Use waitForDeclaredService to get Lights HAL (9e118130) · Commits · e / os / android_frameworks_base

core/java/android/os/ServiceManager.java

+39 −0

Original line number	Diff line number	Diff line
		@@ -16,6 +16,7 @@

		package android.os;

		import android.annotation.NonNull;
		import android.compat.annotation.UnsupportedAppUsage;
		import android.util.ArrayMap;
		import android.util.Log;
		@@ -218,6 +219,44 @@ public final class ServiceManager {
		}
		}

		/**
		* Returns whether the specified service is declared.
		*
		* @return true if the service is declared somewhere (eg. VINTF manifest) and
		* waitForService should always be able to return the service.
		*/
		public static boolean isDeclared(@NonNull String name) {
		try {
		return getIServiceManager().isDeclared(name);
		} catch (RemoteException e) {
		Log.e(TAG, "error in isDeclared", e);
		return false;
		}
		}

		/**
		* Returns the specified service from the service manager.
		*
		* If the service is not running, servicemanager will attempt to start it, and this function
		* will wait for it to be ready.
		*
		* @return {@code null} only if there are permission problems or fatal errors.
		*/
		public static native IBinder waitForService(@NonNull String name);

		/**
		* Returns the specified service from the service manager, if declared.
		*
		* If the service is not running, servicemanager will attempt to start it, and this function
		* will wait for it to be ready.
		*
		* @return {@code null} if the service is not declared in the manifest, or if there are
		* permission problems, or if there are fatal errors.
		*/
		public static IBinder waitForDeclaredService(@NonNull String name) {
		return isDeclared(name) ? waitForService(name) : null;
		}

		/**
		* Return a list of all currently running services.
		* @return an array of all currently running services, or <code>null</code> in

core/java/android/os/ServiceManagerNative.java

+1 −1

Original line number	Diff line number	Diff line
		@@ -87,7 +87,7 @@ class ServiceManagerProxy implements IServiceManager {
		}

		public boolean isDeclared(String name) throws RemoteException {
		throw new RemoteException();
		return mServiceManager.isDeclared(name);
		}

		public void registerClientCallback(String name, IBinder service, IClientCallback cb)

core/jni/Android.bp

+1 −0

Original line number	Diff line number	Diff line
		@@ -123,6 +123,7 @@ cc_library_shared {
		"android_os_MessageQueue.cpp",
		"android_os_Parcel.cpp",
		"android_os_SELinux.cpp",
		"android_os_ServiceManager.cpp",
		"android_os_SharedMemory.cpp",
		"android_os_storage_StorageManager.cpp",
		"android_os_UEventObserver.cpp",

core/jni/AndroidRuntime.cpp

+2 −0

Original line number	Diff line number	Diff line
		@@ -136,6 +136,7 @@ extern int register_android_os_HwBlob(JNIEnv *env);
		extern int register_android_os_HwParcel(JNIEnv *env);
		extern int register_android_os_HwRemoteBinder(JNIEnv *env);
		extern int register_android_os_NativeHandle(JNIEnv *env);
		extern int register_android_os_ServiceManager(JNIEnv *env);
		extern int register_android_os_MessageQueue(JNIEnv* env);
		extern int register_android_os_Parcel(JNIEnv* env);
		extern int register_android_os_SELinux(JNIEnv* env);
		@@ -1461,6 +1462,7 @@ static const RegJNIRec gRegJNI[] = {
		REG_JNI(register_android_os_HwParcel),
		REG_JNI(register_android_os_HwRemoteBinder),
		REG_JNI(register_android_os_NativeHandle),
		REG_JNI(register_android_os_ServiceManager),
		REG_JNI(register_android_os_storage_StorageManager),
		REG_JNI(register_android_os_VintfObject),
		REG_JNI(register_android_os_VintfRuntimeInfo),

core/jni/android_os_ServiceManager.cpp

0 → 100644

+71 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2020 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		#define LOG_TAG "ServiceManager"
		//#define LOG_NDEBUG 0
		#include <android-base/logging.h>

		#include <binder/IInterface.h>
		#include <binder/IServiceManager.h>
		#include <nativehelper/JNIHelp.h>

		#include "android_util_Binder.h"
		#include "core_jni_helpers.h"

		namespace android {

		// Native because we have a client-side wait in waitForService() and we do not
		// want an unnecessary second copy of it.
		static jobject android_os_ServiceManager_waitForService(
		JNIEnv *env,
		jclass /* clazzObj */,
		jstring serviceNameObj) {

		const jchar* serviceName = env->GetStringCritical(serviceNameObj, nullptr);
		if (!serviceName) {
		jniThrowNullPointerException(env, nullptr);
		return nullptr;
		}
		String16 nameCopy = String16(reinterpret_cast<const char16_t *>(serviceName),
		env->GetStringLength(serviceNameObj));
		env->ReleaseStringCritical(serviceNameObj, serviceName);

		sp<IBinder> service = defaultServiceManager()->waitForService(nameCopy);

		if (!service) {
		return nullptr;
		}

		return javaObjectForIBinder(env, service);
		}

		// ----------------------------------------------------------------------------

		static const JNINativeMethod method_table[] = {
		/* name, signature, funcPtr */
		{
		"waitForService",
		"(Ljava/lang/String;)Landroid/os/IBinder;",
		(void*)android_os_ServiceManager_waitForService
		},
		};

		int register_android_os_ServiceManager(JNIEnv* env) {
		return RegisterMethodsOrDie(
		env, "android/os/ServiceManager", method_table, NELEM(method_table));
		}

		}; // namespace android