blob: ca2c3a62c84d83a4f9b4524bb54506401b5405a0 [file] [log] [blame]
* Copyright (C) 2012-2014 The Android Open Source Project
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include <stdatomic.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sysutils/SocketClient.h>
#include <log/log.h>
#include <log/log_read.h>
// Hijack this header as a common include file used by most all sources
// to report some utilities defined here and there.
namespace android {
// Furnished in main.cpp. Caller must own and free returned value
char *uidToName(uid_t uid);
// Furnished in LogStatistics.cpp. Caller must own and free returned value
char *pidToName(pid_t pid);
char *tidToName(pid_t tid);
// Furnished in main.cpp. Thread safe.
const char *tagToName(uint32_t tag);
static inline bool worstUidEnabledForLogid(log_id_t id) {
return (id != LOG_ID_CRASH) && (id != LOG_ID_KERNEL) && (id != LOG_ID_EVENTS);
class LogBuffer;
#define EXPIRE_HOUR_THRESHOLD 24 // Only expire chatty UID logs to preserve
// non-chatty UIDs less than this age in hours
#define EXPIRE_THRESHOLD 10 // A smaller expire count is considered too
// chatty for the temporal expire messages
#define EXPIRE_RATELIMIT 10 // maximum rate in seconds to report expiration
class LogBufferElement {
const log_id_t mLogId;
const uid_t mUid;
const pid_t mPid;
const pid_t mTid;
char *mMsg;
union {
const unsigned short mMsgLen; // mMSg != NULL
unsigned short mDropped; // mMsg == NULL
const uint64_t mSequence;
const log_time mRealTime;
static atomic_int_fast64_t sequence;
// assumption: mMsg == NULL
size_t populateDroppedMessage(char *&buffer,
LogBuffer *parent);
LogBufferElement(log_id_t log_id, log_time realtime,
uid_t uid, pid_t pid, pid_t tid,
const char *msg, unsigned short len);
virtual ~LogBufferElement();
log_id_t getLogId() const { return mLogId; }
uid_t getUid(void) const { return mUid; }
pid_t getPid(void) const { return mPid; }
pid_t getTid(void) const { return mTid; }
unsigned short getDropped(void) const { return mMsg ? 0 : mDropped; }
unsigned short setDropped(unsigned short value) {
if (mMsg) {
mMsg = NULL;
return mDropped = value;
unsigned short getMsgLen() const { return mMsg ? mMsgLen : 0; }
uint64_t getSequence(void) const { return mSequence; }
static uint64_t getCurrentSequence(void) { return sequence.load(memory_order_relaxed); }
log_time getRealTime(void) const { return mRealTime; }
uint32_t getTag(void) const;
static const uint64_t FLUSH_ERROR;
uint64_t flushTo(SocketClient *writer, LogBuffer *parent);