pSOSystem System Calls - Read

pNA+ System Calls ioctl
struct arpreq {
struct sockaddr arp_pa; /* protocol address */
struct sockaddr arp_ha; /* hardware address */
int arp_flags; /* flags */
};
The arp_pa structure is used to specify the host’s IP address. The address family
field in arp_pa must be AF_INET. The arp_ha structure is used to specify the
host’s hardware address. The arp_ha address field must be AF_UNSPEC.
arp_flags must be one of the following symbolic constants, defined in pna.h:
Symbolic Constant Description
ATF_PERM Permanent entry.
ATF_PUBL Publish (respond for other host.)
ATF_PERM makes the entry permanent if the ioctl() call succeeds. ATF_PUBL
specifies that the ARP protocol should respond to ARP requests coming from other
machines for the indicated host. This allows a host to act as an ARP server, which
might be useful in convincing an ARP-only machine to talk to a non-ARP machine.
Routing-Related Operations
The following operations are available for manipulating the Routing Table:
Operation Description
SIOCADDRT Adds a routing table entry.
SIOCDELRT Deletes a routing table entry.
SIOCMODRT Modifies a routing table entry.
For all Routing-related operations, arg must point to struct rtentry. If a subnet
mask must be specified with the route, the rt_flags field must have the
RTF_MASK flag set and the rt_netmask field must be filled with the subnet mask.
The interface number of the route’s output interface can be specified. Usually this is
computed internally. But for unnumbered point-point links, for instance, you could
specify an interface. The rt_ifno field is ignored unless the RTF_INTF flag is set.
struct rtentry {
struct sockaddr rt_dst; /* Specifies the destination
* IP address of the route. */
struct sockaddr rt_gateway; /* Specifies the gateway
pSOSystem System Calls 4-27
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