本文主要是介绍dumpsys相关解析，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
（1）命令使用
dumpsys命令功能很强大，能dump系统服务的各种状态，这里以AMS为例子，它在ServiceManager中的名字为activity，所以使用dumpsys activity便可，同理，其他service的dump方法也是一样的。
常用的一些命令如下：
//dumpsys activity：查询AMS服务相关信息，相当于 ActivityManagerService.dump()
dumpsys activity intents：查询系统所有待处理intent信息；
dumpsys activity broadcasts：可查询所有注册广播接收者、前台广播、后台广播信息；
dumpsys activity providers：查询系统组件provider相关信息；
dumpsys activity activitys：查询系统组件activity相关信息；
dumpsys activity services：查询系统组件service相关信息；
dumpsys activity top | grep ACTIVITY：查询当前界面显示的top Activity；//dumpsys window：查询WMS服务相关信息
dumpsys window：可获取当前界面所在的应用，可看到获取焦点的window和应用；//dumpsys cpuinfo：查询CPU情况
dumpsys cpuinfo：获取当前cpu使用情况，也可已使用top命令；//dumpsys meminfo：查询内存情况
dumpsys meminfo + 包名：查看应用内存占用信息；
dumpsys meminfo --oom：查看应用内存层级；//dumpsys package：查询PMS相关信息
dumpsys package + 包名：查看应用相关信息；
dumpsys package + 包名 |grep version：查看应用的版本信息；
dumpsys package + 包名 |grep apk：查看应用安装路径信息；//dumpsys gfxinfo：查询图像相关信息
dumpsys gfxinfo+ 包名：查看应用的丢帧情况；
activity ActivityManagerService AMS相关信息
package PackageManagerService PMS相关信息
window WindowManagerService WMS相关信息
input InputManagerService IMS相关信息
power PowerManagerService PMS相关信息
batterystats BatterystatsService 电池统计信息
battery BatteryService 电池信息
alarm AlarmManagerService 闹钟信息
dropbox DropboxManagerService 调试相关
procstats ProcessStatsService 进程统计
cpuinfo CpuBinder CPU
meminfo MemBinder 内存
gfxinfo GraphicsBinder 图像
dbinfo DbBinder 数据库
可查询的服务有很多，可通过下面命令查看当前系统所支持的dump服务：
adb shell dumpsys -l
adb shell service list
（2）代码逻辑
如下目录是framework处理dumpsys命令的入口：
//frameworks/native/cmds/dumpsys/main.cppint main(int argc, char* const argv[]) {signal(SIGPIPE, SIG_IGN);sp<IServiceManager> sm = defaultServiceManager();fflush(stdout);if (sm == nullptr) {ALOGE("Unable to get default service manager!");std::cerr << "dumpsys: Unable to get default service manager!" << std::endl;return 20;}Dumpsys dumpsys(sm.get());return dumpsys.main(argc, argv);
}
如果ServiceManager还没起来，无法处理命令，所以需要判空，SM进程起来的时候是在开机流程中，init进程里面实例化。命令主要在如下逻辑中处理：
//frameworks/native/cmds/dumpsys/dumpsys.cppint Dumpsys::main(int argc, char* const argv[]) {//...static struct option longOptions[] = {{"help", no_argument, 0, 0}, {"clients", no_argument, 0, 0},{"dump", no_argument, 0, 0}, {"pid", no_argument, 0, 0},{"priority", required_argument, 0, 0}, {"proto", no_argument, 0, 0},{"skip", no_argument, 0, 0}, {"stability", no_argument, 0, 0},{"thread", no_argument, 0, 0}, {0, 0, 0, 0}};//...switch (c) {case 0:if (!strcmp(longOptions[optionIndex].name, "skip")) {skipServices = true;} else if (!strcmp(longOptions[optionIndex].name, "proto")) {asProto = true;} else if (!strcmp(longOptions[optionIndex].name, "help")) {usage();return 0;} else if (!strcmp(longOptions[optionIndex].name, "priority")) {priorityType = String16(String8(optarg));if (!ConvertPriorityTypeToBitmask(priorityType, priorityFlags)) {fprintf(stderr, "\n");usage();return -1;}} else if (!strcmp(longOptions[optionIndex].name, "dump")) {dumpTypeFlags |= TYPE_DUMP;} else if (!strcmp(longOptions[optionIndex].name, "pid")) {dumpTypeFlags |= TYPE_PID;} else if (!strcmp(longOptions[optionIndex].name, "stability")) {dumpTypeFlags |= TYPE_STABILITY;} else if (!strcmp(longOptions[optionIndex].name, "thread")) {dumpTypeFlags |= TYPE_THREAD;} else if (!strcmp(longOptions[optionIndex].name, "clients")) {dumpTypeFlags |= TYPE_CLIENTS;}break;//...