ServiceManagement -> HidlServiceManagement
To make logs more clear.
Bug: N/A
Test: N/A
Change-Id: Ib91b6eaad4f2958127c9a0aa7097736f35fbc1a3
diff --git a/transport/HidlServiceManagement.cpp b/transport/HidlServiceManagement.cpp
new file mode 100644
index 0000000..357bb30
--- /dev/null
+++ b/transport/HidlServiceManagement.cpp
@@ -0,0 +1,865 @@
+/*
+ * Copyright (C) 2016 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 "HidlServiceManagement"
+
+#include <android/dlext.h>
+#include <condition_variable>
+#include <dlfcn.h>
+#include <dirent.h>
+#include <fstream>
+#include <pthread.h>
+#include <unistd.h>
+
+#include <mutex>
+#include <regex>
+#include <set>
+
+#include <hidl/HidlBinderSupport.h>
+#include <hidl/HidlInternal.h>
+#include <hidl/HidlTransportUtils.h>
+#include <hidl/ServiceManagement.h>
+#include <hidl/Status.h>
+#include <utils/SystemClock.h>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <android-base/parseint.h>
+#include <android-base/properties.h>
+#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
+#include <hwbinder/IPCThreadState.h>
+#include <hwbinder/Parcel.h>
+#if !defined(__ANDROID_RECOVERY__)
+#include <vndksupport/linker.h>
+#endif
+
+#include <android/hidl/manager/1.2/BnHwServiceManager.h>
+#include <android/hidl/manager/1.2/BpHwServiceManager.h>
+#include <android/hidl/manager/1.2/IServiceManager.h>
+
+#define RE_COMPONENT "[a-zA-Z_][a-zA-Z_0-9]*"
+#define RE_PATH RE_COMPONENT "(?:[.]" RE_COMPONENT ")*"
+static const std::regex gLibraryFileNamePattern("(" RE_PATH "@[0-9]+[.][0-9]+)-impl(.*?).so");
+
+using android::base::WaitForProperty;
+
+using ::android::hidl::base::V1_0::IBase;
+using IServiceManager1_0 = android::hidl::manager::V1_0::IServiceManager;
+using IServiceManager1_1 = android::hidl::manager::V1_1::IServiceManager;
+using IServiceManager1_2 = android::hidl::manager::V1_2::IServiceManager;
+using ::android::hidl::manager::V1_0::IServiceNotification;
+
+namespace android {
+namespace hardware {
+
+static const char* kHwServicemanagerReadyProperty = "hwservicemanager.ready";
+
+#if defined(__ANDROID_RECOVERY__)
+static constexpr bool kIsRecovery = true;
+#else
+static constexpr bool kIsRecovery = false;
+#endif
+
+static void waitForHwServiceManager() {
+ using std::literals::chrono_literals::operator""s;
+
+ while (!WaitForProperty(kHwServicemanagerReadyProperty, "true", 1s)) {
+ LOG(WARNING) << "Waited for hwservicemanager.ready for a second, waiting another...";
+ }
+}
+
+static std::string binaryName() {
+ std::ifstream ifs("/proc/self/cmdline");
+ std::string cmdline;
+ if (!ifs.is_open()) {
+ return "";
+ }
+ ifs >> cmdline;
+
+ size_t idx = cmdline.rfind('/');
+ if (idx != std::string::npos) {
+ cmdline = cmdline.substr(idx + 1);
+ }
+
+ return cmdline;
+}
+
+static std::string packageWithoutVersion(const std::string& packageAndVersion) {
+ size_t at = packageAndVersion.find('@');
+ if (at == std::string::npos) return packageAndVersion;
+ return packageAndVersion.substr(0, at);
+}
+
+static void tryShortenProcessName(const std::string& descriptor) {
+ const static std::string kTasks = "/proc/self/task/";
+
+ // make sure that this binary name is in the same package
+ std::string processName = binaryName();
+
+ // e.x. android.hardware.foo is this package
+ if (!base::StartsWith(packageWithoutVersion(processName), packageWithoutVersion(descriptor))) {
+ return;
+ }
+
+ // e.x. android.hardware.module.foo@1.2::IFoo -> foo@1.2
+ size_t lastDot = descriptor.rfind('.');
+ if (lastDot == std::string::npos) return;
