1 /* 2 * Copyright (C) 2020 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 #pragma once 18 19 #include <stdint.h> 20 #include <stdlib.h> 21 #include <sys/types.h> 22 23 #include <log/log.h> 24 #include <log/log_read.h> 25 26 #include "LogStatistics.h" 27 #include "LogWriter.h" 28 29 // These structs are packed into a single chunk of memory for each log type within a 30 // SerializedLogChunk object. Their message is contained immediately at the end of the struct. The 31 // address of the next log in the buffer is *this + sizeof(SerializedLogEntry) + msg_len_. If that 32 // value would overflow the chunk of memory associated with the SerializedLogChunk object, then a 33 // new SerializedLogChunk must be allocated to contain the next SerializedLogEntry. 34 class __attribute__((packed)) SerializedLogEntry { 35 public: SerializedLogEntry(uid_t uid,pid_t pid,pid_t tid,uint64_t sequence,log_time realtime,uint16_t len)36 SerializedLogEntry(uid_t uid, pid_t pid, pid_t tid, uint64_t sequence, log_time realtime, 37 uint16_t len) 38 : uid_(uid), 39 pid_(pid), 40 tid_(tid), 41 sequence_(sequence), 42 realtime_(realtime), 43 msg_len_(len) {} 44 SerializedLogEntry(const SerializedLogEntry& elem) = delete; 45 SerializedLogEntry& operator=(const SerializedLogEntry& elem) = delete; ~SerializedLogEntry()46 ~SerializedLogEntry() { 47 // Never place anything in this destructor. This class is in place constructed and never 48 // destructed. 49 } 50 ToLogStatisticsElement(log_id_t log_id)51 LogStatisticsElement ToLogStatisticsElement(log_id_t log_id) const { 52 return LogStatisticsElement{ 53 .uid = uid(), 54 .pid = pid(), 55 .tid = tid(), 56 .tag = IsBinary(log_id) ? MsgToTag(msg(), msg_len()) : 0, 57 .realtime = realtime(), 58 .msg = msg(), 59 .msg_len = msg_len(), 60 .log_id = log_id, 61 .total_len = total_len(), 62 }; 63 } 64 Flush(LogWriter * writer,log_id_t log_id)65 bool Flush(LogWriter* writer, log_id_t log_id) const { 66 struct logger_entry entry = {}; 67 68 entry.hdr_size = sizeof(struct logger_entry); 69 entry.lid = log_id; 70 entry.pid = pid(); 71 entry.tid = tid(); 72 entry.uid = uid(); 73 entry.sec = realtime().tv_sec; 74 entry.nsec = realtime().tv_nsec; 75 entry.len = msg_len(); 76 77 return writer->Write(entry, msg()); 78 } 79 uid()80 uid_t uid() const { return uid_; } pid()81 pid_t pid() const { return pid_; } tid()82 pid_t tid() const { return tid_; } msg_len()83 uint16_t msg_len() const { return msg_len_; } sequence()84 uint64_t sequence() const { return sequence_; } realtime()85 log_time realtime() const { return realtime_; } 86 msg()87 char* msg() { return reinterpret_cast<char*>(this) + sizeof(*this); } msg()88 const char* msg() const { return reinterpret_cast<const char*>(this) + sizeof(*this); } total_len()89 uint16_t total_len() const { return sizeof(*this) + msg_len_; } 90 91 private: 92 const uint32_t uid_; 93 const uint32_t pid_; 94 const uint32_t tid_; 95 const uint64_t sequence_; 96 const log_time realtime_; 97 const uint16_t msg_len_; 98 }; 99