LogBuffer.h revision 758058ffd8820df71c27db7675c50a90a5fa02b4
1/* 2 * Copyright (C) 2012-2014 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#ifndef _LOGD_LOG_BUFFER_H__ 18#define _LOGD_LOG_BUFFER_H__ 19 20#include <sys/types.h> 21 22#include <list> 23#include <string> 24 25#include <log/log.h> 26#include <sysutils/SocketClient.h> 27 28#include <private/android_filesystem_config.h> 29 30#include "LogBufferElement.h" 31#include "LogTimes.h" 32#include "LogStatistics.h" 33#include "LogWhiteBlackList.h" 34 35typedef std::list<LogBufferElement *> LogBufferElementCollection; 36 37class LogBuffer { 38 LogBufferElementCollection mLogElements; 39 pthread_mutex_t mLogElementsLock; 40 41 LogStatistics stats; 42 43 PruneList mPrune; 44 // watermark of any worst/chatty uid processing 45 typedef std::unordered_map<uid_t, 46 LogBufferElementCollection::iterator> 47 LogBufferIteratorMap; 48 LogBufferIteratorMap mLastWorstUid[LOG_ID_MAX]; 49 50 unsigned long mMaxSize[LOG_ID_MAX]; 51 52public: 53 LastLogTimes &mTimes; 54 55 LogBuffer(LastLogTimes *times); 56 void init(); 57 58 int log(log_id_t log_id, log_time realtime, 59 uid_t uid, pid_t pid, pid_t tid, 60 const char *msg, unsigned short len); 61 uint64_t flushTo(SocketClient *writer, const uint64_t start, 62 bool privileged, 63 int (*filter)(const LogBufferElement *element, void *arg) = NULL, 64 void *arg = NULL); 65 66 void clear(log_id_t id, uid_t uid = AID_ROOT); 67 unsigned long getSize(log_id_t id); 68 int setSize(log_id_t id, unsigned long size); 69 unsigned long getSizeUsed(log_id_t id); 70 // *strp uses malloc, use free to release. 71 std::string formatStatistics(uid_t uid, unsigned int logMask); 72 73 void enableStatistics() { 74 stats.enableStatistics(); 75 } 76 77 int initPrune(const char *cp) { return mPrune.init(cp); } 78 std::string formatPrune() { return mPrune.format(); } 79 80 // helper must be protected directly or implicitly by lock()/unlock() 81 const char *pidToName(pid_t pid) { return stats.pidToName(pid); } 82 uid_t pidToUid(pid_t pid) { return stats.pidToUid(pid); } 83 const char *uidToName(uid_t uid) { return stats.uidToName(uid); } 84 void lock() { pthread_mutex_lock(&mLogElementsLock); } 85 void unlock() { pthread_mutex_unlock(&mLogElementsLock); } 86 87private: 88 void maybePrune(log_id_t id); 89 void prune(log_id_t id, unsigned long pruneRows, uid_t uid = AID_ROOT); 90 LogBufferElementCollection::iterator erase( 91 LogBufferElementCollection::iterator it, bool engageStats = true); 92}; 93 94#endif // _LOGD_LOG_BUFFER_H__ 95