Revert "init: handle property service callbacks asynchronously" (01882741) · Commits · e / os / android_system_core

init/Android.bp

+0 −2

Original line number	Diff line number	Diff line
		@@ -28,7 +28,6 @@ init_common_sources = [
		"rlimit_parser.cpp",
		"service.cpp",
		"service_list.cpp",
		"service_lock.cpp",
		"service_parser.cpp",
		"service_utils.cpp",
		"subcontext.cpp",
		@@ -82,7 +81,6 @@ cc_defaults {
		"-Wextra",
		"-Wno-unused-parameter",
		"-Werror",
		"-Wthread-safety",
		"-DALLOW_FIRST_STAGE_CONSOLE=0",
		"-DALLOW_LOCAL_PROP_OVERRIDE=0",
		"-DALLOW_PERMISSIVE_SELINUX=0",

init/action_manager.cpp

+7 −15

Original line number	Diff line number	Diff line
		@@ -41,12 +41,10 @@ void ActionManager::AddAction(std::unique_ptr<Action> action) {
		}

		void ActionManager::QueueEventTrigger(const std::string& trigger) {
		auto lock = std::lock_guard{event_queue_lock_};
		event_queue_.emplace(trigger);
		}

		void ActionManager::QueuePropertyChange(const std::string& name, const std::string& value) {
		auto lock = std::lock_guard{event_queue_lock_};
		event_queue_.emplace(std::make_pair(name, value));
		}

		@@ -55,7 +53,6 @@ void ActionManager::QueueAllPropertyActions() {
		}

		void ActionManager::QueueBuiltinAction(BuiltinFunction func, const std::string& name) {
		auto lock = std::lock_guard{event_queue_lock_};
		auto action = std::make_unique<Action>(true, nullptr, "<Builtin Action>", 0, name,
		std::map<std::string, std::string>{});
		action->AddCommand(std::move(func), {name}, 0);
		@@ -65,8 +62,6 @@ void ActionManager::QueueBuiltinAction(BuiltinFunction func, const std::string&
		}

		void ActionManager::ExecuteOneCommand() {
		{
		auto lock = std::lock_guard{event_queue_lock_};
		// Loop through the event queue until we have an action to execute
		while (current_executing_actions_.empty() && !event_queue_.empty()) {
		for (const auto& action : actions_) {
		@@ -77,7 +72,6 @@ void ActionManager::ExecuteOneCommand() {
		}
		event_queue_.pop();
		}
		}

		if (current_executing_actions_.empty()) {
		return;
		@@ -109,7 +103,6 @@ void ActionManager::ExecuteOneCommand() {
		}

		bool ActionManager::HasMoreCommands() const {
		auto lock = std::lock_guard{event_queue_lock_};
		return !current_executing_actions_.empty() \|\| !event_queue_.empty();
		}

		@@ -120,7 +113,6 @@ void ActionManager::DumpState() const {
		}

		void ActionManager::ClearQueue() {
		auto lock = std::lock_guard{event_queue_lock_};
		// We are shutting down so don't claim the oneshot builtin actions back
		current_executing_actions_ = {};
		event_queue_ = {};

init/action_manager.h

+1 −6

Original line number	Diff line number	Diff line
		@@ -16,12 +16,9 @@

		#pragma once

		#include <mutex>
		#include <string>
		#include <vector>

		#include <android-base/thread_annotations.h>

		#include "action.h"
		#include "builtins.h"

		@@ -51,9 +48,7 @@ class ActionManager {
		void operator=(ActionManager const&) = delete;

		std::vector<std::unique_ptr<Action>> actions_;
		std::queue<std::variant<EventTrigger, PropertyChange, BuiltinAction>> event_queue_
		GUARDED_BY(event_queue_lock_);
		mutable std::mutex event_queue_lock_;
		std::queue<std::variant<EventTrigger, PropertyChange, BuiltinAction>> event_queue_;
		std::queue<const Action*> current_executing_actions_;
		std::size_t current_command_;
		};

init/builtins.cpp

+0 −15

Original line number	Diff line number	Diff line
		@@ -151,7 +151,6 @@ static Result<void> reboot_into_recovery(const std::vector<std::string>& options

