pSOSystem System Calls - Read

pNA+ System Calls setsockopt
IP_DROP_MEMBERSHIP_INTF Similar to IP_DROP_MEMBERSHIP above. The
optval is a pointer to the structure
ip_mreq_intf (defined in ). The only
difference is that the interface is defined using
the interface number. If the interface number is
specified as -1 then pNA+ will select the interface
based upon the routing table. This option is useful
for unnumbered links because the IP address
of the interface is not enough to identify the interface.
The structure below is defined in and
used with the IP_DROP_MEMBERSHIP_INTF
option.
struct ip_mreq_intf {
struct in_addr imrif_mcastaddr;
/* IP multicast address of group */
long imrif_ifno;
/* local interface number */
};
IP_HDRINCL Specifies that the IP header will be included in the
output packets. The following fields will be set by
pNA+ if they are set to 0 in the included IP
header: IP identification number and IP source
address. The fragmentation offset and checksum
fields are always computed by pNA+. The rest of
the IP header fields must be set appropriately.
IP_MULTICAST_IF Specifies the outgoing interface for multicast
packets. optval is a pointer to struct in_addr.
If set to INADDR_ANY then the routing table will
be used to select an appropriate interface.
IP_MULTICAST_INTF Specifies the outgoing interface for multicast
packets. The outgoing interface is defined by its
interface number. The optval is a pointer to a
long. If set to -1 then the routing table will be
used to select an appropriate interface. This option
is useful for unnumbered links because the
IP address of the interface is not enough to identify
the interface.
pSOSystem System Calls 4-71
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