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      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 <private/android_filesystem_config.h>
     27 
     28 #include "LogBufferElement.h"
     29 #include "LogTimes.h"
     30 #include "LogStatistics.h"
     31 #include "LogWhiteBlackList.h"
     32 
     33 typedef android::List<LogBufferElement *> LogBufferElementCollection;
     34 
     35 class LogBuffer {
     36     LogBufferElementCollection mLogElements;
     37     pthread_mutex_t mLogElementsLock;
     38 
     39     LogStatistics stats;
     40 
     41     PruneList mPrune;
     42 
     43     unsigned long mMaxSize[LOG_ID_MAX];
     44 
     45 public:
     46     LastLogTimes &mTimes;
     47 
     48     LogBuffer(LastLogTimes *times);
     49     void init();
     50 
     51     int log(log_id_t log_id, log_time realtime,
     52             uid_t uid, pid_t pid, pid_t tid,
     53             const char *msg, unsigned short len);
     54     uint64_t flushTo(SocketClient *writer, const uint64_t start,
     55                      bool privileged,
     56                      int (*filter)(const LogBufferElement *element, void *arg) = NULL,
     57                      void *arg = NULL);
     58 
     59     void clear(log_id_t id, uid_t uid = AID_ROOT);
     60     unsigned long getSize(log_id_t id);
     61     int setSize(log_id_t id, unsigned long size);
     62     unsigned long getSizeUsed(log_id_t id);
     63     // *strp uses malloc, use free to release.
     64     void formatStatistics(char **strp, uid_t uid, unsigned int logMask);
     65 
     66     void enableStatistics() {
     67         stats.enableStatistics();
     68     }
     69 
     70     int initPrune(char *cp) { return mPrune.init(cp); }
     71     // *strp uses malloc, use free to release.
     72     void formatPrune(char **strp) { mPrune.format(strp); }
     73 
     74     // helper must be protected directly or implicitly by lock()/unlock()
     75     char *pidToName(pid_t pid) { return stats.pidToName(pid); }
     76     uid_t pidToUid(pid_t pid) { return stats.pidToUid(pid); }
     77     char *uidToName(uid_t uid) { return stats.uidToName(uid); }
     78     void lock() { pthread_mutex_lock(&mLogElementsLock); }
     79     void unlock() { pthread_mutex_unlock(&mLogElementsLock); }
     80 
     81 private:
     82     void maybePrune(log_id_t id);
     83     void prune(log_id_t id, unsigned long pruneRows, uid_t uid = AID_ROOT);
     84     LogBufferElementCollection::iterator erase(LogBufferElementCollection::iterator it);
     85 };
     86 
     87 #endif // _LOGD_LOG_BUFFER_H__
     88