summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--libs/binder/ndk/AIBinder.cpp97
-rw-r--r--libs/binder/ndk/AIBinder_internal.h26
-rw-r--r--libs/binder/ndk/AParcel.cpp10
-rw-r--r--libs/binder/ndk/AServiceManager.cpp6
-rw-r--r--libs/binder/ndk/include_ndk/android/binder_ibinder.h7
-rw-r--r--libs/binder/ndk/test/iface.cpp7
6 files changed, 80 insertions, 73 deletions
diff --git a/libs/binder/ndk/AIBinder.cpp b/libs/binder/ndk/AIBinder.cpp
index d0ce98db93..fe07914c04 100644
--- a/libs/binder/ndk/AIBinder.cpp
+++ b/libs/binder/ndk/AIBinder.cpp
@@ -28,14 +28,29 @@ using ::android::sp;
using ::android::String16;
using ::android::wp;
+namespace ABBinderTag {
+
+static const void* kId = "ABBinder";
+static void* kValue = static_cast<void*>(new bool{true});
+void cleanId(const void* /*id*/, void* /*obj*/, void* /*cookie*/){/* do nothing */};
+
+static void attach(const sp<IBinder>& binder) {
+ binder->attachObject(kId, kValue, nullptr /*cookie*/, cleanId);
+}
+static bool has(const sp<IBinder>& binder) {
+ return binder != nullptr && binder->findObject(kId) == kValue;
+}
+
+} // namespace ABBinderTag
+
AIBinder::AIBinder(const AIBinder_Class* clazz) : mClazz(clazz) {}
AIBinder::~AIBinder() {}
-sp<AIBinder> AIBinder::associateClass(const AIBinder_Class* clazz) {
+bool AIBinder::associateClass(const AIBinder_Class* clazz) {
using ::android::String8;
- if (clazz == nullptr) return nullptr;
- if (mClazz == clazz) return this;
+ if (clazz == nullptr) return false;
+ if (mClazz == clazz) return true;
String8 newDescriptor(clazz->getInterfaceDescriptor());
@@ -45,42 +60,31 @@ sp<AIBinder> AIBinder::associateClass(const AIBinder_Class* clazz) {
LOG(ERROR) << __func__ << ": Class descriptors '" << currentDescriptor
<< "' match during associateClass, but they are different class objects. "
"Class descriptor collision?";
- return nullptr;
+ } else {
+ LOG(ERROR) << __func__
+ << ": Class cannot be associated on object which already has a class. "
+ "Trying to associate to '"
+ << newDescriptor.c_str() << "' but already set to '"
+ << currentDescriptor.c_str() << "'.";
}
- LOG(ERROR) << __func__
- << ": Class cannot be associated on object which already has a class. Trying to "
- "associate to '"
- << newDescriptor.c_str() << "' but already set to '" << currentDescriptor.c_str()
- << "'.";
- return nullptr;
+ // always a failure because we know mClazz != clazz
+ return false;
}
+ CHECK(asABpBinder() != nullptr); // ABBinder always has a descriptor
+
String8 descriptor(getBinder()->getInterfaceDescriptor());
if (descriptor != newDescriptor) {
LOG(ERROR) << __func__ << ": Expecting binder to have class '" << newDescriptor.c_str()
<< "' but descriptor is actually '" << descriptor.c_str() << "'.";
- return nullptr;
- }
-
- // The descriptor matches, so if it is local, this is guaranteed to be the libbinder_ndk class.
- // An error here can occur if there is a conflict between descriptors (two unrelated classes
- // define the same descriptor), but this should never happen.
-
- // if this is a local ABBinder, mClazz should be non-null
- CHECK(asABBinder() == nullptr);
- CHECK(asABpBinder() != nullptr);
-
- if (!isRemote()) {
- // ABpBinder but proxy to a local object. Therefore that local object must be an ABBinder.
