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 #ifndef _LOGD_LOG_KLOG_H__
18 #define _LOGD_LOG_KLOG_H__
19 
20 #include <sysutils/SocketListener.h>
21 #include <log/log_read.h>
22 #include "LogReader.h"
23 
24 char *log_strtok_r(char *str, char **saveptr);
25 
26 class LogKlog : public SocketListener {
27     LogBuffer *logbuf;
28     LogReader *reader;
29     const log_time signature;
30     const int fdWrite; // /dev/kmsg
31     const int fdRead;  // /proc/kmsg
32     // Set once thread is started, separates KLOG_ACTION_READ_ALL
33     // and KLOG_ACTION_READ phases.
34     bool initialized;
35     // Used during each of the above phases to control logging.
36     bool enableLogging;
37     // set if we are also running auditd, to filter out audit reports from
38     // our copy of the kernel log
39     bool auditd;
40 
41     static log_time correction;
42 
43 public:
44     LogKlog(LogBuffer *buf, LogReader *reader, int fdWrite, int fdRead, bool auditd);
45     int log(const char *buf);
46     void synchronize(const char *buf);
47 
convertMonotonicToReal(log_time & real)48     static void convertMonotonicToReal(log_time &real) { real += correction; }
49 
50 protected:
51     void sniffTime(log_time &now, const char **buf, bool reverse);
52     void calculateCorrection(const log_time &monotonic, const char *real_string);
53     virtual bool onDataAvailable(SocketClient *cli);
54 
55 };
56 
57 #endif
58