+ size_t secondDot = descriptor.rfind('.', lastDot - 1);
+ if (secondDot == std::string::npos) return;
+
+ std::string newName = processName.substr(secondDot + 1, std::string::npos);
+ ALOGI("Removing namespace from process name %s to %s.", processName.c_str(), newName.c_str());
+
+ std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(kTasks.c_str()), closedir);
+ if (dir == nullptr) return;
+
+ dirent* dp;
+ while ((dp = readdir(dir.get())) != nullptr) {
+ if (dp->d_type != DT_DIR) continue;
+ if (dp->d_name[0] == '.') continue;
+
+ std::fstream fs(kTasks + dp->d_name + "/comm");
+ if (!fs.is_open()) {
+ ALOGI("Could not rename process, failed read comm for %s.", dp->d_name);
+ continue;
+ }
+
+ std::string oldComm;
+ fs >> oldComm;
+
+ // don't rename if it already has an explicit name
+ if (base::StartsWith(descriptor, oldComm)) {
+ fs.seekg(0, fs.beg);
+ fs << newName;
+ }
+ }
+}
+
+namespace details {
+
+/*
+ * Returns the age of the current process by reading /proc/self/stat and comparing starttime to the
+ * current time. This is useful for measuring how long it took a HAL to register itself.
+ */
+static long getProcessAgeMs() {
+ constexpr const int PROCFS_STAT_STARTTIME_INDEX = 21;
+ std::string content;
+ android::base::ReadFileToString("/proc/self/stat", &content, false);
+ auto stats = android::base::Split(content, " ");
+ if (stats.size() <= PROCFS_STAT_STARTTIME_INDEX) {
+ LOG(INFO) << "Could not read starttime from /proc/self/stat";
+ return -1;
+ }
+ const std::string& startTimeString = stats[PROCFS_STAT_STARTTIME_INDEX];
+ static const int64_t ticksPerSecond = sysconf(_SC_CLK_TCK);
+ const int64_t uptime = android::uptimeMillis();
+
+ unsigned long long startTimeInClockTicks = 0;
+ if (android::base::ParseUint(startTimeString, &startTimeInClockTicks)) {
+ long startTimeMs = 1000ULL * startTimeInClockTicks / ticksPerSecond;
+ return uptime - startTimeMs;
+ }
+ return -1;
+}
+
+static void onRegistrationImpl(const std::string& descriptor, const std::string& instanceName) {
+ long halStartDelay = getProcessAgeMs();
+ if (halStartDelay >= 0) {
+ // The "start delay" printed here is an estimate of how long it took the HAL to go from
+ // process creation to registering itself as a HAL. Actual start time could be longer
+ // because the process might not have joined the threadpool yet, so it might not be ready to
+ // process transactions.
+ LOG(INFO) << "Registered " << descriptor << "/" << instanceName << " (start delay of "
+ << halStartDelay << "ms)";
+ }
+
+ tryShortenProcessName(descriptor);
+}
+
+void onRegistration(const std::string& packageName, const std::string& interfaceName,
+ const std::string& instanceName) {
+ return onRegistrationImpl(packageName + "::" + interfaceName, instanceName);
+}
+
+} // details
+
+sp<IServiceManager1_0> defaultServiceManager() {
+ return defaultServiceManager1_2();
+}
+sp<IServiceManager1_1> defaultServiceManager1_1() {
+ return defaultServiceManager1_2();
+}
+sp<IServiceManager1_2> defaultServiceManager1_2() {
+ using android::hidl::manager::V1_2::BnHwServiceManager;
+ using android::hidl::manager::V1_2::BpHwServiceManager;
+
+ static std::mutex gDefaultServiceManagerLock;
+ static sp<IServiceManager1_2> gDefaultServiceManager;
+
+ {
+ std::lock_guard<std::mutex> _l(gDefaultServiceManagerLock);
+ if (gDefaultServiceManager != nullptr) {
+ return gDefaultServiceManager;
+ }
+
+ if (access("/dev/hwbinder", F_OK|R_OK|W_OK) != 0) {
+ // HwBinder not available on this device or not accessible to
+ // this process.
