Add getExportedNamespace NB callback

This callback replaces getVendorNamespace(). Fix nativeloader
to use NativeBridgeGetExportedNamespace instead of
NativeBridgeGetVendorNamespace.

Bug: http://b/121248172
Bug: http://b/121372395
Test: make
Change-Id: I8fa2081e37815f6f65490c9536bed0687b7f1e77

3 files changed, 29 insertions, 6 deletions

diff --git a/libnativebridge/include/nativebridge/native_bridge.h b/libnativebridge/include/nativebridge/native_bridge.h
index 5aea9670b..e9c950025 100644
--- a/libnativebridge/include/nativebridge/native_bridge.h
+++ b/libnativebridge/include/nativebridge/native_bridge.h
@@ -164,8 +164,9 @@ bool NativeBridgeLinkNamespaces(struct native_bridge_namespace_t* from,
 void* NativeBridgeLoadLibraryExt(const char* libpath, int flag,
                                  struct native_bridge_namespace_t* ns);
 
-// Returns vendor namespace if it is enabled for the device and null otherwise
-struct native_bridge_namespace_t* NativeBridgeGetVendorNamespace();
+// Returns exported namespace by the name. This is a reflection of
+// android_get_exported_namespace function. Introduced in v5.
+struct native_bridge_namespace_t* NativeBridgeGetExportedNamespace(const char* name);
 
 // Native bridge interfaces to runtime.
 struct NativeBridgeCallbacks {
@@ -362,7 +363,17 @@ struct NativeBridgeCallbacks {
   //
   // Returns:
   //   vendor namespace or null if it was not set up for the device
+  //
+  // Starting with v5 (Android Q) this function is no longer used.
+  // Use getExportedNamespace() below.
   struct native_bridge_namespace_t* (*getVendorNamespace)();
+
+  // Get native bridge version of exported namespace. Peer of
+  // android_get_exported_namespace(const char*) function.
+  //
+  // Returns:
+  //   exported namespace or null if it was not set up for the device
+  struct native_bridge_namespace_t* (*getExportedNamespace)(const char* name);
 };
 
 // Runtime interfaces to native bridge.
diff --git a/libnativebridge/libnativebridge.map.txt b/libnativebridge/libnativebridge.map.txt
index a616b8526..a6841a3a8 100644
--- a/libnativebridge/libnativebridge.map.txt
+++ b/libnativebridge/libnativebridge.map.txt
@@ -24,7 +24,7 @@ LIBNATIVEBRIDGE_1 {
     NativeBridgeGetError;
     NativeBridgeIsPathSupported;
     NativeBridgeCreateNamespace;
-    NativeBridgeGetVendorNamespace;
+    NativeBridgeGetExportedNamespace;
     NativeBridgeLinkNamespaces;
     NativeBridgeLoadLibraryExt;
     NativeBridgeInitAnonymousNamespace;
diff --git a/libnativebridge/native_bridge.cc b/libnativebridge/native_bridge.cc
index a2d8d81ef..9adba9a50 100644
--- a/libnativebridge/native_bridge.cc
+++ b/libnativebridge/native_bridge.cc
@@ -101,6 +101,8 @@ enum NativeBridgeImplementationVersion {
   NAMESPACE_VERSION = 3,
   // The version with vendor namespaces
   VENDOR_NAMESPACE_VERSION = 4,
+  // The version with runtime namespaces
+  RUNTIME_NAMESPACE_VERSION = 5,
 };
 
 // Whether we had an error at some point.
@@ -610,12 +612,22 @@ bool NativeBridgeLinkNamespaces(native_bridge_namespace_t* from, native_bridge_n
   return false;
 }
 
-native_bridge_namespace_t* NativeBridgeGetVendorNamespace() {
-  if (!NativeBridgeInitialized() || !isCompatibleWith(VENDOR_NAMESPACE_VERSION)) {
+native_bridge_namespace_t* NativeBridgeGetExportedNamespace(const char* name) {
+  if (!NativeBridgeInitialized()) {
     return nullptr;
   }
 
-  return callbacks->getVendorNamespace();
+  if (isCompatibleWith(RUNTIME_NAMESPACE_VERSION)) {
+    return callbacks->getExportedNamespace(name);
+  }
+
+  // sphal is vendor namespace name -> use v4 callback in the case NB callbacks
+  // are not compatible with v5
+  if (isCompatibleWith(VENDOR_NAMESPACE_VERSION) && name != nullptr && strcmp("sphal", name) == 0) {
+    return callbacks->getVendorNamespace();
+  }
+
+  return nullptr;
 }
 
 void* NativeBridgeLoadLibraryExt(const char* libpath, int flag, native_bridge_namespace_t* ns) {