- ABBinder* binder = static_cast<ABBinder*>(getBinder().get());
- return binder;
+ return false;
}
- // This is a remote object
+ // if this is a local object, it's not one known to libbinder_ndk
mClazz = clazz;
- return this;
+ return true;
}
ABBinder::ABBinder(const AIBinder_Class* clazz, void* userData)
@@ -111,12 +115,22 @@ binder_status_t ABBinder::onTransact(transaction_code_t code, const Parcel& data
}
}
-ABpBinder::ABpBinder(::android::sp<::android::IBinder> binder)
+ABpBinder::ABpBinder(const ::android::sp<::android::IBinder>& binder)
: AIBinder(nullptr /*clazz*/), BpRefBase(binder) {
CHECK(binder != nullptr);
}
ABpBinder::~ABpBinder() {}
+sp<AIBinder> ABpBinder::fromBinder(const ::android::sp<::android::IBinder>& binder) {
+ if (binder == nullptr) {
+ return nullptr;
+ }
+ if (ABBinderTag::has(binder)) {
+ return static_cast<ABBinder*>(binder.get());
+ }
+ return new ABpBinder(binder);
+}
+
struct AIBinder_Weak {
wp<AIBinder> binder;
};
@@ -162,9 +176,11 @@ AIBinder* AIBinder_new(const AIBinder_Class* clazz, void* args) {
void* userData = clazz->onCreate(args);
- AIBinder* ret = new ABBinder(clazz, userData);
- AIBinder_incStrong(ret);
- return ret;
+ sp<AIBinder> ret = new ABBinder(clazz, userData);
+ ABBinderTag::attach(ret->getBinder());
+
+ AIBinder_incStrong(ret.get());
+ return ret.get();
}
bool AIBinder_isRemote(AIBinder* binder) {
@@ -200,23 +216,12 @@ int32_t AIBinder_debugGetRefCount(AIBinder* binder) {
return binder->getStrongCount();
}
-void AIBinder_associateClass(AIBinder** binder, const AIBinder_Class* clazz) {
- if (binder == nullptr || *binder == nullptr) {
- return;
- }
-
- sp<AIBinder> result = (*binder)->associateClass(clazz);
-
- // This function takes one refcount of 'binder' and delivers one refcount of 'result' to the
- // callee. First we give the callee their refcount and then take it away from binder. This is
- // done in this order in order to handle the case that the result and the binder are the same
- // object.
- if (result != nullptr) {
- AIBinder_incStrong(result.get());
+bool AIBinder_associateClass(AIBinder* binder, const AIBinder_Class* clazz) {
+ if (binder == nullptr) {
+ return false;
}
- AIBinder_decStrong(*binder);
- *binder = result.get(); // Maybe no-op
+ return binder->associateClass(clazz);
}
const AIBinder_Class* AIBinder_getClass(AIBinder* binder) {
diff --git a/libs/binder/ndk/AIBinder_internal.h b/libs/binder/ndk/AIBinder_internal.h
index d44b937ec7..ed3b37b9f2 100644
--- a/libs/binder/ndk/AIBinder_internal.h
+++ b/libs/binder/ndk/AIBinder_internal.h
@@ -35,24 +35,14 @@ struct AIBinder : public virtual ::android::RefBase {
AIBinder(const AIBinder_Class* clazz);
virtual ~AIBinder();
- // This returns an AIBinder object with this class associated. If the class is already
- // associated, 'this' will be returned. If there is a local AIBinder implementation, that will
- // be returned. If this is a remote object, the class will be associated and this will be ready
- // to be used for transactions.
- ::android::sp<AIBinder> associateClass(const AIBinder_Class* clazz);
+ bool associateClass(const AIBinder_Class* clazz);
const AIBinder_Class* getClass() const { return mClazz; }
- // This does not create the binder if it does not exist in the process.
virtual ::android::sp<::android::IBinder> getBinder() = 0;
virtual ABBinder* asABBinder() { return nullptr; }
virtual ABpBinder* asABpBinder() { return nullptr; }
- bool isRemote() {
- auto binder = getBinder();
- // if the binder is nullptr, then it is a local object which hasn't been sent out of process
- // yet.
- return binder != nullptr && binder->remoteBinder() != nullptr;
- }
+ bool isRemote() { return getBinder()->remoteBinder() != nullptr; }
private:
// AIBinder instance is instance of this class for a local object. In order to transact on a
@@ -63,7 +53,6 @@ private:
// This is a local AIBinder object with a known class.
struct ABBinder : public AIBinder, public ::android::BBinder {
- ABBinder(const AIBinder_Class* clazz, void* userData);
virtual ~ABBinder();
void* getUserData() { return mUserData; }
@@ -76,6 +65,11 @@ struct ABBinder : public AIBinder, public ::android::BBinder {
::android::Parcel* reply, binder_flags_t flags) override;
private:
+ ABBinder(const AIBinder_Class* clazz, void* userData);
+
+ // only thing that should create an ABBinder
+ friend AIBinder* AIBinder_new(const AIBinder_Class*, void*);
+
// Can contain implementation if this is a local binder. This can still be nullptr for a local
// binder. If it is nullptr, the implication is the implementation state is entirely external to
// this object and the functionality provided in the AIBinder_Class is sufficient.