+ return nullptr;
+ }
+
+ waitForHwServiceManager();
+
+ while (gDefaultServiceManager == nullptr) {
+ gDefaultServiceManager =
+ fromBinder<IServiceManager1_2, BpHwServiceManager, BnHwServiceManager>(
+ ProcessState::self()->getContextObject(nullptr));
+ if (gDefaultServiceManager == nullptr) {
+ LOG(ERROR) << "Waited for hwservicemanager, but got nullptr.";
+ sleep(1);
+ }
+ }
+ }
+
+ return gDefaultServiceManager;
+}
+
+static std::vector<std::string> findFiles(const std::string& path, const std::string& prefix,
+ const std::string& suffix) {
+ std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(path.c_str()), closedir);
+ if (!dir) return {};
+
+ std::vector<std::string> results{};
+
+ dirent* dp;
+ while ((dp = readdir(dir.get())) != nullptr) {
+ std::string name = dp->d_name;
+
+ if (base::StartsWith(name, prefix) && base::EndsWith(name, suffix)) {
+ results.push_back(name);
+ }
+ }
+
+ return results;
+}
+
+bool matchPackageName(const std::string& lib, std::string* matchedName, std::string* implName) {
+ std::smatch match;
+ if (std::regex_match(lib, match, gLibraryFileNamePattern)) {
+ *matchedName = match.str(1) + "::I*";
+ *implName = match.str(2);
+ return true;
+ }
+ return false;
+}
+
+static void registerReference(const hidl_string &interfaceName, const hidl_string &instanceName) {
+ if (kIsRecovery) {
+ // No hwservicemanager in recovery.
+ return;
+ }
+
+ sp<IServiceManager1_0> binderizedManager = defaultServiceManager();
+ if (binderizedManager == nullptr) {
+ LOG(WARNING) << "Could not registerReference for "
+ << interfaceName << "/" << instanceName
+ << ": null binderized manager.";
+ return;
+ }
+ auto ret = binderizedManager->registerPassthroughClient(interfaceName, instanceName);
+ if (!ret.isOk()) {
+ LOG(WARNING) << "Could not registerReference for "
+ << interfaceName << "/" << instanceName
+ << ": " << ret.description();
+ return;
+ }
+ LOG(VERBOSE) << "Successfully registerReference for "
+ << interfaceName << "/" << instanceName;
+}
+
+using InstanceDebugInfo = hidl::manager::V1_0::IServiceManager::InstanceDebugInfo;
+static inline void fetchPidsForPassthroughLibraries(
+ std::map<std::string, InstanceDebugInfo>* infos) {
+ static const std::string proc = "/proc/";
+
+ std::map<std::string, std::set<pid_t>> pids;
+ std::unique_ptr<DIR, decltype(&closedir)> dir(opendir(proc.c_str()), closedir);
+ if (!dir) return;
+ dirent* dp;
+ while ((dp = readdir(dir.get())) != nullptr) {
+ pid_t pid = strtoll(dp->d_name, nullptr, 0);
+ if (pid == 0) continue;
+ std::string mapsPath = proc + dp->d_name + "/maps";
+ std::ifstream ifs{mapsPath};
+ if (!ifs.is_open()) continue;
+
+ for (std::string line; std::getline(ifs, line);) {
+ // The last token of line should look like
+ // vendor/lib64/hw/android.hardware.foo@1.0-impl-extra.so
+ // Use some simple filters to ignore bad lines before extracting libFileName
+ // and checking the key in info to make parsing faster.
