cmds/dumpsys/dumpsys.cpp - LeafOS-Project/android_frameworks_native - Gitiles

 /*
  * Copyright (C) 2009 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.
  */

 #include <algorithm>
 #include <chrono>
 #include <iomanip>
 #include <thread>

 #include <android-base/file.h>
 #include <android-base/stringprintf.h>
 #include <android-base/unique_fd.h>
 #include <binder/Parcel.h>
 #include <binder/ProcessState.h>
 #include <binder/TextOutput.h>
 #include <serviceutils/PriorityDumper.h>
 #include <utils/Log.h>
 #include <utils/Vector.h>

 #include <fcntl.h>
 #include <getopt.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/poll.h>
 #include <sys/socket.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <unistd.h>

 #include "dumpsys.h"

 using namespace android;
 using ::android::base::StringAppendF;
 using ::android::base::StringPrintf;
 using ::android::base::unique_fd;
 using ::android::base::WriteFully;
 using ::android::base::WriteStringToFd;

 static int sort_func(const String16* lhs, const String16* rhs)
 {
     return lhs->compare(*rhs);
 }

 static void usage() {
     fprintf(stderr,
             "usage: dumpsys\n"
             "         To dump all services.\n"
             "or:\n"
             "       dumpsys [-t TIMEOUT] [--priority LEVEL] [--help | -l | --skip SERVICES | "
             "SERVICE [ARGS]]\n"
             "         --help: shows this help\n"
             "         -l: only list services, do not dump them\n"
             "         -t TIMEOUT_SEC: TIMEOUT to use in seconds instead of default 10 seconds\n"
             "         -T TIMEOUT_MS: TIMEOUT to use in milliseconds instead of default 10 seconds\n"
             "         --proto: filter services that support dumping data in proto format. Dumps"
             "               will be in proto format.\n"
             "         --priority LEVEL: filter services based on specified priority\n"
             "               LEVEL must be one of CRITICAL | HIGH | NORMAL\n"
             "         --skip SERVICES: dumps all services but SERVICES (comma-separated list)\n"
             "         SERVICE [ARGS]: dumps only service SERVICE, optionally passing ARGS to it\n");
 }

 static bool IsSkipped(const Vector<String16>& skipped, const String16& service) {
     for (const auto& candidate : skipped) {
         if (candidate == service) {
             return true;
         }
     }
     return false;
 }

 static bool ConvertPriorityTypeToBitmask(const String16& type, int& bitmask) {
     if (type == PriorityDumper::PRIORITY_ARG_CRITICAL) {
         bitmask = IServiceManager::DUMP_FLAG_PRIORITY_CRITICAL;
         return true;
     }
     if (type == PriorityDumper::PRIORITY_ARG_HIGH) {
         bitmask = IServiceManager::DUMP_FLAG_PRIORITY_HIGH;
         return true;
     }
     if (type == PriorityDumper::PRIORITY_ARG_NORMAL) {
         bitmask = IServiceManager::DUMP_FLAG_PRIORITY_NORMAL;
         return true;
     }
     return false;
 }

 String16 ConvertBitmaskToPriorityType(int bitmask) {
     if (bitmask == IServiceManager::DUMP_FLAG_PRIORITY_CRITICAL) {
         return String16(PriorityDumper::PRIORITY_ARG_CRITICAL);
     }
     if (bitmask == IServiceManager::DUMP_FLAG_PRIORITY_HIGH) {
         return String16(PriorityDumper::PRIORITY_ARG_HIGH);
     }
     if (bitmask == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL) {
         return String16(PriorityDumper::PRIORITY_ARG_NORMAL);
     }
     return String16("");
 }

 int Dumpsys::main(int argc, char* const argv[]) {
     Vector<String16> services;
     Vector<String16> args;
     String16 priorityType;
     Vector<String16> skippedServices;
     Vector<String16> protoServices;
     bool showListOnly = false;
     bool skipServices = false;
     bool asProto = false;
     int timeoutArgMs = 10000;
     int priorityFlags = IServiceManager::DUMP_FLAG_PRIORITY_ALL;
     static struct option longOptions[] = {{"priority", required_argument, 0, 0},
                                           {"proto", no_argument, 0, 0},
                                           {"skip", no_argument, 0, 0},
                                           {"help", no_argument, 0, 0},
                                           {0, 0, 0, 0}};

