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Android framework服务命令行工具框架 - Android13
Android framework服务命令行工具框架 - Android13
1、framework服务命令行工具简介
这里强调 “framework服务” ，主要就是bin命令模拟 framework服务 相关的查询和功能，如am\pm\input等；其实质就是
Android 提供了大多数常见的 Unix 命令行工具，说白了就是bin执行程序。而 framework服务 命令行工具现在一般就是cmdbin执行程序Binder获取对应服务，通过IBinder::shellCommand调用对应服务的onShellCommand。
2、cmd 执行程序
2.1 目录和Android.bp
frameworks/native/cmds/cmd/Android.bp
frameworks/native/cmds/cmd/cmd.cpp
2.2 cmdMain 执行入口
DEBUG：默认关闭#define DEBUG 0serviceName：SM中注册的binder服务对应的名称，如ACTIVITY_SERVICE = "activity"（ActivityManagerService）IBinder::shellCommand(service, in, out, err, args, cb, result)：执行到对应服务onShellCommand
frameworks/native/cmds/cmd/cmd.cpp
int cmdMain(const std::vector<std::string_view>& argv, TextOutput& outputLog, TextOutput& errorLog, int in, int out, int err, RunMode runMode) { sp<ProcessState> proc = ProcessState::self(); proc->startThreadPool(); #if DEBUG ALOGD("cmd: starting"); #endif sp<IServiceManager> sm = defaultServiceManager(); if (runMode == RunMode::kStandalone) { fflush(stdout); } if (sm == nullptr) { ALOGW("Unable to get default service manager!"); errorLog << "cmd: Unable to get default service manager!" << endl; return 20; } int argc = argv.size(); if (argc == 0) { errorLog << "cmd: No service specified; use -l to list all running services. Use -w to start and wait for a service." << endl; return 20; } if ((argc == 1) && (argv[0] == "-l")) { Vector<String16> services = sm->listServices(); services.sort(sort_func); outputLog << "Currently running services:" << endl; for (size_t i=0; i<services.size(); i++) { sp<IBinder> service = sm->checkService(services[i]); if (service != nullptr) { outputLog << " " << services[i] << endl; } } return 0; } bool waitForService = ((argc > 1) && (argv[0] == "-w")); int serviceIdx = (waitForService) ? 1 : 0; const auto cmd = argv[serviceIdx]; Vector<String16> args; String16 serviceName = String16(cmd.data(), cmd.size()); for (int i = serviceIdx + 1; i < argc; i++) { args.add(String16(argv[i].data(), argv[i].size())); } sp<IBinder> service; if(waitForService) { service = sm->waitForService(serviceName); } else { service = sm->checkService(serviceName); } if (service == nullptr) { if (runMode == RunMode::kStandalone) { ALOGW("Can't find service %.*s", static_cast<int>(cmd.size()), cmd.data()); } errorLog << "cmd: Can't find service: " << cmd << endl; return 20; } sp<MyShellCallback> cb = new MyShellCallback(errorLog); sp<MyResultReceiver> result = new MyResultReceiver(); #if DEBUG ALOGD("cmd: Invoking %.*s in=%d, out=%d, err=%d", static_cast<int>(cmd.size()), cmd.data(), in, out, err); #endif // TODO: block until a result is returned to MyResultReceiver. status_t error = IBinder::shellCommand(service, in, out, err, args, cb, result); if (error < 0) { const char* errstr; switch (error) { case BAD_TYPE: errstr = "Bad type"; break; case FAILED_TRANSACTION: errstr = "Failed transaction"; break; case FDS_NOT_ALLOWED: errstr = "File descriptors not allowed"; break; case UNEXPECTED_NULL: errstr = "Unexpected null"; break; default: errstr = strerror(-error); break; } if (runMode == RunMode::kStandalone) { ALOGW("Failure calling service %.*s: %s (%d)", static_cast<int>(cmd.size()), cmd.data(), errstr, -error); } outputLog << "cmd: Failure calling service " << cmd << ": " << errstr << " (" << (-error) << ")" << endl; return error; } cb->mActive = false; status_t res = result->waitForResult(); #if DEBUG ALOGD("result=%d", (int)res); #endif return res; }- 1
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2.3 cmd命令
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cmd
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cmd -l列出SM中注册的服务
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cmd activity
3、am命令工具，实质脚本执行cmd activity
3.1 sh脚本
这里am工具为例。Android 提供了大多数常见的 Unix 命令行工具，查看可用工具的列表：
adb shell ls /system/binframeworks/base/cmds/am/am
#!/system/bin/sh if [ "$1" != "instrument" ] ; then cmd activity "$@" else base=/system export CLASSPATH=$base/framework/am.jar exec app_process $base/bin com.android.commands.am.Am "$@" fi- 1
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3.2 activity服务注册
activity服务就是ActivityManagerService注册的Context.ACTIVITY_SERVICEframeworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
public void setSystemProcess() { try { ServiceManager.addService(Context.ACTIVITY_SERVICE, this, /* allowIsolated= */ true, DUMP_FLAG_PRIORITY_CRITICAL | DUMP_FLAG_PRIORITY_NORMAL | DUMP_FLAG_PROTO); ServiceManager.addService(ProcessStats.SERVICE_NAME, mProcessStats); ServiceManager.addService("meminfo", new MemBinder(this), /* allowIsolated= */ false, DUMP_FLAG_PRIORITY_HIGH); ServiceManager.addService("gfxinfo", new GraphicsBinder(this)); ServiceManager.addService("dbinfo", new DbBinder(this)); mAppProfiler.setCpuInfoService(); ServiceManager.addService("permission", new PermissionController(this)); ServiceManager.addService("processinfo", new ProcessInfoService(this)); ServiceManager.addService("cacheinfo", new CacheBinder(this)); //... ... ... ... }- 1