+ if (line.back() != 'o') continue;
+ if (line.rfind('@') == std::string::npos) continue;
+
+ auto spacePos = line.rfind(' ');
+ if (spacePos == std::string::npos) continue;
+ auto libFileName = line.substr(spacePos + 1);
+ auto it = infos->find(libFileName);
+ if (it == infos->end()) continue;
+ pids[libFileName].insert(pid);
+ }
+ }
+ for (auto& pair : *infos) {
+ pair.second.clientPids =
+ std::vector<pid_t>{pids[pair.first].begin(), pids[pair.first].end()};
+ }
+}
+
+struct PassthroughServiceManager : IServiceManager1_1 {
+ static void openLibs(
+ const std::string& fqName,
+ const std::function<bool /* continue */ (void* /* handle */, const std::string& /* lib */,
+ const std::string& /* sym */)>& eachLib) {
+ //fqName looks like android.hardware.foo@1.0::IFoo
+ size_t idx = fqName.find("::");
+
+ if (idx == std::string::npos ||
+ idx + strlen("::") + 1 >= fqName.size()) {
+ LOG(ERROR) << "Invalid interface name passthrough lookup: " << fqName;
+ return;
+ }
+
+ std::string packageAndVersion = fqName.substr(0, idx);
+ std::string ifaceName = fqName.substr(idx + strlen("::"));
+
+ const std::string prefix = packageAndVersion + "-impl";
+ const std::string sym = "HIDL_FETCH_" + ifaceName;
+
+ constexpr int dlMode = RTLD_LAZY;
+ void* handle = nullptr;
+
+ dlerror(); // clear
+
+ static std::string halLibPathVndkSp = android::base::StringPrintf(
+ HAL_LIBRARY_PATH_VNDK_SP_FOR_VERSION, details::getVndkVersionStr().c_str());
+ std::vector<std::string> paths = {
+ HAL_LIBRARY_PATH_ODM, HAL_LIBRARY_PATH_VENDOR, halLibPathVndkSp,
+#ifndef __ANDROID_VNDK__
+ HAL_LIBRARY_PATH_SYSTEM,
+#endif
+ };
+
+#ifdef LIBHIDL_TARGET_DEBUGGABLE
+ const char* env = std::getenv("TREBLE_TESTING_OVERRIDE");
+ const bool trebleTestingOverride = env && !strcmp(env, "true");
+ if (trebleTestingOverride) {
+ // Load HAL implementations that are statically linked
+ handle = dlopen(nullptr, dlMode);
+ if (handle == nullptr) {
+ const char* error = dlerror();
+ LOG(ERROR) << "Failed to dlopen self: "
+ << (error == nullptr ? "unknown error" : error);
+ } else if (!eachLib(handle, "SELF", sym)) {
+ return;
+ }
+
+ const char* vtsRootPath = std::getenv("VTS_ROOT_PATH");
+ if (vtsRootPath && strlen(vtsRootPath) > 0) {
+ const std::string halLibraryPathVtsOverride =
+ std::string(vtsRootPath) + HAL_LIBRARY_PATH_SYSTEM;
+ paths.insert(paths.begin(), halLibraryPathVtsOverride);
+ }
+ }
+#endif
+
+ for (const std::string& path : paths) {
+ std::vector<std::string> libs = findFiles(path, prefix, ".so");
+
+ for (const std::string &lib : libs) {
+ const std::string fullPath = path + lib;
+
+ if (kIsRecovery || path == HAL_LIBRARY_PATH_SYSTEM) {
+ handle = dlopen(fullPath.c_str(), dlMode);
+ } else {
+#if !defined(__ANDROID_RECOVERY__)
+ handle = android_load_sphal_library(fullPath.c_str(), dlMode);
+#endif
+ }
+
+ if (handle == nullptr) {
+ const char* error = dlerror();
+ LOG(ERROR) << "Failed to dlopen " << lib << ": "
+ << (error == nullptr ? "unknown error" : error);
+ continue;
+ }
+
+ if (!eachLib(handle, lib, sym)) {
+ return;
+ }
+ }
+ }
+ }
+
+ Return<sp<IBase>> get(const hidl_string& fqName,
+ const hidl_string& name) override {
+ sp<IBase> ret = nullptr;
+
+ openLibs(fqName, [&](void* handle, const std::string &lib, const std::string &sym) {
+ IBase* (*generator)(const char* name);
+ *(void **)(&generator) = dlsym(handle, sym.c_str());
+ if(!generator) {
+ const char* error = dlerror();
+ LOG(ERROR) << "Passthrough lookup opened " << lib
+ << " but could not find symbol " << sym << ": "
+ << (error == nullptr ? "unknown error" : error);
+ dlclose(handle);
+ return true;
+ }
+
+ ret = (*generator)(name.c_str());
+
+ if (ret == nullptr) {
+ dlclose(handle);
+ return true; // this module doesn't provide this instance name
+ }
+
+ // Actual fqname might be a subclass.