@@ -85,11 +79,15 @@ private:
// This binder object may be remote or local (even though it is 'Bp'). It is not yet associated with
// a class.
struct ABpBinder : public AIBinder, public ::android::BpRefBase {
- ABpBinder(::android::sp<::android::IBinder> binder);
+ static ::android::sp<AIBinder> fromBinder(const ::android::sp<::android::IBinder>& binder);
+
virtual ~ABpBinder();
::android::sp<::android::IBinder> getBinder() override { return remote(); }
ABpBinder* asABpBinder() override { return this; }
+
+private:
+ ABpBinder(const ::android::sp<::android::IBinder>& binder);
};
struct AIBinder_Class {
diff --git a/libs/binder/ndk/AParcel.cpp b/libs/binder/ndk/AParcel.cpp
index b63b138dc4..f39e7321af 100644
--- a/libs/binder/ndk/AParcel.cpp
+++ b/libs/binder/ndk/AParcel.cpp
@@ -34,8 +34,9 @@ binder_status_t AParcel_readStrongBinder(const AParcel* parcel, AIBinder** binde
if (status != EX_NONE) {
return status;
}
- *binder = new ABpBinder(readBinder);
- AIBinder_incStrong(*binder);
+ sp<AIBinder> ret = ABpBinder::fromBinder(readBinder);
+ AIBinder_incStrong(ret.get());
+ *binder = ret.get();
return status;
}
binder_status_t AParcel_readNullableStrongBinder(const AParcel* parcel, AIBinder** binder) {
@@ -44,8 +45,9 @@ binder_status_t AParcel_readNullableStrongBinder(const AParcel* parcel, AIBinder
if (status != EX_NONE) {
return status;
}
- *binder = new ABpBinder(readBinder);
- AIBinder_incStrong(*binder);
+ sp<AIBinder> ret = ABpBinder::fromBinder(readBinder);
+ AIBinder_incStrong(ret.get());
+ *binder = ret.get();
return status;
}
diff --git a/libs/binder/ndk/AServiceManager.cpp b/libs/binder/ndk/AServiceManager.cpp
index f61b914089..3979945e45 100644
--- a/libs/binder/ndk/AServiceManager.cpp
+++ b/libs/binder/ndk/AServiceManager.cpp
@@ -41,7 +41,7 @@ AIBinder* AServiceManager_getService(const char* instance) {
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder = sm->getService(String16(instance));
- AIBinder* ret = new ABpBinder(binder);
- AIBinder_incStrong(ret);
- return ret;
+ sp<AIBinder> ret = ABpBinder::fromBinder(binder);
+ AIBinder_incStrong(ret.get());
+ return ret.get();
}
diff --git a/libs/binder/ndk/include_ndk/android/binder_ibinder.h b/libs/binder/ndk/include_ndk/android/binder_ibinder.h
index 23136a2de8..fb82ab6ba9 100644
--- a/libs/binder/ndk/include_ndk/android/binder_ibinder.h
+++ b/libs/binder/ndk/include_ndk/android/binder_ibinder.h
@@ -167,11 +167,10 @@ int32_t AIBinder_debugGetRefCount(AIBinder* binder);
* However, if an object is just intended to be passed through to another process or used as a
* handle this need not be called.
*
- * The binder parameter may or may not be updated. If it is updated, the ownership of the original
- * object is transferred to the new object. If the class association fails, ownership of the binder
- * is lost, and it is set to nullptr.
+ * This returns true if the class association succeeds. If it fails, no change is made to the
+ * binder object.
*/
-void AIBinder_associateClass(AIBinder** binder, const AIBinder_Class* clazz);
+bool AIBinder_associateClass(AIBinder* binder, const AIBinder_Class* clazz);
/*
* Returns the class that this binder was constructed with or associated with.
diff --git a/libs/binder/ndk/test/iface.cpp b/libs/binder/ndk/test/iface.cpp
index eed09f02c7..1317a74c59 100644
--- a/libs/binder/ndk/test/iface.cpp
+++ b/libs/binder/ndk/test/iface.cpp
@@ -118,12 +118,15 @@ binder_status_t IFoo::addService(const char* instance) {
sp<IFoo> IFoo::getService(const char* instance) {
AIBinder* binder = AServiceManager_getService(instance); // maybe nullptr
- AIBinder_associateClass(&binder, IFoo::kClass);
-
if (binder == nullptr) {
return nullptr;
}
+ if (!AIBinder_associateClass(binder, IFoo::kClass)) {
+ AIBinder_decStrong(binder);
+ return nullptr;
+ }
+
if (AIBinder_isRemote(binder)) {
sp<IFoo> ret = new BpFoo(binder); // takes ownership of binder
return ret;
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-12-08 13:59:54 +0000