517808981e
This is the last isMonotonic() user and can go away. This timestamp is set in the kernel source in either the audit_get_stamp() or __audit_syscall_entry() functions. In both cases, the value used is from ktime_get_coarse_real_ts64(), which is a realtime timestamp. Test: audit messages show in the log correctly. Change-Id: Ife6c09dd97fccdfc7a8f07ee63161079ae2eccc4
125 lines
4.2 KiB
C++
125 lines
4.2 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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#pragma once
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#include <sys/types.h>
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#include <list>
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#include <optional>
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#include <string>
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#include <android/log.h>
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#include <private/android_filesystem_config.h>
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#include <sysutils/SocketClient.h>
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#include "LogBufferElement.h"
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#include "LogReaderThread.h"
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#include "LogStatistics.h"
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#include "LogTags.h"
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#include "LogWhiteBlackList.h"
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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_rwlock_t mLogElementsLock;
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LogStatistics stats;
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// watermark of any worst/chatty uid processing
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typedef std::unordered_map<uid_t, 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, 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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LogBufferElement* lastLoggedElements[LOG_ID_MAX];
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LogBufferElement* droppedElements[LOG_ID_MAX];
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void log(LogBufferElement* elem);
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public:
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LastLogTimes& mTimes;
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LogBuffer(LastLogTimes* times, LogTags* tags, PruneList* prune);
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~LogBuffer();
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void init();
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int log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid, pid_t tid, const char* msg,
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uint16_t len);
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// lastTid is an optional context to help detect if the last previous
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// valid message was from the same source so we can differentiate chatty
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// filter types (identical or expired)
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uint64_t flushTo(SocketClient* writer, uint64_t start,
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pid_t* lastTid, // &lastTid[LOG_ID_MAX] or nullptr
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bool privileged, bool security,
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const std::function<int(const LogBufferElement* element)>& filter);
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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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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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// helper must be protected directly or implicitly by wrlock()/unlock()
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const char* pidToName(pid_t pid) {
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return stats.pidToName(pid);
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}
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uid_t pidToUid(pid_t pid) { return stats.pidToUid(pid); }
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const char* uidToName(uid_t uid) {
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return stats.uidToName(uid);
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}
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void wrlock() {
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pthread_rwlock_wrlock(&mLogElementsLock);
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}
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void rdlock() {
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pthread_rwlock_rdlock(&mLogElementsLock);
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}
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void unlock() {
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pthread_rwlock_unlock(&mLogElementsLock);
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}
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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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void kickMe(LogReaderThread* me, log_id_t id, unsigned long pruneRows);
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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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// Returns an iterator to the oldest element for a given log type, or mLogElements.end() if
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// there are no logs for the given log type. Requires mLogElementsLock to be held.
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LogBufferElementCollection::iterator GetOldest(log_id_t log_id);
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LogTags* tags_;
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PruneList* prune_;
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// Keeps track of the iterator to the oldest log message of a given log type, as an
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// optimization when pruning logs. Use GetOldest() to retrieve.
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std::optional<LogBufferElementCollection::iterator> oldest_[LOG_ID_MAX];
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};
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