+ // This assumption is tested in vts_treble_vintf_test
+ using ::android::hardware::details::getDescriptor;
+ std::string actualFqName = getDescriptor(ret.get());
+ CHECK(actualFqName.size() > 0);
+ registerReference(actualFqName, name);
+ return false;
+ });
+
+ return ret;
+ }
+
+ Return<bool> add(const hidl_string& /* name */,
+ const sp<IBase>& /* service */) override {
+ LOG(FATAL) << "Cannot register services with passthrough service manager.";
+ return false;
+ }
+
+ Return<Transport> getTransport(const hidl_string& /* fqName */,
+ const hidl_string& /* name */) {
+ LOG(FATAL) << "Cannot getTransport with passthrough service manager.";
+ return Transport::EMPTY;
+ }
+
+ Return<void> list(list_cb /* _hidl_cb */) override {
+ LOG(FATAL) << "Cannot list services with passthrough service manager.";
+ return Void();
+ }
+ Return<void> listByInterface(const hidl_string& /* fqInstanceName */,
+ listByInterface_cb /* _hidl_cb */) override {
+ // TODO: add this functionality
+ LOG(FATAL) << "Cannot list services with passthrough service manager.";
+ return Void();
+ }
+
+ Return<bool> registerForNotifications(const hidl_string& /* fqName */,
+ const hidl_string& /* name */,
+ const sp<IServiceNotification>& /* callback */) override {
+ // This makes no sense.
+ LOG(FATAL) << "Cannot register for notifications with passthrough service manager.";
+ return false;
+ }
+
+ Return<void> debugDump(debugDump_cb _hidl_cb) override {
+ using Arch = ::android::hidl::base::V1_0::DebugInfo::Architecture;
+ using std::literals::string_literals::operator""s;
+ static std::string halLibPathVndkSp64 = android::base::StringPrintf(
+ HAL_LIBRARY_PATH_VNDK_SP_64BIT_FOR_VERSION, details::getVndkVersionStr().c_str());
+ static std::string halLibPathVndkSp32 = android::base::StringPrintf(
+ HAL_LIBRARY_PATH_VNDK_SP_32BIT_FOR_VERSION, details::getVndkVersionStr().c_str());
+ static std::vector<std::pair<Arch, std::vector<const char*>>> sAllPaths{
+ {Arch::IS_64BIT,
+ {
+ HAL_LIBRARY_PATH_ODM_64BIT, HAL_LIBRARY_PATH_VENDOR_64BIT,
+ halLibPathVndkSp64.c_str(),
+#ifndef __ANDROID_VNDK__
+ HAL_LIBRARY_PATH_SYSTEM_64BIT,
+#endif
+ }},
+ {Arch::IS_32BIT,
+ {
+ HAL_LIBRARY_PATH_ODM_32BIT, HAL_LIBRARY_PATH_VENDOR_32BIT,
+ halLibPathVndkSp32.c_str(),
+#ifndef __ANDROID_VNDK__
+ HAL_LIBRARY_PATH_SYSTEM_32BIT,
+#endif
+ }}};
+ std::map<std::string, InstanceDebugInfo> map;
+ for (const auto &pair : sAllPaths) {
+ Arch arch = pair.first;
+ for (const auto &path : pair.second) {
+ std::vector<std::string> libs = findFiles(path, "", ".so");
+ for (const std::string &lib : libs) {
+ std::string matchedName;
+ std::string implName;
+ if (matchPackageName(lib, &matchedName, &implName)) {
+ std::string instanceName{"* ("s + path + ")"s};
+ if (!implName.empty()) instanceName += " ("s + implName + ")"s;
+ map.emplace(path + lib, InstanceDebugInfo{.interfaceName = matchedName,
+ .instanceName = instanceName,
+ .clientPids = {},
+ .arch = arch});
+ }
+ }
+ }
+ }
+ fetchPidsForPassthroughLibraries(&map);
+ hidl_vec<InstanceDebugInfo> vec;
+ vec.resize(map.size());
+ size_t idx = 0;
+ for (auto&& pair : map) {
+ vec[idx++] = std::move(pair.second);
+ }
+ _hidl_cb(vec);
+ return Void();
+ }
+
+ Return<void> registerPassthroughClient(const hidl_string &, const hidl_string &) override {
+ // This makes no sense.
