151 lines
4.7 KiB
C++
151 lines
4.7 KiB
C++
/*
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* Copyright (C) 2012-2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef _LOGD_LOG_BUFFER_H__
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#define _LOGD_LOG_BUFFER_H__
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#include <sys/types.h>
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#include <list>
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#include <string>
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#include <log/log.h>
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#include <sysutils/SocketClient.h>
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#include <private/android_filesystem_config.h>
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#include "LogBufferElement.h"
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#include "LogTimes.h"
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#include "LogStatistics.h"
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#include "LogWhiteBlackList.h"
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//
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// We are either in 1970ish (MONOTONIC) or 2016+ish (REALTIME) so to
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// differentiate without prejudice, we use 1972 to delineate, earlier
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// is likely monotonic, later is real. Otherwise we start using a
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// dividing line between monotonic and realtime if more than a minute
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// difference between them.
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//
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namespace android {
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static bool isMonotonic(const log_time &mono) {
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static const uint32_t EPOCH_PLUS_2_YEARS = 2 * 24 * 60 * 60 * 1461 / 4;
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static const uint32_t EPOCH_PLUS_MINUTE = 60;
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if (mono.tv_sec >= EPOCH_PLUS_2_YEARS) {
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return false;
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}
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log_time now(CLOCK_REALTIME);
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/* Timezone and ntp time setup? */
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if (now.tv_sec >= EPOCH_PLUS_2_YEARS) {
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return true;
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}
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/* no way to differentiate realtime from monotonic time */
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if (now.tv_sec < EPOCH_PLUS_MINUTE) {
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return false;
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}
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log_time cpu(CLOCK_MONOTONIC);
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/* too close to call to differentiate monotonic times from realtime */
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if ((cpu.tv_sec + EPOCH_PLUS_MINUTE) >= now.tv_sec) {
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return false;
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}
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/* dividing line half way between monotonic and realtime */
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return mono.tv_sec < ((cpu.tv_sec + now.tv_sec) / 2);
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}
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}
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typedef std::list<LogBufferElement *> LogBufferElementCollection;
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class LogBuffer {
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LogBufferElementCollection mLogElements;
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pthread_mutex_t mLogElementsLock;
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LogStatistics stats;
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PruneList mPrune;
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// watermark for last per log id
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LogBufferElementCollection::iterator mLast[LOG_ID_MAX];
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bool mLastSet[LOG_ID_MAX];
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// watermark of any worst/chatty uid processing
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typedef std::unordered_map<uid_t,
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LogBufferElementCollection::iterator>
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LogBufferIteratorMap;
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LogBufferIteratorMap mLastWorst[LOG_ID_MAX];
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// watermark of any worst/chatty pid of system processing
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typedef std::unordered_map<pid_t,
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LogBufferElementCollection::iterator>
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LogBufferPidIteratorMap;
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LogBufferPidIteratorMap mLastWorstPidOfSystem[LOG_ID_MAX];
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unsigned long mMaxSize[LOG_ID_MAX];
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bool monotonic;
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public:
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LastLogTimes &mTimes;
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LogBuffer(LastLogTimes *times);
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void init();
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bool isMonotonic() { return monotonic; }
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int log(log_id_t log_id, log_time realtime,
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uid_t uid, pid_t pid, pid_t tid,
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const char *msg, unsigned short len);
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uint64_t flushTo(SocketClient *writer, const uint64_t start,
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bool privileged, bool security,
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int (*filter)(const LogBufferElement *element, void *arg) = NULL,
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void *arg = NULL);
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bool clear(log_id_t id, uid_t uid = AID_ROOT);
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unsigned long getSize(log_id_t id);
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int setSize(log_id_t id, unsigned long size);
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unsigned long getSizeUsed(log_id_t id);
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// *strp uses malloc, use free to release.
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std::string formatStatistics(uid_t uid, pid_t pid, unsigned int logMask);
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void enableStatistics() {
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stats.enableStatistics();
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}
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int initPrune(const char *cp) { return mPrune.init(cp); }
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std::string formatPrune() { return mPrune.format(); }
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// helper must be protected directly or implicitly by lock()/unlock()
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const char *pidToName(pid_t pid) { return stats.pidToName(pid); }
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uid_t pidToUid(pid_t pid) { return stats.pidToUid(pid); }
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const char *uidToName(uid_t uid) { return stats.uidToName(uid); }
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void lock() { pthread_mutex_lock(&mLogElementsLock); }
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void unlock() { pthread_mutex_unlock(&mLogElementsLock); }
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private:
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static constexpr size_t minPrune = 4;
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static constexpr size_t maxPrune = 256;
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void maybePrune(log_id_t id);
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bool prune(log_id_t id, unsigned long pruneRows, uid_t uid = AID_ROOT);
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LogBufferElementCollection::iterator erase(
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LogBufferElementCollection::iterator it, bool coalesce = false);
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};
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#endif // _LOGD_LOG_BUFFER_H__
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