     // Must reset optind, otherwise subsequent calls will fail (wouldn't happen on main.cpp, but
     // happens on test cases).
     optind = 1;
     while (1) {
         int c;
         int optionIndex = 0;

         c = getopt_long(argc, argv, "+t:T:l", longOptions, &optionIndex);

         if (c == -1) {
             break;
         }

         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;
                 }
             }
             break;

         case 't':
             {
                 char* endptr;
                 timeoutArgMs = strtol(optarg, &endptr, 10);
                 timeoutArgMs = timeoutArgMs * 1000;
                 if (*endptr != '\0' || timeoutArgMs <= 0) {
                     fprintf(stderr, "Error: invalid timeout(seconds) number: '%s'\n", optarg);
                     return -1;
                 }
             }
             break;

         case 'T':
             {
                 char* endptr;
                 timeoutArgMs = strtol(optarg, &endptr, 10);
                 if (*endptr != '\0' || timeoutArgMs <= 0) {
                     fprintf(stderr, "Error: invalid timeout(milliseconds) number: '%s'\n", optarg);
                     return -1;
                 }
             }
             break;

         case 'l':
             showListOnly = true;
             break;

         default:
             fprintf(stderr, "\n");
             usage();
             return -1;
         }
     }

     for (int i = optind; i < argc; i++) {
         if (skipServices) {
             skippedServices.add(String16(argv[i]));
         } else {
             if (i == optind) {
                 services.add(String16(argv[i]));
             } else {
                 args.add(String16(argv[i]));
             }
         }
     }

     if ((skipServices && skippedServices.empty()) ||
             (showListOnly && (!services.empty() || !skippedServices.empty()))) {
         usage();
         return -1;
     }

     if (services.empty() || showListOnly) {
         services = listServices(priorityFlags, asProto);
         setServiceArgs(args, asProto, priorityFlags);
     }

     const size_t N = services.size();
     if (N > 1) {
         // first print a list of the current services
         aout << "Currently running services:" << endl;

         for (size_t i=0; i<N; i++) {
             sp<IBinder> service = sm_->checkService(services[i]);

             if (service != nullptr) {
                 bool skipped = IsSkipped(skippedServices, services[i]);
                 aout << "  " << services[i] << (skipped ? " (skipped)" : "") << endl;
             }
         }
     }

     if (showListOnly) {
         return 0;
     }

     for (size_t i = 0; i < N; i++) {
         const String16& serviceName = services[i];
         if (IsSkipped(skippedServices, serviceName)) continue;

         if (startDumpThread(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) {
                 aout << endl
                      << "*** SERVICE '" << serviceName << "' DUMP TIMEOUT (" << timeoutArgMs
                      << "ms) EXPIRED ***" << endl
                      << endl;
             }

             if (addSeparator) {
                 writeDumpFooter(STDOUT_FILENO, serviceName, elapsedDuration);
             }
             bool dumpComplete = (status == OK);
             stopDumpThread(dumpComplete);
         }
     }

     return 0;
 }

 Vector<String16> Dumpsys::listServices(int priorityFilterFlags, bool filterByProto) const {
     Vector<String16> services = sm_->listServices(priorityFilterFlags);
     services.sort(sort_func);
     if (filterByProto) {
         Vector<String16> protoServices = sm_->listServices(IServiceManager::DUMP_FLAG_PROTO);
         protoServices.sort(sort_func);
         Vector<String16> intersection;
         std::set_intersection(services.begin(), services.end(), protoServices.begin(),
                               protoServices.end(), std::back_inserter(intersection));
         services = std::move(intersection);
     }
     return services;
 }

 void Dumpsys::setServiceArgs(Vector<String16>& args, bool asProto, int priorityFlags) {
     // Add proto flag if dumping service as proto.
     if (asProto) {
         args.insertAt(String16(PriorityDumper::PROTO_ARG), 0);
     }

