1/* 2 * Copyright (C) 2013 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define LOG_TAG "MediaLog" 18//#define LOG_NDEBUG 0 19 20#include <sys/mman.h> 21#include <utils/Log.h> 22#include <binder/PermissionCache.h> 23#include <media/nbaio/NBLog.h> 24#include <private/android_filesystem_config.h> 25#include "MediaLogService.h" 26 27namespace android { 28 29// static const char kDeadlockedString[] = "MediaLogService may be deadlocked\n"; 30MediaLogService::MediaLogService() : 31 BnMediaLogService(), 32 mMergerShared((NBLog::Shared*) malloc(NBLog::Timeline::sharedSize(kMergeBufferSize))), 33 mMerger(mMergerShared, kMergeBufferSize), 34 mMergeReader(mMergerShared, kMergeBufferSize, mMerger), 35 mMergeThread(new NBLog::MergeThread(mMerger)) 36{ 37 mMergeThread->run("MergeThread"); 38} 39 40MediaLogService::~MediaLogService() 41{ 42 mMergeThread->requestExit(); 43 mMergeThread->setTimeoutUs(0); 44 mMergeThread->join(); 45 free(mMergerShared); 46} 47 48void MediaLogService::registerWriter(const sp<IMemory>& shared, size_t size, const char *name) 49{ 50 if (IPCThreadState::self()->getCallingUid() != AID_AUDIOSERVER || shared == 0 || 51 size < kMinSize || size > kMaxSize || name == NULL || 52 shared->size() < NBLog::Timeline::sharedSize(size)) { 53 return; 54 } 55 sp<NBLog::Reader> reader(new NBLog::Reader(shared, size)); 56 NBLog::NamedReader namedReader(reader, name); 57 Mutex::Autolock _l(mLock); 58 mNamedReaders.add(namedReader); 59 mMerger.addReader(namedReader); 60} 61 62void MediaLogService::unregisterWriter(const sp<IMemory>& shared) 63{ 64 if (IPCThreadState::self()->getCallingUid() != AID_AUDIOSERVER || shared == 0) { 65 return; 66 } 67 Mutex::Autolock _l(mLock); 68 for (size_t i = 0; i < mNamedReaders.size(); ) { 69 if (mNamedReaders[i].reader()->isIMemory(shared)) { 70 mNamedReaders.removeAt(i); 71 } else { 72 i++; 73 } 74 } 75} 76 77bool MediaLogService::dumpTryLock(Mutex& mutex) 78{ 79 bool locked = false; 80 for (int i = 0; i < kDumpLockRetries; ++i) { 81 if (mutex.tryLock() == NO_ERROR) { 82 locked = true; 83 break; 84 } 85 usleep(kDumpLockSleepUs); 86 } 87 return locked; 88} 89 90status_t MediaLogService::dump(int fd, const Vector<String16>& args __unused) 91{ 92 // FIXME merge with similar but not identical code at services/audioflinger/ServiceUtilities.cpp 93 static const String16 sDump("android.permission.DUMP"); 94 if (!(IPCThreadState::self()->getCallingUid() == AID_AUDIOSERVER || 95 PermissionCache::checkCallingPermission(sDump))) { 96 dprintf(fd, "Permission Denial: can't dump media.log from pid=%d, uid=%d\n", 97 IPCThreadState::self()->getCallingPid(), 98 IPCThreadState::self()->getCallingUid()); 99 return NO_ERROR; 100 } 101 102#if 0 103 Vector<NBLog::NamedReader> namedReaders; 104 { 105 bool locked = dumpTryLock(mLock); 106 107 // failed to lock - MediaLogService is probably deadlocked 108 if (!locked) { 109 String8 result(kDeadlockedString); 110 if (fd >= 0) { 111 write(fd, result.string(), result.size()); 112 } else { 113 ALOGW("%s:", result.string()); 114 } 115 return NO_ERROR; 116 } 117 // namedReaders = mNamedReaders; 118 // for (size_t i = 0; i < namedReaders.size(); i++) { 119 // const NBLog::NamedReader& namedReader = namedReaders[i]; 120 // if (fd >= 0) { 121 // dprintf(fd, "\n%s:\n", namedReader.name()); 122 // } else { 123 // ALOGI("%s:", namedReader.name()); 124 // } 125 // namedReader.reader()->dump(fd, 0 /*indent*/); 126 // } 127 128 mLock.unlock(); 129 } 130#endif 131 // FIXME request merge to make sure log is up to date 132 mMergeReader.dump(fd); 133 return NO_ERROR; 134} 135 136status_t MediaLogService::onTransact(uint32_t code, const Parcel& data, Parcel* reply, 137 uint32_t flags) 138{ 139 return BnMediaLogService::onTransact(code, data, reply, flags); 140} 141 142void MediaLogService::requestMergeWakeup() { 143 mMergeThread->wakeup(); 144} 145 146} // namespace android 147