| 17.2
|
Modify the get_ifi_info program to
issue its first SIOCGIFCONF request for one ifreq
structure and then increment the length each time around the loop
by the size of one of these structures. Next, put some statements
in the loop to print the buffer size each time the request is
issued, whether or not ioctl returns an error, and upon
success print the returned buffer length. Run the prifinfo
program and see how your system handles this request when the
buffer size is too small. Also print the address family for any
returned structures whose address family is not the desired value
to see what other structures are returned by your system.
|
| 17.3
|
Modify the get_ifi_info function to
return information about an alias address if the additional address
is on a different subnet from the previous address for this
interface. That is, our version in Section 17.6
ignored the aliases 206.62.226.44 through 206.62.226.46, which is
acceptable since they are on the same subnet as the primary address
for the interface, 206.62.226.33. But if, in this example, an alias
is on a different subnet, say 192.3.4.5, return an
ifi_info structure with the information about the
additional address.
|