     // Add -a (dump all) flag if dumping all services, dumping normal services or
     // services not explicitly registered to a priority bucket (default services).
     if ((priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_ALL) ||
         (priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL) ||
         (priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_DEFAULT)) {
         args.insertAt(String16("-a"), 0);
     }

     // Add priority flags when dumping services registered to a specific priority bucket.
     if ((priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_CRITICAL) ||
         (priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_HIGH) ||
         (priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL)) {
         String16 priorityType = ConvertBitmaskToPriorityType(priorityFlags);
         args.insertAt(String16(PriorityDumper::PRIORITY_ARG), 0);
         args.insertAt(priorityType, 1);
     }
 }

 status_t Dumpsys::startDumpThread(const String16& serviceName, const Vector<String16>& args) {
     sp<IBinder> service = sm_->checkService(serviceName);
     if (service == nullptr) {
         aerr << "Can't find service: " << serviceName << endl;
         return NAME_NOT_FOUND;
     }

     int sfd[2];
     if (pipe(sfd) != 0) {
         aerr << "Failed to create pipe to dump service info for " << serviceName << ": "
              << strerror(errno) << 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 {
         int err = service->dump(remote_end.get(), args);

         // It'd be nice to be able to close the remote end of the socketpair before the dump
         // call returns, to terminate our reads if the other end closes their copy of the
         // file descriptor, but then hangs for some reason. There doesn't seem to be a good
         // way to do this, though.
         remote_end.reset();

         if (err != 0) {
             aerr << "Error dumping service info: (" << strerror(err) << ") "
                  << serviceName << endl;
         }
     });
     return OK;
 }

 void Dumpsys::stopDumpThread(bool dumpComplete) {
     if (dumpComplete) {
         activeThread_.join();
     } else {
         activeThread_.detach();
     }
     /* close read end of the dump output redirection pipe */
     redirectFd_.reset();
 }

 void Dumpsys::writeDumpHeader(int fd, const String16& serviceName, int priorityFlags) const {
     std::string msg(
         "----------------------------------------"
         "---------------------------------------\n");
     if (priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_ALL ||
         priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL ||
         priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_DEFAULT) {
         StringAppendF(&msg, "DUMP OF SERVICE %s:\n", String8(serviceName).c_str());
     } else {
         String16 priorityType = ConvertBitmaskToPriorityType(priorityFlags);
         StringAppendF(&msg, "DUMP OF SERVICE %s %s:\n", String8(priorityType).c_str(),
                       String8(serviceName).c_str());
     }
     WriteStringToFd(msg, fd);
 }

 status_t Dumpsys::writeDump(int fd, const String16& serviceName, std::chrono::milliseconds timeout,
                             bool asProto, std::chrono::duration<double>& elapsedDuration,
                             size_t& bytesWritten) const {
     status_t status = OK;
     size_t totalBytes = 0;
     auto start = std::chrono::steady_clock::now();
     auto end = start + timeout;

     int serviceDumpFd = redirectFd_.get();
     if (serviceDumpFd == -1) {
         return INVALID_OPERATION;
     }

     struct pollfd pfd = {.fd = serviceDumpFd, .events = POLLIN};

     while (true) {
         // Wrap this in a lambda so that TEMP_FAILURE_RETRY recalculates the timeout.
         auto time_left_ms = [end]() {
             auto now = std::chrono::steady_clock::now();
             auto diff = std::chrono::duration_cast<std::chrono::milliseconds>(end - now);
             return std::max(diff.count(), 0ll);
         };

