LogBuffer.h revision 0175b0747a1f55329109e84c9a1322dcb95e2848 
1/*
2 * Copyright (C) 2012-2014 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_BUFFER_H__
18#define _LOGD_LOG_BUFFER_H__
19
20#include <sys/types.h>
21
22#include <log/log.h>
23#include <sysutils/SocketClient.h>
24#include <utils/List.h>
25
26#include "LogBufferElement.h"
27#include "LogTimes.h"
28
29typedef android::List<LogBufferElement *> LogBufferElementCollection;
30
31class LogBuffer {
32    LogBufferElementCollection mLogElements;
33    pthread_mutex_t mLogElementsLock;
34
35    unsigned long mSizes[LOG_ID_MAX];
36    unsigned long mElements[LOG_ID_MAX];
37
38public:
39    LastLogTimes &mTimes;
40
41    LogBuffer(LastLogTimes *times);
42
43    void log(log_id_t log_id, struct timespec realtime,
44             uid_t uid, pid_t pid, const char *msg, unsigned short len);
45    struct timespec flushTo(SocketClient *writer, const struct timespec start,
46                            bool privileged,
47                            bool (*filter)(const LogBufferElement *element, void *arg) = NULL,
48                            void *arg = NULL);
49
50    void clear(log_id_t id);
51    unsigned long getSize(log_id_t id);
52    unsigned long getSizeUsed(log_id_t id);
53
54private:
55    void maybePrune(log_id_t id);
56    void prune(log_id_t id, unsigned long pruneRows);
57
58};
59
60#endif
61