Implement "getchaintips" RPC command to monitor blockchain forks.

Port over https://github.com/chronokings/huntercoin/pull/19 from
Huntercoin:  This implements a new RPC command "getchaintips" that can be
used to find all currently active chain heads.  This is similar to the
-printblocktree startup option, but it can be used without restarting
just via the RPC interface on a running daemon.

1 files changed, 3 insertions, 3 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 353cde0bd7..cf9318fedf 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -444,7 +444,7 @@ CBlockIndex *CChain::FindFork(const CBlockLocator &locator) const {
     return Genesis();
 }
 
-CBlockIndex *CChain::FindFork(CBlockIndex *pindex) const {
+const CBlockIndex *CChain::FindFork(const CBlockIndex *pindex) const {
     if (pindex->nHeight > Height())
         pindex = pindex->GetAncestor(Height());
     while (pindex && !Contains(pindex))
@@ -2067,8 +2067,8 @@ static CBlockIndex* FindMostWorkChain() {
 static bool ActivateBestChainStep(CValidationState &state, CBlockIndex *pindexMostWork) {
     AssertLockHeld(cs_main);
     bool fInvalidFound = false;
-    CBlockIndex *pindexOldTip = chainActive.Tip();
-    CBlockIndex *pindexFork = chainActive.FindFork(pindexMostWork);
+    const CBlockIndex *pindexOldTip = chainActive.Tip();
+    const CBlockIndex *pindexFork = chainActive.FindFork(pindexMostWork);
 
     // Disconnect active blocks which are no longer in the best chain.
     while (chainActive.Tip() && chainActive.Tip() != pindexFork) {