		template <typename F>
		static void ForEachServiceInClass(const std::string& classname, F function) {
		auto lock = std::lock_guard{service_lock};
		for (const auto& service : ServiceList::GetInstance()) {
		if (service->classnames().count(classname)) std::invoke(function, service);
		}
		@@ -163,7 +162,6 @@ static Result<void> do_class_start(const BuiltinArguments& args) {
		return {};
		// Starting a class does not start services which are explicitly disabled.
		// They must be started individually.
		auto lock = std::lock_guard{service_lock};
		for (const auto& service : ServiceList::GetInstance()) {
		if (service->classnames().count(args[1])) {
		if (auto result = service->StartIfNotDisabled(); !result.ok()) {
		@@ -186,7 +184,6 @@ static Result<void> do_class_start_post_data(const BuiltinArguments& args) {
		// stopped either.
		return {};
		}
		auto lock = std::lock_guard{service_lock};
		for (const auto& service : ServiceList::GetInstance()) {
		if (service->classnames().count(args[1])) {
		if (auto result = service->StartIfPostData(); !result.ok()) {
		@@ -237,7 +234,6 @@ static Result<void> do_domainname(const BuiltinArguments& args) {
		}

		static Result<void> do_enable(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		Service* svc = ServiceList::GetInstance().FindService(args[1]);
		if (!svc) return Error() << "Could not find service";

		@@ -249,7 +245,6 @@ static Result<void> do_enable(const BuiltinArguments& args) {
		}

		static Result<void> do_exec(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		auto service = Service::MakeTemporaryOneshotService(args.args);
		if (!service.ok()) {
		return Error() << "Could not create exec service: " << service.error();
		@@ -263,7 +258,6 @@ static Result<void> do_exec(const BuiltinArguments& args) {
		}

		static Result<void> do_exec_background(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		auto service = Service::MakeTemporaryOneshotService(args.args);
		if (!service.ok()) {
		return Error() << "Could not create exec background service: " << service.error();
		@@ -277,7 +271,6 @@ static Result<void> do_exec_background(const BuiltinArguments& args) {
		}

		static Result<void> do_exec_start(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		Service* service = ServiceList::GetInstance().FindService(args[1]);
		if (!service) {
		return Error() << "Service not found";
		@@ -347,7 +340,6 @@ static Result<void> do_insmod(const BuiltinArguments& args) {
		}

		static Result<void> do_interface_restart(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		Service* svc = ServiceList::GetInstance().FindInterface(args[1]);
		if (!svc) return Error() << "interface " << args[1] << " not found";
		svc->Restart();
		@@ -355,7 +347,6 @@ static Result<void> do_interface_restart(const BuiltinArguments& args) {
		}

		static Result<void> do_interface_start(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		Service* svc = ServiceList::GetInstance().FindInterface(args[1]);
		if (!svc) return Error() << "interface " << args[1] << " not found";
		if (auto result = svc->Start(); !result.ok()) {
		@@ -365,7 +356,6 @@ static Result<void> do_interface_start(const BuiltinArguments& args) {
		}

		static Result<void> do_interface_stop(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		Service* svc = ServiceList::GetInstance().FindInterface(args[1]);
		if (!svc) return Error() << "interface " << args[1] << " not found";
		svc->Stop();
		@@ -750,7 +740,6 @@ static Result<void> do_setrlimit(const BuiltinArguments& args) {
		}

		static Result<void> do_start(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		Service* svc = ServiceList::GetInstance().FindService(args[1]);
		if (!svc) return Error() << "service " << args[1] << " not found";
		if (auto result = svc->Start(); !result.ok()) {
		@@ -760,7 +749,6 @@ static Result<void> do_start(const BuiltinArguments& args) {
		}

		static Result<void> do_stop(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		Service* svc = ServiceList::GetInstance().FindService(args[1]);
		if (!svc) return Error() << "service " << args[1] << " not found";
		svc->Stop();
		@@ -768,7 +756,6 @@ static Result<void> do_stop(const BuiltinArguments& args) {
		}