         int rc = TEMP_FAILURE_RETRY(poll(&pfd, 1, time_left_ms()));
         if (rc < 0) {
             aerr << "Error in poll while dumping service " << serviceName << " : "
                  << strerror(errno) << endl;
             status = -errno;
             break;
         } else if (rc == 0) {
             status = TIMED_OUT;
             break;
         }

         char buf[4096];
         rc = TEMP_FAILURE_RETRY(read(redirectFd_.get(), buf, sizeof(buf)));
         if (rc < 0) {
             aerr << "Failed to read while dumping service " << serviceName << ": "
                  << strerror(errno) << endl;
             status = -errno;
             break;
         } else if (rc == 0) {
             // EOF.
             break;
         }

         if (!WriteFully(fd, buf, rc)) {
             aerr << "Failed to write while dumping service " << serviceName << ": "
                  << strerror(errno) << endl;
             status = -errno;
             break;
         }
         totalBytes += rc;
     }

     if ((status == TIMED_OUT) && (!asProto)) {
         std::string msg = StringPrintf("\n*** SERVICE '%s' DUMP TIMEOUT (%llums) EXPIRED ***\n\n",
                                        String8(serviceName).string(), timeout.count());
         WriteStringToFd(msg, fd);
     }

     elapsedDuration = std::chrono::steady_clock::now() - start;
     bytesWritten = totalBytes;
     return status;
 }

 void Dumpsys::writeDumpFooter(int fd, const String16& serviceName,
                               const std::chrono::duration<double>& elapsedDuration) const {
     using std::chrono::system_clock;
     const auto finish = system_clock::to_time_t(system_clock::now());
     std::tm finish_tm;
     localtime_r(&finish, &finish_tm);
     std::stringstream oss;
     oss << std::put_time(&finish_tm, "%Y-%m-%d %H:%M:%S");
     std::string msg =
         StringPrintf("--------- %.3fs was the duration of dumpsys %s, ending at: %s\n",
                      elapsedDuration.count(), String8(serviceName).string(), oss.str().c_str());
     WriteStringToFd(msg, fd);
 }
	/*
	* Copyright (C) 2009 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.
	*/

	#include <algorithm>
	#include <chrono>
	#include <iomanip>
	#include <thread>

	#include <android-base/file.h>
	#include <android-base/stringprintf.h>
	#include <android-base/unique_fd.h>
	#include <binder/Parcel.h>
	#include <binder/ProcessState.h>
	#include <binder/TextOutput.h>
	#include <serviceutils/PriorityDumper.h>
	#include <utils/Log.h>
	#include <utils/Vector.h>

	#include <fcntl.h>
	#include <getopt.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <sys/poll.h>
	#include <sys/socket.h>
	#include <sys/time.h>
	#include <sys/types.h>
	#include <unistd.h>

	#include "dumpsys.h"

	using namespace android;
	using ::android::base::StringAppendF;
	using ::android::base::StringPrintf;
	using ::android::base::unique_fd;
	using ::android::base::WriteFully;
	using ::android::base::WriteStringToFd;

	static int sort_func(const String16* lhs, const String16* rhs)
	{
	return lhs->compare(*rhs);
	}

	static void usage() {
	fprintf(stderr,
	"usage: dumpsys\n"
	" To dump all services.\n"
	"or:\n"
	" dumpsys [-t TIMEOUT] [--priority LEVEL] [--help \| -l \| --skip SERVICES \| "
	"SERVICE [ARGS]]\n"
	" --help: shows this help\n"
	" -l: only list services, do not dump them\n"
	" -t TIMEOUT_SEC: TIMEOUT to use in seconds instead of default 10 seconds\n"
	" -T TIMEOUT_MS: TIMEOUT to use in milliseconds instead of default 10 seconds\n"
	" --proto: filter services that support dumping data in proto format. Dumps"
	" will be in proto format.\n"
	" --priority LEVEL: filter services based on specified priority\n"
	" LEVEL must be one of CRITICAL \| HIGH \| NORMAL\n"
	" --skip SERVICES: dumps all services but SERVICES (comma-separated list)\n"
	" SERVICE [ARGS]: dumps only service SERVICE, optionally passing ARGS to it\n");
	}

	static bool IsSkipped(const Vector<String16>& skipped, const String16& service) {
	for (const auto& candidate : skipped) {
	if (candidate == service) {
	return true;
	}
	}
	return false;
	}

	static bool ConvertPriorityTypeToBitmask(const String16& type, int& bitmask) {
	if (type == PriorityDumper::PRIORITY_ARG_CRITICAL) {
	bitmask = IServiceManager::DUMP_FLAG_PRIORITY_CRITICAL;
	return true;
	}
	if (type == PriorityDumper::PRIORITY_ARG_HIGH) {
	bitmask = IServiceManager::DUMP_FLAG_PRIORITY_HIGH;
	return true;
	}
	if (type == PriorityDumper::PRIORITY_ARG_NORMAL) {
	bitmask = IServiceManager::DUMP_FLAG_PRIORITY_NORMAL;
	return true;
	}
	return false;
	}

	String16 ConvertBitmaskToPriorityType(int bitmask) {
	if (bitmask == IServiceManager::DUMP_FLAG_PRIORITY_CRITICAL) {
	return String16(PriorityDumper::PRIORITY_ARG_CRITICAL);
	}
	if (bitmask == IServiceManager::DUMP_FLAG_PRIORITY_HIGH) {
	return String16(PriorityDumper::PRIORITY_ARG_HIGH);
	}
	if (bitmask == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL) {
	return String16(PriorityDumper::PRIORITY_ARG_NORMAL);
	}
	return String16("");
	}

	int Dumpsys::main(int argc, char* const argv[]) {
	Vector<String16> services;
	Vector<String16> args;
	String16 priorityType;
	Vector<String16> skippedServices;
	Vector<String16> protoServices;
	bool showListOnly = false;
	bool skipServices = false;
	bool asProto = false;
	int timeoutArgMs = 10000;
	int priorityFlags = IServiceManager::DUMP_FLAG_PRIORITY_ALL;
	static struct option longOptions[] = {{"priority", required_argument, 0, 0},
	{"proto", no_argument, 0, 0},
	{"skip", no_argument, 0, 0},
	{"help", no_argument, 0, 0},
	{0, 0, 0, 0}};

	// Must reset optind, otherwise subsequent calls will fail (wouldn't happen on main.cpp, but
	// happens on test cases).
	optind = 1;
	while (1) {
	int c;
	int optionIndex = 0;

	c = getopt_long(argc, argv, "+t:T:l", longOptions, &optionIndex);

	if (c == -1) {
	break;
	}

	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;
	}
	}
	break;

	case 't':
	{
	char* endptr;
	timeoutArgMs = strtol(optarg, &endptr, 10);
	timeoutArgMs = timeoutArgMs * 1000;
	if (*endptr != '\0' \|\| timeoutArgMs <= 0) {
	fprintf(stderr, "Error: invalid timeout(seconds) number: '%s'\n", optarg);
	return -1;
	}
	}
	break;

	case 'T':
	{
	char* endptr;
	timeoutArgMs = strtol(optarg, &endptr, 10);
	if (*endptr != '\0' \|\| timeoutArgMs <= 0) {
	fprintf(stderr, "Error: invalid timeout(milliseconds) number: '%s'\n", optarg);
	return -1;
	}
	}
	break;

	case 'l':
	showListOnly = true;
	break;

	default:
	fprintf(stderr, "\n");
	usage();
	return -1;
	}
	}

	for (int i = optind; i < argc; i++) {
	if (skipServices) {
	skippedServices.add(String16(argv[i]));
	} else {
	if (i == optind) {
	services.add(String16(argv[i]));
	} else {
	args.add(String16(argv[i]));
	}
	}
	}

	if ((skipServices && skippedServices.empty()) \|\|
	(showListOnly && (!services.empty() \|\| !skippedServices.empty()))) {
	usage();
	return -1;
	}

	if (services.empty() \|\| showListOnly) {
	services = listServices(priorityFlags, asProto);
	setServiceArgs(args, asProto, priorityFlags);
	}

	const size_t N = services.size();
	if (N > 1) {
	// first print a list of the current services
	aout << "Currently running services:" << endl;

	for (size_t i=0; i<N; i++) {
	sp<IBinder> service = sm_->checkService(services[i]);

	if (service != nullptr) {
	bool skipped = IsSkipped(skippedServices, services[i]);
	aout << " " << services[i] << (skipped ? " (skipped)" : "") << endl;
	}
	}
	}

	if (showListOnly) {
	return 0;
	}

	for (size_t i = 0; i < N; i++) {
	const String16& serviceName = services[i];
	if (IsSkipped(skippedServices, serviceName)) continue;

	if (startDumpThread(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) {
	aout << endl
	<< "*** SERVICE '" << serviceName << "' DUMP TIMEOUT (" << timeoutArgMs
	<< "ms) EXPIRED ***" << endl
	<< endl;
	}

	if (addSeparator) {
	writeDumpFooter(STDOUT_FILENO, serviceName, elapsedDuration);
	}
	bool dumpComplete = (status == OK);
	stopDumpThread(dumpComplete);
	}
	}

	return 0;
	}

	Vector<String16> Dumpsys::listServices(int priorityFilterFlags, bool filterByProto) const {
	Vector<String16> services = sm_->listServices(priorityFilterFlags);
	services.sort(sort_func);
	if (filterByProto) {
	Vector<String16> protoServices = sm_->listServices(IServiceManager::DUMP_FLAG_PROTO);
	protoServices.sort(sort_func);
	Vector<String16> intersection;
	std::set_intersection(services.begin(), services.end(), protoServices.begin(),
	protoServices.end(), std::back_inserter(intersection));
	services = std::move(intersection);
	}
	return services;
	}

	void Dumpsys::setServiceArgs(Vector<String16>& args, bool asProto, int priorityFlags) {
	// Add proto flag if dumping service as proto.
	if (asProto) {
	args.insertAt(String16(PriorityDumper::PROTO_ARG), 0);
	}

	// Add -a (dump all) flag if dumping all services, dumping normal services or
	// services not explicitly registered to a priority bucket (default services).
	if ((priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_ALL) \|\|
	(priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL) \|\|
	(priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_DEFAULT)) {
	args.insertAt(String16("-a"), 0);
	}

	// Add priority flags when dumping services registered to a specific priority bucket.
	if ((priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_CRITICAL) \|\|
	(priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_HIGH) \|\|
	(priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL)) {
	String16 priorityType = ConvertBitmaskToPriorityType(priorityFlags);
	args.insertAt(String16(PriorityDumper::PRIORITY_ARG), 0);
	args.insertAt(priorityType, 1);
	}
	}

	status_t Dumpsys::startDumpThread(const String16& serviceName, const Vector<String16>& args) {
	sp<IBinder> service = sm_->checkService(serviceName);
	if (service == nullptr) {
	aerr << "Can't find service: " << serviceName << endl;
	return NAME_NOT_FOUND;
	}

	int sfd[2];
	if (pipe(sfd) != 0) {
	aerr << "Failed to create pipe to dump service info for " << serviceName << ": "
	<< strerror(errno) << 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 {
	int err = service->dump(remote_end.get(), args);

	// It'd be nice to be able to close the remote end of the socketpair before the dump
	// call returns, to terminate our reads if the other end closes their copy of the
	// file descriptor, but then hangs for some reason. There doesn't seem to be a good
	// way to do this, though.
	remote_end.reset();

	if (err != 0) {
	aerr << "Error dumping service info: (" << strerror(err) << ") "
	<< serviceName << endl;
	}
	});
	return OK;
	}

	void Dumpsys::stopDumpThread(bool dumpComplete) {
	if (dumpComplete) {
	activeThread_.join();
	} else {
	activeThread_.detach();
	}
	/* close read end of the dump output redirection pipe */
	redirectFd_.reset();
	}

	void Dumpsys::writeDumpHeader(int fd, const String16& serviceName, int priorityFlags) const {
	std::string msg(
	"----------------------------------------"
	"---------------------------------------\n");
	if (priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_ALL \|\|
	priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_NORMAL \|\|
	priorityFlags == IServiceManager::DUMP_FLAG_PRIORITY_DEFAULT) {
	StringAppendF(&msg, "DUMP OF SERVICE %s:\n", String8(serviceName).c_str());
	} else {
	String16 priorityType = ConvertBitmaskToPriorityType(priorityFlags);
	StringAppendF(&msg, "DUMP OF SERVICE %s %s:\n", String8(priorityType).c_str(),
	String8(serviceName).c_str());
	}
	WriteStringToFd(msg, fd);
	}

	status_t Dumpsys::writeDump(int fd, const String16& serviceName, std::chrono::milliseconds timeout,
	bool asProto, std::chrono::duration<double>& elapsedDuration,
	size_t& bytesWritten) const {
	status_t status = OK;
	size_t totalBytes = 0;
	auto start = std::chrono::steady_clock::now();
	auto end = start + timeout;

	int serviceDumpFd = redirectFd_.get();
	if (serviceDumpFd == -1) {
	return INVALID_OPERATION;
	}

	struct pollfd pfd = {.fd = serviceDumpFd, .events = POLLIN};

	while (true) {
	// Wrap this in a lambda so that TEMP_FAILURE_RETRY recalculates the timeout.
	auto time_left_ms = [end]() {
	auto now = std::chrono::steady_clock::now();
	auto diff = std::chrono::duration_cast<std::chrono::milliseconds>(end - now);
	return std::max(diff.count(), 0ll);
	};

	int rc = TEMP_FAILURE_RETRY(poll(&pfd, 1, time_left_ms()));
	if (rc < 0) {
	aerr << "Error in poll while dumping service " << serviceName << " : "
	<< strerror(errno) << endl;
	status = -errno;
	break;
	} else if (rc == 0) {
	status = TIMED_OUT;
	break;
	}

	char buf[4096];
	rc = TEMP_FAILURE_RETRY(read(redirectFd_.get(), buf, sizeof(buf)));
	if (rc < 0) {
	aerr << "Failed to read while dumping service " << serviceName << ": "
	<< strerror(errno) << endl;
	status = -errno;
	break;
	} else if (rc == 0) {
	// EOF.
	break;
	}

	if (!WriteFully(fd, buf, rc)) {
	aerr << "Failed to write while dumping service " << serviceName << ": "
	<< strerror(errno) << endl;
	status = -errno;
	break;
	}
	totalBytes += rc;
	}

	if ((status == TIMED_OUT) && (!asProto)) {
	std::string msg = StringPrintf("\n* SERVICE '%s' DUMP TIMEOUT (%llums) EXPIRED *\n\n",
	String8(serviceName).string(), timeout.count());
	WriteStringToFd(msg, fd);
	}

	elapsedDuration = std::chrono::steady_clock::now() - start;
	bytesWritten = totalBytes;
	return status;
	}

	void Dumpsys::writeDumpFooter(int fd, const String16& serviceName,
	const std::chrono::duration<double>& elapsedDuration) const {
	using std::chrono::system_clock;
	const auto finish = system_clock::to_time_t(system_clock::now());
	std::tm finish_tm;
	localtime_r(&finish, &finish_tm);
	std::stringstream oss;
	oss << std::put_time(&finish_tm, "%Y-%m-%d %H:%M:%S");
	std::string msg =
	StringPrintf("--------- %.3fs was the duration of dumpsys %s, ending at: %s\n",
	elapsedDuration.count(), String8(serviceName).string(), oss.str().c_str());
	WriteStringToFd(msg, fd);
	}