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
23char *log_strntok_r(char *s, size_t *len, char **saveptr, size_t *sublen);
24
25class LogBuffer;
26class LogReader;
27
28class LogKlog : public SocketListener {
29    LogBuffer *logbuf;
30    LogReader *reader;
31    const log_time signature;
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
43public:
44    LogKlog(LogBuffer *buf, LogReader *reader, int fdWrite, int fdRead, bool auditd);
45    int log(const char *buf, size_t len);
46    void synchronize(const char *buf, size_t len);
47
48    bool isMonotonic() { return logbuf->isMonotonic(); }
49    static void convertMonotonicToReal(log_time &real) { real += correction; }
50    static void convertRealToMonotonic(log_time &real) { real -= correction; }
51
52protected:
53    void sniffTime(log_time &now, const char **buf, size_t len, bool reverse);
54    pid_t sniffPid(const char *buf, size_t len);
55    void calculateCorrection(const log_time &monotonic,
56                             const char *real_string, size_t len);
57    virtual bool onDataAvailable(SocketClient *cli);
58
59};
60
61#endif
62