		static Result<void> do_restart(const BuiltinArguments& args) {
		auto lock = std::lock_guard{service_lock};
		Service* svc = ServiceList::GetInstance().FindService(args[1]);
		if (!svc) return Error() << "service " << args[1] << " not found";
		svc->Restart();
		@@ -1124,7 +1111,6 @@ static Result<void> ExecWithFunctionOnFailure(const std::vector<std::string>& ar
		function(StringPrintf("Exec service failed, status %d", siginfo.si_status));
		}
		});
		auto lock = std::lock_guard{service_lock};
		if (auto result = (*service)->ExecStart(); !result.ok()) {
		function("ExecStart failed: " + result.error().message());
		}
		@@ -1264,7 +1250,6 @@ static Result<void> parse_apex_configs() {
		}
		success &= parser.ParseConfigFile(c);
		}
		auto lock = std::lock_guard{service_lock};
		ServiceList::GetInstance().MarkServicesUpdate();
		if (success) {
		return {};

init/init.cpp

+111 −168

Original line number	Diff line number	Diff line
		@@ -33,9 +33,7 @@
		#include <functional>
		#include <map>
		#include <memory>
		#include <mutex>
		#include <optional>
		#include <thread>
		#include <vector>

		#include <android-base/chrono_utils.h>
		@@ -97,148 +95,15 @@ static int property_triggers_enabled = 0;
		static int signal_fd = -1;
		static int property_fd = -1;

		static std::unique_ptr<Subcontext> subcontext;

		// Init epolls various FDs to wait for various inputs. It previously waited on property changes
		// with a blocking socket that contained the information related to the change, however, it was easy
		// to fill that socket and deadlock the system. Now we use locks to handle the property changes
		// directly in the property thread, however we still must wake the epoll to inform init that there
		// is a change to process, so we use this FD. It is non-blocking, since we do not care how many
		// times WakeEpoll() is called, only that the epoll will wake.
		static int wake_epoll_fd = -1;
		static void InstallInitNotifier(Epoll* epoll) {
		int sockets[2];
		if (socketpair(AF_UNIX, SOCK_STREAM \| SOCK_CLOEXEC \| SOCK_NONBLOCK, 0, sockets) != 0) {
		PLOG(FATAL) << "Failed to socketpair() between property_service and init";
		}
		int epoll_fd = sockets[0];
		wake_epoll_fd = sockets[1];

		auto drain_socket = [epoll_fd] {
		char buf[512];
		while (read(epoll_fd, buf, sizeof(buf)) > 0) {
		}
		};

		if (auto result = epoll->RegisterHandler(epoll_fd, drain_socket); !result) {
		LOG(FATAL) << result.error();
		}
		}

		static void WakeEpoll() {
		constexpr char value[] = "1";
		write(wake_epoll_fd, value, sizeof(value));
		}

		static class PropWaiterState {
		public:
		bool StartWaiting(const char* name, const char* value) {
		auto lock = std::lock_guard{lock_};
		if (waiting_for_prop_) {
		return false;
		}
		if (GetProperty(name, "") != value) {
		// Current property value is not equal to expected value
		wait_prop_name_ = name;
		wait_prop_value_ = value;
		waiting_for_prop_.reset(new Timer());
		} else {
		LOG(INFO) << "start_waiting_for_property(\"" << name << "\", \"" << value
		<< "\"): already set";
		}
		return true;
		}

		void ResetWaitForProp() {
		auto lock = std::lock_guard{lock_};
		ResetWaitForPropLocked();
		}

		void CheckAndResetWait(const std::string& name, const std::string& value) {
		auto lock = std::lock_guard{lock_};
		// We always record how long init waited for ueventd to tell us cold boot finished.
		// If we aren't waiting on this property, it means that ueventd finished before we even
		// started to wait.
		if (name == kColdBootDoneProp) {
		auto time_waited = waiting_for_prop_ ? waiting_for_prop_->duration().count() : 0;
		std::thread([time_waited] {
		SetProperty("ro.boottime.init.cold_boot_wait", std::to_string(time_waited));
		}).detach();
		}

		if (waiting_for_prop_) {
		if (wait_prop_name_ == name && wait_prop_value_ == value) {
		LOG(INFO) << "Wait for property '" << wait_prop_name_ << "=" << wait_prop_value_
		<< "' took " << *waiting_for_prop_;
		ResetWaitForPropLocked();
		WakeEpoll();
		}
		}
		}

