[ns] Fwd: Handoff in Satellite Networks

[Rodolpho Iemini Atoji]

Hello,

I'm trying to build a list of link durations of all interplane ISLs,
by modifying sathandoff.cc.

The idea is to know when a link between two satellites has been
established and when it has been dropped, among all the process of
handoffs.

I've been trying a code like this:

       LinkHandoffMgr* changedLink = (...);
       SatLinkHead* slhp;
       SatNode *peer;
       SatNode* node = (SatNode*)changedLink->node();

       for (slhp = (SatLinkHead*) node->linklisthead().lh_first;
              slhp;
              slhp = (SatLinkHead*) slhp->nextlinkhead()) {
               peer = changedLink->get_peer(slhp);
               if (peer) {
                       if (slhp->linkup_) {
                               printf("Link UP between %d and %d at %d\n",
                                          node->address(),
peer->address(), NOW);
                       } else {
                               printf("Link DOWN between %d and %d at %d\n",
                                          node->address(),
peer->address(), NOW);
                       }
               }
       }

But I'm a little confused about 'if (slhp->linkup_)'.
This checking is done only when exists another node in the link.
Documentation says that linkup_ is TRUE when the link to another node
on the channel is up. But what means linkup_ == FALSE if peer != NULL?
Maybe this is not the correct way to achieve the results I want...
Corrections are welcome.

(I hope this is the correct list for posts like this)

Thanks in advance,

Rodolpho