libbinder_ndk: Add stability downgrade
This can be used to allow registering a service with a VINTF interface
without requiring a manifest declaration.
This is useful for test services or in the case of a system proxy
service that implements the same interface as the vintf service.
Bug: 183154648
Bug: 177664629
Test: atest binderStabilityTest
Change-Id: Ibd8dad46945a339b77dca70484082fda06220ee3
diff --git a/libs/binder/ndk/include_platform/android/binder_stability.h b/libs/binder/ndk/include_platform/android/binder_stability.h
index ce7255e..0973f2c 100644
--- a/libs/binder/ndk/include_platform/android/binder_stability.h
+++ b/libs/binder/ndk/include_platform/android/binder_stability.h
@@ -45,6 +45,18 @@
AIBinder_markVendorStability(binder);
}
+/**
+ * Given a binder interface at a certain stability, there may be some
+ * requirements associated with that higher stability level. For instance, a
+ * VINTF stability binder is required to be in the VINTF manifest. This API
+ * can be called to use that same interface within the vendor partition.
+ */
+void AIBinder_forceDowngradeToVendorStability(AIBinder* binder);
+
+static inline void AIBinder_forceDowngradeToLocalStability(AIBinder* binder) {
+ AIBinder_forceDowngradeToVendorStability(binder);
+}
+
#else // defined(__ANDROID_VENDOR__)
enum {
@@ -62,6 +74,18 @@
AIBinder_markSystemStability(binder);
}
+/**
+ * Given a binder interface at a certain stability, there may be some
+ * requirements associated with that higher stability level. For instance, a
+ * VINTF stability binder is required to be in the VINTF manifest. This API
+ * can be called to use that same interface within the system partition.
+ */
+void AIBinder_forceDowngradeToSystemStability(AIBinder* binder);
+
+static inline void AIBinder_forceDowngradeToLocalStability(AIBinder* binder) {
+ AIBinder_forceDowngradeToSystemStability(binder);
+}
+
#endif // defined(__ANDROID_VENDOR__)
/**
diff --git a/libs/binder/ndk/libbinder_ndk.map.txt b/libs/binder/ndk/libbinder_ndk.map.txt
index f1db653..67c85b6 100644
--- a/libs/binder/ndk/libbinder_ndk.map.txt
+++ b/libs/binder/ndk/libbinder_ndk.map.txt
@@ -127,6 +127,9 @@
AServiceManager_tryUnregister; # llndk
AServiceManager_reRegister; # llndk
+ AIBinder_forceDowngradeToSystemStability; # apex
+ AIBinder_forceDowngradeToVendorStability; # llndk
+
AIBinder_Class_getDescriptor;
AIBinder_Weak_clone;
AIBinder_Weak_lt;
diff --git a/libs/binder/ndk/stability.cpp b/libs/binder/ndk/stability.cpp
index a5b3ece..7eafb9c 100644
--- a/libs/binder/ndk/stability.cpp
+++ b/libs/binder/ndk/stability.cpp
@@ -31,7 +31,7 @@
#error libbinder_ndk should only be built in a system context
#endif
-// explicit extern because symbol is only declared in header when __ANDROID_VNDK__
+// explicit extern because symbol is only declared in header when __ANDROID_VENDOR__
extern "C" void AIBinder_markVendorStability(AIBinder* binder) {
Stability::markVndk(binder->getBinder().get());
}
@@ -43,3 +43,12 @@
void AIBinder_markVintfStability(AIBinder* binder) {
Stability::markVintf(binder->getBinder().get());
}
+
+// explicit extern because symbol is only declared in header when __ANDROID_VENDOR__
+extern "C" void AIBinder_forceDowngradeToVendorStability(AIBinder* binder) {
+ Stability::forceDowngradeToVendorStability(binder->getBinder());
+}
+
+void AIBinder_forceDowngradeToSystemStability(AIBinder* binder) {
+ Stability::forceDowngradeToSystemStability(binder->getBinder());
+}