		// This is not thread safe because it releases the lock when it returns, so the waiting state
		// may change. However, we only use this function to prevent running commands in the main
		// thread loop when we are waiting, so we do not care about false positives; only false
		// negatives. StartWaiting() and this function are always called from the same thread, so false
		// negatives are not possible and therefore we're okay.
		bool MightBeWaiting() {
		auto lock = std::lock_guard{lock_};
		return static_cast<bool>(waiting_for_prop_);
		}

		private:
		void ResetWaitForPropLocked() {
		wait_prop_name_.clear();
		wait_prop_value_.clear();
		waiting_for_prop_.reset();
		}

		std::mutex lock_;
		std::unique_ptr<Timer> waiting_for_prop_{nullptr};
		std::string wait_prop_name_;
		std::string wait_prop_value_;

		} prop_waiter_state;

		bool start_waiting_for_property(const char* name, const char* value) {
		return prop_waiter_state.StartWaiting(name, value);
		}

		void ResetWaitForProp() {
		prop_waiter_state.ResetWaitForProp();
		}

		static class ShutdownState {
		public:
		void TriggerShutdown(const std::string& command) {
		// We can't call HandlePowerctlMessage() directly in this function,
		// because it modifies the contents of the action queue, which can cause the action queue
		// to get into a bad state if this function is called from a command being executed by the
		// action queue. Instead we set this flag and ensure that shutdown happens before the next
		// command is run in the main init loop.
		auto lock = std::lock_guard{shutdown_command_lock_};
		shutdown_command_ = command;
		do_shutdown_ = true;
		WakeEpoll();
		}
		static std::unique_ptr<Timer> waiting_for_prop(nullptr);
		static std::string wait_prop_name;
		static std::string wait_prop_value;
		static std::string shutdown_command;
		static bool do_shutdown = false;

		std::optional<std::string> CheckShutdown() {
		auto lock = std::lock_guard{shutdown_command_lock_};
		if (do_shutdown_ && !IsShuttingDown()) {
		do_shutdown_ = false;
		return shutdown_command_;
		}
		return {};
		}

		private:
		std::mutex shutdown_command_lock_;
		std::string shutdown_command_;
		bool do_shutdown_ = false;
		} shutdown_state;
		static std::unique_ptr<Subcontext> subcontext;

		void DumpState() {
		auto lock = std::lock_guard{service_lock};
		ServiceList::GetInstance().DumpState();
		ActionManager::GetInstance().DumpState();
		}
		@@ -291,7 +156,39 @@ static void LoadBootScripts(ActionManager& action_manager, ServiceList& service_
		}
		}

		void PropertyChanged(const std::string& name, const std::string& value) {
		bool start_waiting_for_property(const char* name, const char* value) {
		if (waiting_for_prop) {
		return false;
		}
		if (GetProperty(name, "") != value) {
		// Current property value is not equal to expected value
		wait_prop_name = name;
		wait_prop_value = value;
		waiting_for_prop.reset(new Timer());
		} else {
		LOG(INFO) << "start_waiting_for_property(\"" << name << "\", \"" << value
		<< "\"): already set";
		}
		return true;
		}

		void ResetWaitForProp() {
		wait_prop_name.clear();
		wait_prop_value.clear();
		waiting_for_prop.reset();
		}

		static void TriggerShutdown(const std::string& command) {
		// We can't call HandlePowerctlMessage() directly in this function,
		// because it modifies the contents of the action queue, which can cause the action queue
		// to get into a bad state if this function is called from a command being executed by the
		// action queue. Instead we set this flag and ensure that shutdown happens before the next
		// command is run in the main init loop.
		shutdown_command = command;
		do_shutdown = true;
		}

		void property_changed(const std::string& name, const std::string& value) {
		// If the property is sys.powerctl, we bypass the event queue and immediately handle it.
		// This is to ensure that init will always and immediately shutdown/reboot, regardless of
		// if there are other pending events to process or if init is waiting on an exec service or
		@@ -299,20 +196,30 @@ void PropertyChanged(const std::string& name, const std::string& value) {
		// In non-thermal-shutdown case, 'shutdown' trigger will be fired to let device specific
		// commands to be executed.
		if (name == "sys.powerctl") {
		trigger_shutdown(value);
		TriggerShutdown(value);
		}

		if (property_triggers_enabled) {
		ActionManager::GetInstance().QueuePropertyChange(name, value);
		WakeEpoll();
		if (property_triggers_enabled) ActionManager::GetInstance().QueuePropertyChange(name, value);

