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 <private/android_logger.h>
21 #include <sysutils/SocketListener.h>
22 
23 class LogBuffer;
24 class LogReader;
25 
26 class LogKlog : public SocketListener {
27     LogBuffer* logbuf;
28     LogReader* reader;
29     const log_time signature;
30     // Set once thread is started, separates KLOG_ACTION_READ_ALL
31     // and KLOG_ACTION_READ phases.
32     bool initialized;
33     // Used during each of the above phases to control logging.
34     bool enableLogging;
35     // set if we are also running auditd, to filter out audit reports from
36     // our copy of the kernel log
37     bool auditd;
38 
39     static log_time correction;
40 
41    public:
42     LogKlog(LogBuffer* buf, LogReader* reader, int fdWrite, int fdRead,
43             bool auditd);
44     int log(const char* buf, ssize_t len);
45     void synchronize(const char* buf, ssize_t len);
46 
isMonotonic()47     bool isMonotonic() {
48         return logbuf->isMonotonic();
49     }
convertMonotonicToReal(log_time & real)50     static void convertMonotonicToReal(log_time& real) {
51         real += correction;
52     }
convertRealToMonotonic(log_time & real)53     static void convertRealToMonotonic(log_time& real) {
54         real -= correction;
55     }
56 
57    protected:
58     void sniffTime(log_time& now, const char*& buf, ssize_t len, bool reverse);
59     pid_t sniffPid(const char*& buf, ssize_t len);
60     void calculateCorrection(const log_time& monotonic, const char* real_string,
61                              ssize_t len);
62     virtual bool onDataAvailable(SocketClient* cli);
63 };
64 
65 #endif
66