+ LOG(FATAL) << "Cannot call registerPassthroughClient on passthrough service manager. "
+ << "Call it on defaultServiceManager() instead.";
+ return Void();
+ }
+
+ Return<bool> unregisterForNotifications(const hidl_string& /* fqName */,
+ const hidl_string& /* name */,
+ const sp<IServiceNotification>& /* callback */) override {
+ // This makes no sense.
+ LOG(FATAL) << "Cannot unregister for notifications with passthrough service manager.";
+ return false;
+ }
+
+};
+
+sp<IServiceManager1_0> getPassthroughServiceManager() {
+ return getPassthroughServiceManager1_1();
+}
+sp<IServiceManager1_1> getPassthroughServiceManager1_1() {
+ static sp<PassthroughServiceManager> manager(new PassthroughServiceManager());
+ return manager;
+}
+
+namespace details {
+
+void preloadPassthroughService(const std::string &descriptor) {
+ PassthroughServiceManager::openLibs(descriptor,
+ [&](void* /* handle */, const std::string& /* lib */, const std::string& /* sym */) {
+ // do nothing
+ return true; // open all libs
+ });
+}
+
+struct Waiter : IServiceNotification {
+ Waiter(const std::string& interface, const std::string& instanceName,
+ const sp<IServiceManager1_1>& sm) : mInterfaceName(interface),
+ mInstanceName(instanceName), mSm(sm) {
+ }
+
+ void onFirstRef() override {
+ // If this process only has one binder thread, and we're calling wait() from
+ // that thread, it will block forever because we hung up the one and only
+ // binder thread on a condition variable that can only be notified by an
+ // incoming binder call.
+ if (IPCThreadState::self()->isOnlyBinderThread()) {
+ LOG(WARNING) << "Can't efficiently wait for " << mInterfaceName << "/"
+ << mInstanceName << ", because we are called from "
+ << "the only binder thread in this process.";
+ return;
+ }
+
+ Return<bool> ret = mSm->registerForNotifications(mInterfaceName, mInstanceName, this);
+
+ if (!ret.isOk()) {
+ LOG(ERROR) << "Transport error, " << ret.description()
+ << ", during notification registration for " << mInterfaceName << "/"
+ << mInstanceName << ".";
+ return;
+ }
+
+ if (!ret) {
+ LOG(ERROR) << "Could not register for notifications for " << mInterfaceName << "/"
+ << mInstanceName << ".";
+ return;
+ }
+
+ mRegisteredForNotifications = true;
+ }
+
+ ~Waiter() {
+ if (!mDoneCalled) {
+ LOG(FATAL)
+ << "Waiter still registered for notifications, call done() before dropping ref!";
+ }
+ }
+
+ Return<void> onRegistration(const hidl_string& /* fqName */,
+ const hidl_string& /* name */,
+ bool /* preexisting */) override {
+ std::unique_lock<std::mutex> lock(mMutex);
+ if (mRegistered) {
+ return Void();
+ }
+ mRegistered = true;
+ lock.unlock();
+
+ mCondition.notify_one();
+ return Void();
+ }
+
+ void wait(bool timeout) {
+ using std::literals::chrono_literals::operator""s;
+
+ if (!mRegisteredForNotifications) {
+ // As an alternative, just sleep for a second and return
+ LOG(WARNING) << "Waiting one second for " << mInterfaceName << "/" << mInstanceName;
+ sleep(1);
+ return;
+ }
+
+ std::unique_lock<std::mutex> lock(mMutex);
+ do {
+ mCondition.wait_for(lock, 1s, [this]{
+ return mRegistered;
+ });
+
+ if (mRegistered) {
+ break;
+ }
+
+ LOG(WARNING) << "Waited one second for " << mInterfaceName << "/" << mInstanceName;
+ } while (!timeout);
+ }
+
+ // Be careful when using this; after calling reset(), you must always try to retrieve
+ // the corresponding service before blocking on the waiter; otherwise, you might run
+ // into a race-condition where the service has just (re-)registered, you clear the state
+ // here, and subsequently calling waiter->wait() will block forever.