		// We always record how long init waited for ueventd to tell us cold boot finished.
		// If we aren't waiting on this property, it means that ueventd finished before we even started
		// to wait.
		if (name == kColdBootDoneProp) {
		auto time_waited = waiting_for_prop ? waiting_for_prop->duration().count() : 0;
		SetProperty("ro.boottime.init.cold_boot_wait", std::to_string(time_waited));
		}

		prop_waiter_state.CheckAndResetWait(name, value);
		if (waiting_for_prop) {
		if (wait_prop_name == name && wait_prop_value == value) {
		LOG(INFO) << "Wait for property '" << wait_prop_name << "=" << wait_prop_value
		<< "' took " << *waiting_for_prop;
		ResetWaitForProp();
		}
		}
		}

		static std::optional<boot_clock::time_point> HandleProcessActions() {
		std::optional<boot_clock::time_point> next_process_action_time;
		auto lock = std::lock_guard{service_lock};
		for (const auto& s : ServiceList::GetInstance()) {
		if ((s->flags() & SVC_RUNNING) && s->timeout_period()) {
		auto timeout_time = s->time_started() + *s->timeout_period();
		@@ -341,7 +248,7 @@ static std::optional<boot_clock::time_point> HandleProcessActions() {
		return next_process_action_time;
		}

		static Result<void> DoControlStart(Service* service) REQUIRES(service_lock) {
		static Result<void> DoControlStart(Service* service) {
		return service->Start();
		}

		@@ -350,7 +257,7 @@ static Result<void> DoControlStop(Service* service) {
		return {};
		}

		static Result<void> DoControlRestart(Service* service) REQUIRES(service_lock) {
		static Result<void> DoControlRestart(Service* service) {
		service->Restart();
		return {};
		}
		@@ -384,7 +291,7 @@ static const std::map<std::string, ControlMessageFunction>& get_control_message_
		return control_message_functions;
		}

		bool HandleControlMessage(const std::string& msg, const std::string& name, pid_t from_pid) {
		bool HandleControlMessage(const std::string& msg, const std::string& name, pid_t pid) {
		const auto& map = get_control_message_map();
		const auto it = map.find(msg);

		@@ -393,7 +300,7 @@ bool HandleControlMessage(const std::string& msg, const std::string& name, pid_t
		return false;
		}

		std::string cmdline_path = StringPrintf("proc/%d/cmdline", from_pid);
		std::string cmdline_path = StringPrintf("proc/%d/cmdline", pid);
		std::string process_cmdline;
		if (ReadFileToString(cmdline_path, &process_cmdline)) {
		std::replace(process_cmdline.begin(), process_cmdline.end(), '\0', ' ');
		@@ -404,8 +311,6 @@ bool HandleControlMessage(const std::string& msg, const std::string& name, pid_t

		const ControlMessageFunction& function = it->second;

		auto lock = std::lock_guard{service_lock};

		Service* svc = nullptr;

		switch (function.target) {
		@@ -423,24 +328,23 @@ bool HandleControlMessage(const std::string& msg, const std::string& name, pid_t

		if (svc == nullptr) {
		LOG(ERROR) << "Control message: Could not find '" << name << "' for ctl." << msg
		<< " from pid: " << from_pid << " (" << process_cmdline << ")";
		<< " from pid: " << pid << " (" << process_cmdline << ")";
		return false;
		}

		if (auto result = function.action(svc); !result.ok()) {
		LOG(ERROR) << "Control message: Could not ctl." << msg << " for '" << name
		<< "' from pid: " << from_pid << " (" << process_cmdline
		<< "): " << result.error();
		<< "' from pid: " << pid << " (" << process_cmdline << "): " << result.error();
		return false;
		}

		LOG(INFO) << "Control message: Processed ctl." << msg << " for '" << name
		<< "' from pid: " << from_pid << " (" << process_cmdline << ")";
		<< "' from pid: " << pid << " (" << process_cmdline << ")";
		return true;
		}

		static Result<void> wait_for_coldboot_done_action(const BuiltinArguments& args) {
		if (!prop_waiter_state.StartWaiting(kColdBootDoneProp, "true")) {
		if (!start_waiting_for_property(kColdBootDoneProp, "true")) {
		LOG(FATAL) << "Could not wait for '" << kColdBootDoneProp << "'";
		}

		@@ -588,7 +492,6 @@ void HandleKeychord(const std::vector<int>& keycodes) {
		}

		auto found = false;
		auto lock = std::lock_guard{service_lock};
		for (const auto& service : ServiceList::GetInstance()) {
		auto svc = service.get();
		if (svc->keycodes() == keycodes) {
		@@ -675,6 +578,44 @@ void SendStartSendingMessagesMessage() {
		}
		}

		static void HandlePropertyFd() {
		auto message = ReadMessage(property_fd);
		if (!message.ok()) {
		LOG(ERROR) << "Could not read message from property service: " << message.error();
		return;
		}

		auto property_message = PropertyMessage{};
		if (!property_message.ParseFromString(*message)) {
		LOG(ERROR) << "Could not parse message from property service";
		return;
		}

		switch (property_message.msg_case()) {
		case PropertyMessage::kControlMessage: {
		auto& control_message = property_message.control_message();
		bool success = HandleControlMessage(control_message.msg(), control_message.name(),
		control_message.pid());

		uint32_t response = success ? PROP_SUCCESS : PROP_ERROR_HANDLE_CONTROL_MESSAGE;
		if (control_message.has_fd()) {
		int fd = control_message.fd();
		TEMP_FAILURE_RETRY(send(fd, &response, sizeof(response), 0));
		close(fd);
		}
		break;
		}
		case PropertyMessage::kChangedMessage: {
		auto& changed_message = property_message.changed_message();
		property_changed(changed_message.name(), changed_message.value());
		break;
		}
		default:
		LOG(ERROR) << "Unknown message type from property service: "
		<< property_message.msg_case();
		}
		}

		int SecondStageMain(int argc, char** argv) {
		if (REBOOT_BOOTLOADER_ON_PANIC) {
		InstallRebootSignalHandlers();
		@@ -682,7 +623,7 @@ int SecondStageMain(int argc, char** argv) {

		boot_clock::time_point start_time = boot_clock::now();

		trigger_shutdown = [](const std::string& command) { shutdown_state.TriggerShutdown(command); };
		trigger_shutdown = TriggerShutdown;

		SetStdioToDevNull(argv);
		InitKernelLogging(argv);
		@@ -742,8 +683,11 @@ int SecondStageMain(int argc, char** argv) {
		}

		InstallSignalFdHandler(&epoll);
		InstallInitNotifier(&epoll);

		StartPropertyService(&property_fd);
		if (auto result = epoll.RegisterHandler(property_fd, HandlePropertyFd); !result.ok()) {
		LOG(FATAL) << "Could not register epoll handler for property fd: " << result.error();
		}

		// Make the time that init stages started available for bootstat to log.
		RecordStageBoottimes(start_time);
		@@ -796,7 +740,6 @@ int SecondStageMain(int argc, char** argv) {
		Keychords keychords;
		am.QueueBuiltinAction(
		[&epoll, &keychords](const BuiltinArguments& args) -> Result<void> {
		auto lock = std::lock_guard{service_lock};
		for (const auto& svc : ServiceList::GetInstance()) {
		keychords.Register(svc->keycodes());
		}
		@@ -827,12 +770,12 @@ int SecondStageMain(int argc, char** argv) {
		// By default, sleep until something happens.
		auto epoll_timeout = std::optional<std::chrono::milliseconds>{};

		auto shutdown_command = shutdown_state.CheckShutdown();
		if (shutdown_command) {
		HandlePowerctlMessage(*shutdown_command);
		if (do_shutdown && !IsShuttingDown()) {
		do_shutdown = false;
		HandlePowerctlMessage(shutdown_command);
		}

		if (!(prop_waiter_state.MightBeWaiting() \|\| Service::is_exec_service_running())) {
		if (!(waiting_for_prop \|\| Service::is_exec_service_running())) {
		am.ExecuteOneCommand();
		}
		if (!IsShuttingDown()) {
		@@ -846,7 +789,7 @@ int SecondStageMain(int argc, char** argv) {
		}
		}

		if (!(prop_waiter_state.MightBeWaiting() \|\| Service::is_exec_service_running())) {
		if (!(waiting_for_prop \|\| Service::is_exec_service_running())) {
		// If there's more work to do, wake up again immediately.
		if (am.HasMoreCommands()) epoll_timeout = 0ms;
		}