Add linkToDeath support for RPC binder so a client can act on disconnect
This requires an incoming thread to be listening to the connection in
order to be notified.
Test: atest binderRpcTest
Test: atest binderRpcTestSingleThreaded
Bug: 182939380
Change-Id: I3746de6e8cff99bb267867c5dc60a6815b19fb92
diff --git a/libs/binder/RpcState.cpp b/libs/binder/RpcState.cpp
index 28730ff..e3ff64d 100644
--- a/libs/binder/RpcState.cpp
+++ b/libs/binder/RpcState.cpp
@@ -226,6 +226,30 @@
return OK;
}
+status_t RpcState::sendObituaries(const sp<RpcSession>& session) {
+ RpcMutexUniqueLock _l(mNodeMutex);
+
+ // Gather strong pointers to all of the remote binders for this session so
+ // we hold the strong references. remoteBinder() returns a raw pointer.
+ // Send the obituaries and drop the strong pointers outside of the lock so
+ // the destructors and the onBinderDied calls are not done while locked.
+ std::vector<sp<IBinder>> remoteBinders;
+ for (const auto& [_, binderNode] : mNodeForAddress) {
+ if (auto binder = binderNode.binder.promote()) {
+ remoteBinders.push_back(std::move(binder));
+ }
+ }
+ _l.unlock();
+
+ for (const auto& binder : remoteBinders) {
+ if (binder->remoteBinder() &&
+ binder->remoteBinder()->getPrivateAccessor().rpcSession() == session) {
+ binder->remoteBinder()->sendObituary();
+ }
+ }
+ return OK;
+}
+
size_t RpcState::countBinders() {
RpcMutexLockGuard _l(mNodeMutex);
return mNodeForAddress.size();