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3.3 onShellCommand执行
ActivityManagerShellCommand专门处理am相关命令，这里具体功能不展开细说。frameworks/base/services/core/java/com/android/server/am/ActivityManagerService.java
@Override public void onShellCommand(FileDescriptor in, FileDescriptor out, FileDescriptor err, String[] args, ShellCallback callback, ResultReceiver resultReceiver) { (new ActivityManagerShellCommand(this, false)).exec( this, in, out, err, args, callback, resultReceiver); }- 1
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frameworks/base/services/core/java/com/android/server/am/ActivityManagerShellCommand.java
@Override public int onCommand(String cmd) { if (cmd == null) { return handleDefaultCommands(cmd); } final PrintWriter pw = getOutPrintWriter(); try { switch (cmd) { case "start": case "start-activity": return runStartActivity(pw); case "startservice": case "start-service": return runStartService(pw, false); case "startforegroundservice": case "startfgservice": case "start-foreground-service": case "start-fg-service": return runStartService(pw, true); case "stopservice": case "stop-service": return runStopService(pw); case "broadcast": return runSendBroadcast(pw); case "compact": return runCompact(pw); case "instrument": getOutPrintWriter().println("Error: must be invoked through 'am instrument'."); return -1; case "trace-ipc": return runTraceIpc(pw); case "profile": return runProfile(pw); case "dumpheap": return runDumpHeap(pw); case "set-debug-app": return runSetDebugApp(pw); case "set-agent-app": return runSetAgentApp(pw); case "clear-debug-app": return runClearDebugApp(pw); case "set-watch-heap": return runSetWatchHeap(pw); case "clear-watch-heap": return runClearWatchHeap(pw); case "clear-exit-info": return runClearExitInfo(pw); case "bug-report": return runBugReport(pw); case "force-stop": return runForceStop(pw); case "stop-app": return runStopApp(pw); case "fgs-notification-rate-limit": return runFgsNotificationRateLimit(pw); case "crash": return runCrash(pw); case "kill": return runKill(pw); case "kill-all": return runKillAll(pw); case "make-uid-idle": return runMakeIdle(pw); case "monitor": return runMonitor(pw); case "watch-uids": return runWatchUids(pw); case "hang": return runHang(pw); case "restart": return runRestart(pw); case "idle-maintenance": return runIdleMaintenance(pw); case "screen-compat": return runScreenCompat(pw); case "package-importance": return runPackageImportance(pw); case "to-uri": return runToUri(pw, 0); case "to-intent-uri": return runToUri(pw, Intent.URI_INTENT_SCHEME); case "to-app-uri": return runToUri(pw, Intent.URI_ANDROID_APP_SCHEME); case "switch-user": return runSwitchUser(pw); case "get-current-user": return runGetCurrentUser(pw); case "start-user": return runStartUser(pw); case "unlock-user": return runUnlockUser(pw); case "stop-user": return runStopUser(pw); case "is-user-stopped": return runIsUserStopped(pw); case "get-started-user-state": return runGetStartedUserState(pw); case "track-associations": return runTrackAssociations(pw); case "untrack-associations": return runUntrackAssociations(pw); case "get-uid-state": return getUidState(pw); case "get-config": return runGetConfig(pw); case "suppress-resize-config-changes": return runSuppressResizeConfigChanges(pw); case "set-inactive": return runSetInactive(pw); case "get-inactive": return runGetInactive(pw); case "set-standby-bucket": return runSetStandbyBucket(pw); case "get-standby-bucket": return runGetStandbyBucket(pw); case "send-trim-memory": return runSendTrimMemory(pw); case "display": return runDisplay(pw); case "stack": return runStack(pw); case "task": return runTask(pw); case "write": return runWrite(pw); case "attach-agent": return runAttachAgent(pw); case "supports-multiwindow": return runSupportsMultiwindow(pw); case "supports-split-screen-multi-window": return runSupportsSplitScreenMultiwindow(pw); case "update-appinfo": return runUpdateApplicationInfo(pw); case "no-home-screen": return runNoHomeScreen(pw); case "wait-for-broadcast-idle": return runWaitForBroadcastIdle(pw); case "compat": return runCompat(pw); case "refresh-settings-cache": return runRefreshSettingsCache(); case "memory-factor": return runMemoryFactor(pw); case "service-restart-backoff": return runServiceRestartBackoff(pw); case "get-isolated-pids": return runGetIsolatedProcesses(pw); case "set-stop-user-on-switch": return runSetStopUserOnSwitch(pw); case "set-bg-abusive-uids": return runSetBgAbusiveUids(pw); case "list-bg-exemptions-config": return runListBgExemptionsConfig(pw); default: return handleDefaultCommands(cmd); } } catch (RemoteException e) { pw.println("Remote exception: " + e); } return -1; }- 1
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4、简易时序图
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- 原文地址：https://blog.csdn.net/qq_23452385/article/details/134087671
