libbinder : Avoid waiting in binder_rpc_fuzzer

Introducing new APIs in RpcServer and RpcSession to check
polling state of file descriptor. Removing fixed wait time
in binder_rpc_fuzzer.

Test: m binder_rpc_fuzzer &&
$ANDROID_HOST_OUT/fuzz/x86_64/binder_rpc_fuzzer/binder_rpc_fuzzer
Bug: 218518615

Change-Id: Ied82cd9c16514761a489731488924274a17053a6

1 files changed, 20 insertions, 0 deletions

diff --git a/libs/binder/RpcSession.cpp b/libs/binder/RpcSession.cpp
index bef2ed63c7..49843e5953 100644
--- a/libs/binder/RpcSession.cpp
+++ b/libs/binder/RpcSession.cpp
@@ -952,4 +952,24 @@ RpcSession::ExclusiveConnection::~ExclusiveConnection() {
     }
 }
 
+bool RpcSession::hasActiveConnection(const std::vector<sp<RpcConnection>>& connections) {
+    for (const auto& connection : connections) {
+        if (connection->exclusiveTid != std::nullopt && !connection->rpcTransport->isWaiting()) {
+            return true;
+        }
+    }
+    return false;
+}
+
+bool RpcSession::hasActiveRequests() {
+    RpcMutexUniqueLock _l(mMutex);
+    if (hasActiveConnection(mConnections.mIncoming)) {
+        return true;
+    }
+    if (hasActiveConnection(mConnections.mOutgoing)) {
+        return true;
+    }
+    return mConnections.mWaitingThreads != 0;
+}
+
 } // namespace android