}}//...for (size_t i = 0; i < N; i++) {const String16& serviceName = services[i];if (IsSkipped(skippedServices, serviceName)) continue;//这里通过startDumpThread来启动dump threadif (startDumpThread(dumpTypeFlags, serviceName, args) == OK) {bool addSeparator = (N > 1);if (addSeparator) {writeDumpHeader(STDOUT_FILENO, serviceName, priorityFlags);}std::chrono::duration<double> elapsedDuration;size_t bytesWritten = 0;status_t status =writeDump(STDOUT_FILENO, serviceName, std::chrono::milliseconds(timeoutArgMs),asProto, elapsedDuration, bytesWritten);if (status == TIMED_OUT) {std::cout << std::endl<< "*** SERVICE '" << serviceName << "' DUMP TIMEOUT (" << timeoutArgMs<< "ms) EXPIRED ***" << std::endl<< std::endl;}if (addSeparator) {writeDumpFooter(STDOUT_FILENO, serviceName, elapsedDuration);}bool dumpComplete = (status == OK);stopDumpThread(dumpComplete);}}return 0;
}
通过startDumpThread来调用dump函数进行处理。
status_t Dumpsys::startDumpThread(int dumpTypeFlags, const String16& serviceName,const Vector<String16>& args) {//通过serviceName来获取service对象sp<IBinder> service = sm_->checkService(serviceName);if (service == nullptr) {std::cerr << "Can't find service: " << serviceName << std::endl;return NAME_NOT_FOUND;}int sfd[2];if (pipe(sfd) != 0) {std::cerr << "Failed to create pipe to dump service info for " << serviceName << ": "<< strerror(errno) << std::endl;return -errno;}redirectFd_ = unique_fd(sfd[0]);unique_fd remote_end(sfd[1]);sfd[0] = sfd[1] = -1;// dump blocks until completion, so spawn a thread..activeThread_ = std::thread([=, remote_end{std::move(remote_end)}]() mutable {if (dumpTypeFlags & TYPE_PID) {status_t err = dumpPidToFd(service, remote_end, dumpTypeFlags == TYPE_PID);reportDumpError(serviceName, err, "dumping PID");}if (dumpTypeFlags & TYPE_STABILITY) {status_t err = dumpStabilityToFd(service, remote_end);reportDumpError(serviceName, err, "dumping stability");}if (dumpTypeFlags & TYPE_THREAD) {status_t err = dumpThreadsToFd(service, remote_end);reportDumpError(serviceName, err, "dumping thread info");}if (dumpTypeFlags & TYPE_CLIENTS) {status_t err = dumpClientsToFd(service, remote_end);reportDumpError(serviceName, err, "dumping clients info");}// other types always act as a header, this is usually longerif (dumpTypeFlags & TYPE_DUMP) {//调用相应service的dump函数status_t err = service->dump(remote_end.get(), args);reportDumpError(serviceName, err, "dumping");}});return OK;
}
在新起的线程中，执行某个service的dump函数，如此我们就只要看某个service的dump函数实现就好了，注意我们这些处理逻辑目前都是在native层，但是我们知道安卓是建立在Binder通信的CS架构，该dump()函数的声明是在Binder类中的，也就是我们需要找到服务端的dump()函数的真正实现哪里，如果是dumpsys activity a，那么真正实现是在java层的ActivityManagerService中，其他服务同理。
（3）部分示例
（A）PowerManagerService.java
//frameworks/base/services/core/java/com/android/server/power/PowerManagerService.javaprivate void dumpInternal(PrintWriter pw) {pw.println("POWER MANAGER (dumpsys power)\n");final WirelessChargerDetector wcd;final LowPowerStandbyController lowPowerStandbyController;synchronized (mLock) {pw.println("Power Manager State:");mConstants.dump(pw);pw.println(" mDirty=0x" + Integer.toHexString(mDirty));pw.println(" mWakefulness="+ PowerManagerInternal.wakefulnessToString(getGlobalWakefulnessLocked()));pw.println(" mWakefulnessChanging=" + mWakefulnessChanging);pw.println(" mIsPowered=" + mIsPowered);pw.println(" mPlugType=" + mPlugType);pw.println(" mBatteryLevel=" + mBatteryLevel);pw.println(" mBatteryLevelWhenDreamStarted=" + mBatteryLevelWhenDreamStarted);pw.println(" mDockState=" + mDockState);pw.println(" mStayOn=" + mStayOn);pw.println(" mProximityPositive=" + mProximityPositive);pw.println(" mBootCompleted=" + mBootCompleted);pw.println(" mSystemReady=" + mSystemReady);synchronized (mEnhancedDischargeTimeLock) {pw.println(" mEnhancedDischargeTimeElapsed=" + mEnhancedDischargeTimeElapsed);pw.println(" mLastEnhancedDischargeTimeUpdatedElapsed="+ mLastEnhancedDischargeTimeUpdatedElapsed);pw.println(" mEnhancedDischargePredictionIsPersonalized="+ mEnhancedDischargePredictionIsPersonalized);}pw.println(" mHalAutoSuspendModeEnabled=" + mHalAutoSuspendModeEnabled);pw.println(" mHalInteractiveModeEnabled=" + mHalInteractiveModeEnabled);pw.println(" mWakeLockSummary=0x" + Integer.toHexString(mWakeLockSummary));pw.print(" mNotifyLongScheduled=");if (mNotifyLongScheduled == 0) {pw.print("(none)");} else {TimeUtils.formatDuration(mNotifyLongScheduled, mClock.uptimeMillis(), pw);}pw.println();pw.print(" mNotifyLongDispatched=");if (mNotifyLongDispatched == 0) {pw.print("(none)");} else {TimeUtils.formatDuration(mNotifyLongDispatched, mClock.uptimeMillis(), pw);}pw.println();pw.print(" mNotifyLongNextCheck=");if (mNotifyLongNextCheck == 0) {pw.print("(none)");} else {TimeUtils.formatDuration(mNotifyLongNextCheck, mClock.uptimeMillis(), pw);}pw.println();pw.println(" mRequestWaitForNegativeProximity=" + mRequestWaitForNegativeProximity);pw.println(" mInterceptedPowerKeyForProximity="+ mInterceptedPowerKeyForProximity);pw.println(" mSandmanScheduled=" + mSandmanScheduled);pw.println(" mBatteryLevelLow=" + mBatteryLevelLow);pw.println(" mLightDeviceIdleMode=" + mLightDeviceIdleMode);pw.println(" mDeviceIdleMode=" + mDeviceIdleMode);pw.println(" mDeviceIdleWhitelist=" + Arrays.toString(mDeviceIdleWhitelist));pw.println(" mDeviceIdleTempWhitelist=" + Arrays.toString(mDeviceIdleTempWhitelist));pw.println(" mLowPowerStandbyActive=" + mLowPowerStandbyActive);pw.println(" mLastWakeTime=" + TimeUtils.formatUptime(mLastGlobalWakeTime));pw.println(" mLastSleepTime=" + TimeUtils.formatUptime(mLastGlobalSleepTime));pw.println(" mLastSleepReason=" + PowerManager.sleepReasonToString(mLastGlobalSleepReason));pw.println(" mLastInteractivePowerHintTime="+ TimeUtils.formatUptime(mLastInteractivePowerHintTime));pw.println(" mLastScreenBrightnessBoostTime="+ TimeUtils.formatUptime(mLastScreenBrightnessBoostTime));pw.println(" mScreenBrightnessBoostInProgress="+ mScreenBrightnessBoostInProgress);pw.println(" mHoldingWakeLockSuspendBlocker=" + mHoldingWakeLockSuspendBlocker);pw.println(" mHoldingDisplaySuspendBlocker=" + mHoldingDisplaySuspendBlocker);pw.println(" mLastFlipTime=" + mLastFlipTime);pw.println(" mIsFaceDown=" + mIsFaceDown);pw.println();pw.println("Settings and Configuration:");pw.println(" mDecoupleHalAutoSuspendModeFromDisplayConfig="+ mDecoupleHalAutoSuspendModeFromDisplayConfig);pw.println(" mDecoupleHalInteractiveModeFromDisplayConfig="+ mDecoupleHalInteractiveModeFromDisplayConfig);pw.println(" mWakeUpWhenPluggedOrUnpluggedConfig="+ mWakeUpWhenPluggedOrUnpluggedConfig);pw.println(" mWakeUpWhenPluggedOrUnpluggedInTheaterModeConfig="+ mWakeUpWhenPluggedOrUnpluggedInTheaterModeConfig);pw.println(" mTheaterModeEnabled="+ mTheaterModeEnabled);pw.println(" mSuspendWhenScreenOffDueToProximityConfig="+ mSuspendWhenScreenOffDueToProximityConfig);pw.println(" mDreamsSupportedConfig=" + mDreamsSupportedConfig);pw.println(" mDreamsEnabledByDefaultConfig=" + mDreamsEnabledByDefaultConfig);pw.println(" mDreamsActivatedOnSleepByDefaultConfig="+ mDreamsActivatedOnSleepByDefaultConfig);pw.println(" mDreamsActivatedOnDockByDefaultConfig="+ mDreamsActivatedOnDockByDefaultConfig);pw.println(" mDreamsEnabledOnBatteryConfig="+ mDreamsEnabledOnBatteryConfig);pw.println(" mDreamsBatteryLevelMinimumWhenPoweredConfig="+ mDreamsBatteryLevelMinimumWhenPoweredConfig);pw.println(" mDreamsBatteryLevelMinimumWhenNotPoweredConfig="+ mDreamsBatteryLevelMinimumWhenNotPoweredConfig);pw.println(" mDreamsBatteryLevelDrainCutoffConfig="+ mDreamsBatteryLevelDrainCutoffConfig);pw.println(" mDreamsEnabledSetting=" + mDreamsEnabledSetting);pw.println(" mDreamsActivateOnSleepSetting=" + mDreamsActivateOnSleepSetting);pw.println(" mDreamsActivateOnDockSetting=" + mDreamsActivateOnDockSetting);pw.println(" mDozeAfterScreenOff=" + mDozeAfterScreenOff);pw.println(" mMinimumScreenOffTimeoutConfig=" + mMinimumScreenOffTimeoutConfig);pw.println(" mMaximumScreenDimDurationConfig=" + mMaximumScreenDimDurationConfig);pw.println(" mMaximumScreenDimRatioConfig=" + mMaximumScreenDimRatioConfig);pw.println(" mAttentiveTimeoutConfig=" + mAttentiveTimeoutConfig);pw.println(" mAttentiveTimeoutSetting=" + mAttentiveTimeoutSetting);pw.println(" mAttentiveWarningDurationConfig=" + mAttentiveWarningDurationConfig);pw.println(" mScreenOffTimeoutSetting=" + mScreenOffTimeoutSetting);pw.println(" mSleepTimeoutSetting=" + mSleepTimeoutSetting);pw.println(" mMaximumScreenOffTimeoutFromDeviceAdmin="+ mMaximumScreenOffTimeoutFromDeviceAdmin + " (enforced="+ isMaximumScreenOffTimeoutFromDeviceAdminEnforcedLocked() + ")");pw.println(" mStayOnWhilePluggedInSetting=" + mStayOnWhilePluggedInSetting);pw.println(" mScreenBrightnessModeSetting=" + mScreenBrightnessModeSetting);pw.println(" mScreenBrightnessOverrideFromWindowManager="+ mScreenBrightnessOverrideFromWindowManager);pw.println(" mUserActivityTimeoutOverrideFromWindowManager="+ mUserActivityTimeoutOverrideFromWindowManager);pw.println(" mUserInactiveOverrideFromWindowManager="+ mUserInactiveOverrideFromWindowManager);pw.println(" mDozeScreenStateOverrideFromDreamManager="+ mDozeScreenStateOverrideFromDreamManager);pw.println(" mDrawWakeLockOverrideFromSidekick=" + mDrawWakeLockOverrideFromSidekick);pw.println(" mDozeScreenBrightnessOverrideFromDreamManager="+ mDozeScreenBrightnessOverrideFromDreamManager);pw.println(" mScreenBrightnessMinimum=" + mScreenBrightnessMinimum);pw.println(" mScreenBrightnessMaximum=" + mScreenBrightnessMaximum);pw.println(" mScreenBrightnessDefault=" + mScreenBrightnessDefault);pw.println(" mDoubleTapWakeEnabled=" + mDoubleTapWakeEnabled);pw.println(" mIsVrModeEnabled=" + mIsVrModeEnabled);pw.println(" mForegroundProfile=" + mForegroundProfile);pw.println(" mUserId=" + mUserId);final long attentiveTimeout = getAttentiveTimeoutLocked();final long sleepTimeout = getSleepTimeoutLocked(attentiveTimeout);final long screenOffTimeout = getScreenOffTimeoutLocked(sleepTimeout, attentiveTimeout);final long screenDimDuration = getScreenDimDurationLocked(screenOffTimeout);pw.println();pw.println("Attentive timeout: " + attentiveTimeout + " ms");pw.println("Sleep timeout: " + sleepTimeout + " ms");pw.println("Screen off timeout: " + screenOffTimeout + " ms");pw.println("Screen dim duration: " + screenDimDuration + " ms");pw.println();pw.print("UID states (changing=");pw.print(mUidsChanging);pw.print(" changed=");pw.print(mUidsChanged);pw.println("):");for (int i=0; i<mUidState.size(); i++) {final UidState state = mUidState.valueAt(i);pw.print(" UID "); UserHandle.formatUid(pw, mUidState.keyAt(i));pw.print(": ");if (state.mActive) pw.print(" ACTIVE ");else pw.print("INACTIVE ");pw.print(" count=");pw.print(state.mNumWakeLocks);pw.print(" state=");pw.println(state.mProcState);}pw.println();pw.println("Looper state:");mHandler.getLooper().dump(new PrintWriterPrinter(pw), " ");pw.println();pw.println("Wake Locks: size=" + mWakeLocks.size());for (WakeLock wl : mWakeLocks) {pw.println(" " + wl);}pw.println();pw.println("Suspend Blockers: size=" + mSuspendBlockers.size());for (SuspendBlocker sb : mSuspendBlockers) {pw.println(" " + sb);}pw.println();pw.println("Display Power: " + mDisplayPowerCallbacks);mBatterySaverPolicy.dump(pw);mBatterySaverStateMachine.dump(pw);mAttentionDetector.dump(pw);pw.println();final int numProfiles = mProfilePowerState.size();pw.println("Profile power states: size=" + numProfiles);for (int i = 0; i < numProfiles; i++) {final ProfilePowerState profile = mProfilePowerState.valueAt(i);pw.print(" mUserId=");pw.print(profile.mUserId);pw.print(" mScreenOffTimeout=");pw.print(profile.mScreenOffTimeout);pw.print(" mWakeLockSummary=");pw.print(profile.mWakeLockSummary);pw.print(" mLastUserActivityTime=");pw.print(profile.mLastUserActivityTime);pw.print(" mLockingNotified=");pw.println(profile.mLockingNotified);}pw.println("Display Group User Activity:");for (int idx = 0; idx < mPowerGroups.size(); idx++) {final PowerGroup powerGroup = mPowerGroups.valueAt(idx);pw.println(" displayGroupId=" + powerGroup.getGroupId());pw.println(" userActivitySummary=0x" + Integer.toHexString(powerGroup.getUserActivitySummaryLocked()));pw.println(" lastUserActivityTime=" + TimeUtils.formatUptime(powerGroup.getLastUserActivityTimeLocked()));pw.println(" lastUserActivityTimeNoChangeLights=" + TimeUtils.formatUptime(powerGroup.getLastUserActivityTimeNoChangeLightsLocked()));pw.println(" mWakeLockSummary=0x" + Integer.toHexString(powerGroup.getWakeLockSummaryLocked()));}wcd = mWirelessChargerDetector;}if (wcd != null) {wcd.dump(pw);}if (mNotifier != null) {mNotifier.dump(pw);}mFaceDownDetector.dump(pw);mAmbientDisplaySuppressionController.dump(pw);mLowPowerStandbyController.dump(pw);}
（B）PackageManagerService.java
//frameworks/base/services/core/java/com/android/server/pm/DumpHelper.javapublic void doDump(Computer snapshot, FileDescriptor fd, PrintWriter pw, String[] args) {DumpState dumpState = new DumpState();ArraySet<String> permissionNames = null;int opti = 0;while (opti < args.length) {String opt = args[opti];if (opt == null || opt.length() <= 0 || opt.charAt(0) != '-') {break;}opti++;if ("-a".equals(opt)) {// Right now we only know how to print all.