libbinder: build option to disable the kernel IPC, part 1/2

Add a new BINDER_WITH_KERNEL_IPC macro to enable all code that
uses IPCThreadState or ProcessState. This macro is defined for
Android libbinder but left out for non-Android builds.

Bug: 224644083
Test: m
Change-Id: I622757fcc0f9885dbf271c0ffa84c54938d50774

1 files changed, 4 insertions, 2 deletions

diff --git a/libs/binder/RpcState.cpp b/libs/binder/RpcState.cpp
index 01311b505f..bde3d90d90 100644
--- a/libs/binder/RpcState.cpp
+++ b/libs/binder/RpcState.cpp
@@ -36,7 +36,6 @@
 
 namespace android {
 
-using base::ScopeGuard;
 using base::StringPrintf;
 
 #if RPC_FLAKE_PRONE
@@ -733,6 +732,7 @@ status_t RpcState::processCommand(
         const sp<RpcSession::RpcConnection>& connection, const sp<RpcSession>& session,
         const RpcWireHeader& command, CommandType type,
         std::vector<std::variant<base::unique_fd, base::borrowed_fd>>&& ancillaryFds) {
+#ifdef BINDER_WITH_KERNEL_IPC
     IPCThreadState* kernelBinderState = IPCThreadState::selfOrNull();
     IPCThreadState::SpGuard spGuard{
             .address = __builtin_frame_address(0),
@@ -742,11 +742,13 @@ status_t RpcState::processCommand(
     if (kernelBinderState != nullptr) {
         origGuard = kernelBinderState->pushGetCallingSpGuard(&spGuard);
     }
-    ScopeGuard guardUnguard = [&]() {
+
+    base::ScopeGuard guardUnguard = [&]() {
         if (kernelBinderState != nullptr) {
             kernelBinderState->restoreGetCallingSpGuard(origGuard);
         }
     };
+#endif // BINDER_WITH_KERNEL_IPC
 
     switch (command.command) {
         case RPC_COMMAND_TRANSACT: