149 lines
4.8 KiB
C++
149 lines
4.8 KiB
C++
/*
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* Copyright (C) 2013 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#define LOG_TAG "MediaLog"
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//#define LOG_NDEBUG 0
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#include <sys/mman.h>
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#include <utils/Log.h>
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#include <binder/PermissionCache.h>
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#include <media/nbaio/NBLog.h>
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#include <private/android_filesystem_config.h>
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#include "MediaLogService.h"
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namespace android {
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static const char kDeadlockedString[] = "MediaLogService may be deadlocked\n";
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MediaLogService::MediaLogService() :
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BnMediaLogService(),
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mMergerShared((NBLog::Shared*) malloc(NBLog::Timeline::sharedSize(kMergeBufferSize))),
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mMerger(mMergerShared, kMergeBufferSize),
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mMergeReader(mMergerShared, kMergeBufferSize, mMerger),
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mMergeThread(new NBLog::MergeThread(mMerger))
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{
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mMergeThread->run("MergeThread");
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}
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MediaLogService::~MediaLogService()
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{
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mMergeThread->requestExit();
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mMergeThread->setTimeoutUs(0);
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mMergeThread->join();
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free(mMergerShared);
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}
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void MediaLogService::registerWriter(const sp<IMemory>& shared, size_t size, const char *name)
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{
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if (IPCThreadState::self()->getCallingUid() != AID_AUDIOSERVER || shared == 0 ||
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size < kMinSize || size > kMaxSize || name == NULL ||
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shared->size() < NBLog::Timeline::sharedSize(size)) {
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return;
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}
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sp<NBLog::Reader> reader(new NBLog::Reader(shared, size));
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NBLog::NamedReader namedReader(reader, name);
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Mutex::Autolock _l(mLock);
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mNamedReaders.add(namedReader);
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mMerger.addReader(namedReader);
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}
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void MediaLogService::unregisterWriter(const sp<IMemory>& shared)
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{
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if (IPCThreadState::self()->getCallingUid() != AID_AUDIOSERVER || shared == 0) {
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return;
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}
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Mutex::Autolock _l(mLock);
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for (size_t i = 0; i < mNamedReaders.size(); ) {
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if (mNamedReaders[i].reader()->isIMemory(shared)) {
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mNamedReaders.removeAt(i);
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} else {
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i++;
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}
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}
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}
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bool MediaLogService::dumpTryLock(Mutex& mutex)
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{
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bool locked = false;
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for (int i = 0; i < kDumpLockRetries; ++i) {
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if (mutex.tryLock() == NO_ERROR) {
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locked = true;
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break;
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}
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usleep(kDumpLockSleepUs);
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}
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return locked;
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}
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status_t MediaLogService::dump(int fd, const Vector<String16>& args __unused)
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{
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// FIXME merge with similar but not identical code at services/audioflinger/ServiceUtilities.cpp
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static const String16 sDump("android.permission.DUMP");
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if (!(IPCThreadState::self()->getCallingUid() == AID_AUDIOSERVER ||
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PermissionCache::checkCallingPermission(sDump))) {
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dprintf(fd, "Permission Denial: can't dump media.log from pid=%d, uid=%d\n",
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IPCThreadState::self()->getCallingPid(),
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IPCThreadState::self()->getCallingUid());
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return NO_ERROR;
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}
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if (args.size() > 0) {
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const String8 arg0(args[0]);
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if (!strcmp(arg0.string(), "-r")) {
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// needed because mNamedReaders is protected by mLock
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bool locked = dumpTryLock(mLock);
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// failed to lock - MediaLogService is probably deadlocked
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if (!locked) {
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String8 result(kDeadlockedString);
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if (fd >= 0) {
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write(fd, result.string(), result.size());
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} else {
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ALOGW("%s:", result.string());
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}
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// TODO should we instead proceed to mMergeReader.dump? does it need lock?
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return NO_ERROR;
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}
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for (const auto& namedReader : mNamedReaders) {
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if (fd >= 0) {
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dprintf(fd, "\n%s:\n", namedReader.name());
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} else {
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ALOGI("%s:", namedReader.name());
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}
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// TODO This code is for testing, remove it when done
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// namedReader.reader()->dump(fd, 0 /*indent*/);
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}
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mLock.unlock();
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}
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}
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// FIXME request merge to make sure log is up to date
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mMergeReader.dump(fd);
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return NO_ERROR;
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}
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status_t MediaLogService::onTransact(uint32_t code, const Parcel& data, Parcel* reply,
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uint32_t flags)
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{
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return BnMediaLogService::onTransact(code, data, reply, flags);
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}
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void MediaLogService::requestMergeWakeup() {
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mMergeThread->wakeup();
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}
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} // namespace android
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