+ void reset() {
+ std::unique_lock<std::mutex> lock(mMutex);
+ mRegistered = false;
+ }
+
+ // done() must be called before dropping the last strong ref to the Waiter, to make
+ // sure we can properly unregister with hwservicemanager.
+ void done() {
+ if (mRegisteredForNotifications) {
+ if (!mSm->unregisterForNotifications(mInterfaceName, mInstanceName, this)
+ .withDefault(false)) {
+ LOG(ERROR) << "Could not unregister service notification for " << mInterfaceName
+ << "/" << mInstanceName << ".";
+ } else {
+ mRegisteredForNotifications = false;
+ }
+ }
+ mDoneCalled = true;
+ }
+
+ private:
+ const std::string mInterfaceName;
+ const std::string mInstanceName;
+ sp<IServiceManager1_1> mSm;
+ std::mutex mMutex;
+ std::condition_variable mCondition;
+ bool mRegistered = false;
+ bool mRegisteredForNotifications = false;
+ bool mDoneCalled = false;
+};
+
+void waitForHwService(
+ const std::string &interface, const std::string &instanceName) {
+ sp<Waiter> waiter = new Waiter(interface, instanceName, defaultServiceManager1_1());
+ waiter->wait(false /* timeout */);
+ waiter->done();
+}
+
+// Prints relevant error/warning messages for error return values from
+// details::canCastInterface(), both transaction errors (!castReturn.isOk())
+// as well as actual cast failures (castReturn.isOk() && castReturn = false).
+// Returns 'true' if the error is non-fatal and it's useful to retry
+bool handleCastError(const Return<bool>& castReturn, const std::string& descriptor,
+ const std::string& instance) {
+ if (castReturn.isOk()) {
+ if (castReturn) {
+ details::logAlwaysFatal("Successful cast value passed into handleCastError.");
+ }
+ // This should never happen, and there's not really a point in retrying.
+ ALOGE("getService: received incompatible service (bug in hwservicemanager?) for "
+ "%s/%s.", descriptor.c_str(), instance.c_str());
+ return false;
+ }
+ if (castReturn.isDeadObject()) {
+ ALOGW("getService: found dead hwbinder service for %s/%s.", descriptor.c_str(),
+ instance.c_str());
+ return true;
+ }
+ // This can happen due to:
+ // 1) No SELinux permissions
+ // 2) Other transaction failure (no buffer space, kernel error)
+ // The first isn't recoverable, but the second is.
+ // Since we can't yet differentiate between the two, and clients depend
+ // on us not blocking in case 1), treat this as a fatal error for now.
+ ALOGW("getService: unable to call into hwbinder service for %s/%s.",
+ descriptor.c_str(), instance.c_str());
+ return false;
+}
+
+sp<::android::hidl::base::V1_0::IBase> getRawServiceInternal(const std::string& descriptor,
+ const std::string& instance,
+ bool retry, bool getStub) {
+ using Transport = ::android::hidl::manager::V1_0::IServiceManager::Transport;
+ using ::android::hidl::manager::V1_0::IServiceManager;
+ sp<Waiter> waiter;
+
+ sp<IServiceManager1_1> sm;
+ Transport transport = Transport::EMPTY;
+ if (kIsRecovery) {
+ transport = Transport::PASSTHROUGH;
+ } else {
+ sm = defaultServiceManager1_1();
+ if (sm == nullptr) {
+ ALOGE("getService: defaultServiceManager() is null");
+ return nullptr;
+ }
+
+ Return<Transport> transportRet = sm->getTransport(descriptor, instance);
+
+ if (!transportRet.isOk()) {
+ ALOGE("getService: defaultServiceManager()->getTransport returns %s",
+ transportRet.description().c_str());
+ return nullptr;
+ }
+ transport = transportRet;
+ }
+
+ const bool vintfHwbinder = (transport == Transport::HWBINDER);
+ const bool vintfPassthru = (transport == Transport::PASSTHROUGH);
