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_ELEMENT_H__ 18 #define _LOGD_LOG_BUFFER_ELEMENT_H__ 19 20 #include <stdatomic.h> 21 #include <stdlib.h> 22 #include <sys/types.h> 23 24 #include <sysutils/SocketClient.h> 25 #include <log/log.h> 26 #include <log/log_read.h> 27 28 class LogBuffer; 29 30 #define EXPIRE_HOUR_THRESHOLD 24 // Only expire chatty UID logs to preserve 31 // non-chatty UIDs less than this age in hours 32 #define EXPIRE_THRESHOLD 10 // A smaller expire count is considered too 33 // chatty for the temporal expire messages 34 #define EXPIRE_RATELIMIT 10 // maximum rate in seconds to report expiration 35 36 class LogBufferElement { 37 38 friend LogBuffer; 39 40 const log_id_t mLogId; 41 const uid_t mUid; 42 const pid_t mPid; 43 const pid_t mTid; 44 char *mMsg; 45 union { 46 const unsigned short mMsgLen; // mMSg != NULL 47 unsigned short mDropped; // mMsg == NULL 48 }; 49 const uint64_t mSequence; 50 log_time mRealTime; 51 static atomic_int_fast64_t sequence; 52 53 // assumption: mMsg == NULL 54 size_t populateDroppedMessage(char *&buffer, 55 LogBuffer *parent); 56 57 public: 58 LogBufferElement(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 virtual ~LogBufferElement(); 62 getLogId()63 log_id_t getLogId() const { return mLogId; } getUid(void)64 uid_t getUid(void) const { return mUid; } getPid(void)65 pid_t getPid(void) const { return mPid; } getTid(void)66 pid_t getTid(void) const { return mTid; } getDropped(void)67 unsigned short getDropped(void) const { return mMsg ? 0 : mDropped; } setDropped(unsigned short value)68 unsigned short setDropped(unsigned short value) { 69 if (mMsg) { 70 delete [] mMsg; 71 mMsg = NULL; 72 } 73 return mDropped = value; 74 } getMsgLen()75 unsigned short getMsgLen() const { return mMsg ? mMsgLen : 0; } getSequence(void)76 uint64_t getSequence(void) const { return mSequence; } getCurrentSequence(void)77 static uint64_t getCurrentSequence(void) { return sequence.load(memory_order_relaxed); } getRealTime(void)78 log_time getRealTime(void) const { return mRealTime; } 79 80 uint32_t getTag(void) const; 81 82 static const uint64_t FLUSH_ERROR; 83 uint64_t flushTo(SocketClient *writer, LogBuffer *parent, bool privileged); 84 }; 85 86 #endif 87