1 /*
2  * Copyright (C) 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 #pragma once
18 
19 #include <private/android_logger.h>
20 #include <sysutils/SocketListener.h>
21 
22 #include "LogBuffer.h"
23 #include "LogStatistics.h"
24 
25 class LogKlog : public SocketListener {
26     LogBuffer* logbuf;
27     const log_time signature;
28     // Set once thread is started, separates KLOG_ACTION_READ_ALL
29     // and KLOG_ACTION_READ phases.
30     bool initialized;
31     // set if we are also running auditd, to filter out audit reports from
32     // our copy of the kernel log
33     bool auditd;
34 
35     static log_time correction;
36 
37   public:
38     LogKlog(LogBuffer* buf, int fdWrite, int fdRead, bool auditd, LogStatistics* stats);
39     int log(const char* buf, ssize_t len);
40 
convertMonotonicToReal(log_time & real)41     static void convertMonotonicToReal(log_time& real) { real += correction; }
42 
43   protected:
44     log_time sniffTime(const char*& buf, ssize_t len, bool reverse);
45     pid_t sniffPid(const char*& buf, ssize_t len);
46     void calculateCorrection(const log_time& monotonic, const char* real_string, ssize_t len);
47     virtual bool onDataAvailable(SocketClient* cli);
48 
49   private:
50     LogStatistics* stats_;
51 };
52