multicast or anycast group. The optval and
           optlen should refer to the ip_mreq struct containing the
           multicast/anycast group.

       SPINES_MULTICAST_LOOP 
           Turns on/off the multicast loopback. The optval and optlen
           should refer to a u_char boolean parameter where 0=off and 1=on

       Spines multicast address space is from 224.0.0.0 to 239.255.255.255
       (Class D address). Spines anycast address space is from 240.0.0.0 to
       254.255.255.255 (Class E address).


RETURN VALUE
       On success, zero is returned. On error, -1 is returned.