} else if ("-h".equals(opt)) {printHelp(pw);return;} else if ("--checkin".equals(opt)) {dumpState.setCheckIn(true);} else if ("--all-components".equals(opt)) {dumpState.setOptionEnabled(DumpState.OPTION_DUMP_ALL_COMPONENTS);} else if ("-f".equals(opt)) {dumpState.setOptionEnabled(DumpState.OPTION_SHOW_FILTERS);} else if ("--proto".equals(opt)) {dumpProto(snapshot, fd);return;} else {pw.println("Unknown argument: " + opt + "; use -h for help");}}// Is the caller requesting to dump a particular piece of data?if (opti < args.length) {String cmd = args[opti];opti++;// Is this a package name?if ("android".equals(cmd) || cmd.contains(".")) {dumpState.setTargetPackageName(cmd);// When dumping a single package, we always dump all of its// filter information since the amount of data will be reasonable.dumpState.setOptionEnabled(DumpState.OPTION_SHOW_FILTERS);} else if ("check-permission".equals(cmd)) {if (opti >= args.length) {pw.println("Error: check-permission missing permission argument");return;}String perm = args[opti];opti++;if (opti >= args.length) {pw.println("Error: check-permission missing package argument");return;}String pkg = args[opti];opti++;int user = UserHandle.getUserId(Binder.getCallingUid());if (opti < args.length) {try {user = Integer.parseInt(args[opti]);} catch (NumberFormatException e) {pw.println("Error: check-permission user argument is not a number: "+ args[opti]);return;}}// Normalize package name to handle renamed packages and static libspkg = snapshot.resolveInternalPackageName(pkg,PackageManager.VERSION_CODE_HIGHEST);pw.println(mPermissionManager.checkPermission(perm, pkg, user));return;} else if ("l".equals(cmd) || "libraries".equals(cmd)) {dumpState.setDump(DumpState.DUMP_LIBS);} else if ("f".equals(cmd) || "features".equals(cmd)) {dumpState.setDump(DumpState.DUMP_FEATURES);} else if ("r".equals(cmd) || "resolvers".equals(cmd)) {if (opti >= args.length) {dumpState.setDump(DumpState.DUMP_ACTIVITY_RESOLVERS| DumpState.DUMP_SERVICE_RESOLVERS| DumpState.DUMP_RECEIVER_RESOLVERS| DumpState.DUMP_CONTENT_RESOLVERS);} else {while (opti < args.length) {String name = args[opti];if ("a".equals(name) || "activity".equals(name)) {dumpState.setDump(DumpState.DUMP_ACTIVITY_RESOLVERS);} else if ("s".equals(name) || "service".equals(name)) {dumpState.setDump(DumpState.DUMP_SERVICE_RESOLVERS);} else if ("r".equals(name) || "receiver".equals(name)) {dumpState.setDump(DumpState.DUMP_RECEIVER_RESOLVERS);} else if ("c".equals(name) || "content".equals(name)) {dumpState.setDump(DumpState.DUMP_CONTENT_RESOLVERS);} else {pw.println("Error: unknown resolver table type: " + name);return;}opti++;}}} else if ("perm".equals(cmd) || "permissions".equals(cmd)) {dumpState.setDump(DumpState.DUMP_PERMISSIONS);} else if ("permission".equals(cmd)) {if (opti >= args.length) {pw.println("Error: permission requires permission name");return;}permissionNames = new ArraySet<>();while (opti < args.length) {permissionNames.add(args[opti]);opti++;}dumpState.setDump(DumpState.DUMP_PERMISSIONS| DumpState.DUMP_PACKAGES | DumpState.DUMP_SHARED_USERS);} else if ("pref".equals(cmd) || "preferred".equals(cmd)) {dumpState.setDump(DumpState.DUMP_PREFERRED);} else if ("preferred-xml".equals(cmd)) {dumpState.setDump(DumpState.DUMP_PREFERRED_XML);if (opti < args.length && "--full".equals(args[opti])) {dumpState.setFullPreferred(true);opti++;}} else if ("d".equals(cmd) || "domain-preferred-apps".equals(cmd)) {dumpState.setDump(DumpState.DUMP_DOMAIN_PREFERRED);} else if ("p".equals(cmd) || "packages".equals(cmd)) {dumpState.setDump(DumpState.DUMP_PACKAGES);} else if ("q".equals(cmd) || "queries".equals(cmd)) {dumpState.setDump(DumpState.DUMP_QUERIES);} else if ("s".equals(cmd) || "shared-users".equals(cmd)) {dumpState.setDump(DumpState.DUMP_SHARED_USERS);if (opti < args.length && "noperm".equals(args[opti])) {dumpState.setOptionEnabled(DumpState.OPTION_SKIP_PERMISSIONS);}} else if ("prov".equals(cmd) || "providers".equals(cmd)) {dumpState.setDump(DumpState.DUMP_PROVIDERS);} else if ("m".equals(cmd) || "messages".equals(cmd)) {dumpState.setDump(DumpState.DUMP_MESSAGES);} else if ("v".equals(cmd) || "verifiers".equals(cmd)) {dumpState.setDump(DumpState.DUMP_VERIFIERS);} else if ("dv".equals(cmd) || "domain-verifier".equals(cmd)) {dumpState.setDump(DumpState.DUMP_DOMAIN_VERIFIER);} else if ("version".equals(cmd)) {dumpState.setDump(DumpState.DUMP_VERSION);} else if ("k".equals(cmd) || "keysets".equals(cmd)) {dumpState.setDump(DumpState.DUMP_KEYSETS);} else if ("installs".equals(cmd)) {dumpState.setDump(DumpState.DUMP_INSTALLS);} else if ("frozen".equals(cmd)) {dumpState.setDump(DumpState.DUMP_FROZEN);} else if ("volumes".equals(cmd)) {dumpState.setDump(DumpState.DUMP_VOLUMES);} else if ("dexopt".equals(cmd)) {dumpState.setDump(DumpState.DUMP_DEXOPT);} else if ("compiler-stats".equals(cmd)) {dumpState.setDump(DumpState.DUMP_COMPILER_STATS);} else if ("changes".equals(cmd)) {dumpState.setDump(DumpState.DUMP_CHANGES);} else if ("service-permissions".equals(cmd)) {dumpState.setDump(DumpState.DUMP_SERVICE_PERMISSIONS);} else if ("known-packages".equals(cmd)) {dumpState.setDump(DumpState.DUMP_KNOWN_PACKAGES);} else if ("t".equals(cmd) || "timeouts".equals(cmd)) {dumpState.setDump(DumpState.DUMP_PER_UID_READ_TIMEOUTS);} else if ("snapshot".equals(cmd)) {dumpState.setDump(DumpState.DUMP_SNAPSHOT_STATISTICS);if (opti < args.length) {if ("--full".equals(args[opti])) {dumpState.setBrief(false);opti++;} else if ("--brief".equals(args[opti])) {dumpState.setBrief(true);opti++;}}} else if ("protected-broadcasts".equals(cmd)) {dumpState.setDump(DumpState.DUMP_PROTECTED_BROADCASTS);} else if (sPmsExt.dumpCmdHandle(cmd, pw, args, opti)) {return;}}//...}}
（C）CameraService.cpp（media.camera）
//frameworks/av/services/camera/libcameraservice/CameraService.cppstatus_t CameraService::dump(int fd, const Vector<String16>& args) {ATRACE_CALL();if (checkCallingPermission(sDumpPermission) == false) {dprintf(fd, "Permission Denial: can't dump CameraService from pid=%d, uid=%d\n",CameraThreadState::getCallingPid(),CameraThreadState::getCallingUid());return NO_ERROR;}bool locked = tryLock(mServiceLock);// failed to lock - CameraService is probably deadlockedif (!locked) {dprintf(fd, "!! CameraService may be deadlocked !!\n");}if (!mInitialized) {dprintf(fd, "!! No camera HAL available !!\n");// Dump event log for error informationdumpEventLog(fd);if (locked) mServiceLock.unlock();return NO_ERROR;}dprintf(fd, "\n== Service global info: ==\n\n");dprintf(fd, "Number of camera devices: %d\n", mNumberOfCameras);dprintf(fd, "Number of normal camera devices: %zu\n", mNormalDeviceIds.size());dprintf(fd, "Number of public camera devices visible to API1: %zu\n",mNormalDeviceIdsWithoutSystemCamera.size());for (size_t i = 0; i < mNormalDeviceIds.size(); i++) {dprintf(fd, " Device %zu maps to \"%s\"\n", i, mNormalDeviceIds[i].c_str());}String8 activeClientString = mActiveClientManager.toString();dprintf(fd, "Active Camera Clients:\n%s", activeClientString.string());dprintf(fd, "Allowed user IDs: %s\n", toString(mAllowedUsers).string());dumpEventLog(fd);bool stateLocked = tryLock(mCameraStatesLock);if (!stateLocked) {dprintf(fd, "CameraStates in use, may be deadlocked\n");}int argSize = args.size();for (int i = 0; i < argSize; i++) {if (args[i] == TagMonitor::kMonitorOption) {if (i + 1 < argSize) {mMonitorTags = String8(args[i + 1]);}break;}}for (auto& state : mCameraStates) {String8 cameraId = state.first;dprintf(fd, "== Camera device %s dynamic info: ==\n", cameraId.string());CameraParameters p = state.second->getShimParams();if (!p.isEmpty()) {dprintf(fd, " Camera1 API shim is using parameters:\n ");p.dump(fd, args);}auto clientDescriptor = mActiveClientManager.get(cameraId);if (clientDescriptor != nullptr) {// log the current open session infodumpOpenSessionClientLogs(fd, args, cameraId);} else {dumpClosedSessionClientLogs(fd, cameraId);}}if (stateLocked) mCameraStatesLock.unlock();if (locked) mServiceLock.unlock();mCameraProviderManager->dump(fd, args);dprintf(fd, "\n== Vendor tags: ==\n\n");sp<VendorTagDescriptor> desc = VendorTagDescriptor::getGlobalVendorTagDescriptor();if (desc == NULL) {sp<VendorTagDescriptorCache> cache =VendorTagDescriptorCache::getGlobalVendorTagCache();if (cache == NULL) {dprintf(fd, "No vendor tags.\n");} else {cache->dump(fd, /*verbosity*/2, /*indentation*/2);}} else {desc->dump(fd, /*verbosity*/2, /*indentation*/2);}// Dump camera traces if there were anydprintf(fd, "\n");camera3::CameraTraces::dump(fd);// Process dump arguments, if anyint n = args.size();String16 verboseOption("-v");String16 unreachableOption("--unreachable");for (int i = 0; i < n; i++) {if (args[i] == verboseOption) {// change logging levelif (i + 1 >= n) continue;String8 levelStr(args[i+1]);int level = atoi(levelStr.string());dprintf(fd, "\nSetting log level to %d.\n", level);setLogLevel(level);} else if (args[i] == unreachableOption) {// Dump memory analysis// TODO - should limit be an argument parameter?UnreachableMemoryInfo info;bool success = GetUnreachableMemory(info, /*limit*/ 10000);if (!success) {dprintf(fd, "\n== Unable to dump unreachable memory. ""Try disabling SELinux enforcement. ==\n");} else {dprintf(fd, "\n== Dumping unreachable memory: ==\n");std::string s = info.ToString(/*log_contents*/ true);write(fd, s.c_str(), s.size());}}}bool serviceLocked = tryLock(mServiceLock);// Dump info from previous open sessions.// Reposition the offset to beginning of the file before readingif ((mMemFd >= 0) && (lseek(mMemFd, 0, SEEK_SET) != -1)) {dprintf(fd, "\n**********Dumpsys from previous open session**********\n");ssize_t size_read;char buf[4096];while ((size_read = read(mMemFd, buf, (sizeof(buf) - 1))) > 0) {// Read data from file to a small buffer and write it to fd.write(fd, buf, size_read);if (size_read == -1) {ALOGE("%s: Error during reading the file: %s", __FUNCTION__, sFileName);break;}}dprintf(fd, "\n**********End of Dumpsys from previous open session**********\n");} else {ALOGE("%s: Error during reading the file: %s", __FUNCTION__, sFileName);}if (serviceLocked) mServiceLock.unlock();return NO_ERROR;
}
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