+
+#ifdef ENFORCE_VINTF_MANIFEST
+
+#ifdef LIBHIDL_TARGET_DEBUGGABLE
+ const char* env = std::getenv("TREBLE_TESTING_OVERRIDE");
+ const bool trebleTestingOverride = env && !strcmp(env, "true");
+ const bool vintfLegacy = (transport == Transport::EMPTY) && trebleTestingOverride;
+#else // ENFORCE_VINTF_MANIFEST but not LIBHIDL_TARGET_DEBUGGABLE
+ const bool trebleTestingOverride = false;
+ const bool vintfLegacy = false;
+#endif // LIBHIDL_TARGET_DEBUGGABLE
+
+#else // not ENFORCE_VINTF_MANIFEST
+ const char* env = std::getenv("TREBLE_TESTING_OVERRIDE");
+ const bool trebleTestingOverride = env && !strcmp(env, "true");
+ const bool vintfLegacy = (transport == Transport::EMPTY);
+
+ ALOGE("getService: Potential race detected. The VINTF manifest is not being enforced. If a HAL "
+ "server has a delay in starting and it is not in the manifest, it will not be retrieved. "
+ "Please make sure all HALs on this device are in the VINTF manifest and enable "
+ "PRODUCT_ENFORCE_VINTF_MANIFEST on this device (this is also enabled by "
+ "PRODUCT_FULL_TREBLE). PRODUCT_ENFORCE_VINTF_MANIFEST will ensure that no race condition "
+ "is possible here.");
+#endif // ENFORCE_VINTF_MANIFEST
+
+ for (int tries = 0; !getStub && (vintfHwbinder || vintfLegacy); tries++) {
+ if (waiter == nullptr && tries > 0) {
+ waiter = new Waiter(descriptor, instance, sm);
+ }
+ if (waiter != nullptr) {
+ waiter->reset(); // don't reorder this -- see comments on reset()
+ }
+ Return<sp<IBase>> ret = sm->get(descriptor, instance);
+ if (!ret.isOk()) {
+ ALOGE("getService: defaultServiceManager()->get returns %s for %s/%s.",
+ ret.description().c_str(), descriptor.c_str(), instance.c_str());
+ break;
+ }
+ sp<IBase> base = ret;
+ if (base != nullptr) {
+ Return<bool> canCastRet =
+ details::canCastInterface(base.get(), descriptor.c_str(), true /* emitError */);
+
+ if (canCastRet.isOk() && canCastRet) {
+ if (waiter != nullptr) {
+ waiter->done();
+ }
+ return base; // still needs to be wrapped by Bp class.
+ }
+
+ if (!handleCastError(canCastRet, descriptor, instance)) break;
+ }
+
+ // In case of legacy or we were not asked to retry, don't.
+ if (vintfLegacy || !retry) break;
+
+ if (waiter != nullptr) {
+ ALOGI("getService: Trying again for %s/%s...", descriptor.c_str(), instance.c_str());
+ waiter->wait(true /* timeout */);
+ }
+ }
+
+ if (waiter != nullptr) {
+ waiter->done();
+ }
+
+ if (getStub || vintfPassthru || vintfLegacy) {
+ const sp<IServiceManager> pm = getPassthroughServiceManager();
+ if (pm != nullptr) {
+ sp<IBase> base = pm->get(descriptor, instance).withDefault(nullptr);
+ if (!getStub || trebleTestingOverride) {
+ base = wrapPassthrough(base);
+ }
+ return base;
+ }
+ }
+
+ return nullptr;
+}
+
+status_t registerAsServiceInternal(const sp<IBase>& service, const std::string& name) {
+ if (service == nullptr) {
+ return UNEXPECTED_NULL;
+ }
+
+ sp<IServiceManager1_2> sm = defaultServiceManager1_2();
+ if (sm == nullptr) {
+ return INVALID_OPERATION;
+ }
+
+ bool registered = false;
+ Return<void> ret = service->interfaceChain([&](const auto& chain) {
+ registered = sm->addWithChain(name.c_str(), service, chain).withDefault(false);
+ });
+
+ if (!ret.isOk()) {
+ LOG(ERROR) << "Could not retrieve interface chain: " << ret.description();
+ }
+
+ if (registered) {
+ onRegistrationImpl(getDescriptor(service.get()), name);
+ }
+
+ return registered ? OK : UNKNOWN_ERROR;
+}
+
+} // namespace details
+
+} // namespace hardware
+} // namespace android