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/*
* Copyright (C) 2012-2013 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <ctype.h>
#include <poll.h>
#include <sys/prctl.h>
#include <sys/socket.h>
#include <cutils/sockets.h>
#include "LogReader.h"
#include "FlushCommand.h"
LogReader::LogReader(LogBuffer *logbuf) :
SocketListener(getLogSocket(), true),
mLogbuf(*logbuf) {
}
// When we are notified a new log entry is available, inform
// all of our listening sockets.
void LogReader::notifyNewLog() {
FlushCommand command(*this);
runOnEachSocket(&command);
}
bool LogReader::onDataAvailable(SocketClient *cli) {
static bool name_set;
if (!name_set) {
prctl(PR_SET_NAME, "logd.reader");
name_set = true;
}
char buffer[255];
int len = read(cli->getSocket(), buffer, sizeof(buffer) - 1);
if (len <= 0) {
doSocketDelete(cli);
return false;
}
buffer[len] = '\0';
unsigned long tail = 0;
static const char _tail[] = " tail=";
char *cp = strstr(buffer, _tail);
if (cp) {
tail = atol(cp + sizeof(_tail) - 1);
}
log_time start(log_time::EPOCH);
static const char _start[] = " start=";
cp = strstr(buffer, _start);
if (cp) {
// Parse errors will result in current time
start.strptime(cp + sizeof(_start) - 1, "%s.%q");
}
unsigned int logMask = -1;
static const char _logIds[] = " lids=";
cp = strstr(buffer, _logIds);
if (cp) {
logMask = 0;
cp += sizeof(_logIds) - 1;
while (*cp && *cp != '\0') {
int val = 0;
while (isdigit(*cp)) {
val = val * 10 + *cp - '0';
++cp;
}
logMask |= 1 << val;
if (*cp != ',') {
break;
}
++cp;
}
}
pid_t pid = 0;
static const char _pid[] = " pid=";
cp = strstr(buffer, _pid);
if (cp) {
pid = atol(cp + sizeof(_pid) - 1);
}
bool nonBlock = false;
if (strncmp(buffer, "dumpAndClose", 12) == 0) {
// Allow writer to get some cycles, and wait for pending notifications
sched_yield();
LogTimeEntry::lock();
LogTimeEntry::unlock();
sched_yield();
nonBlock = true;
}
uint64_t sequence = 1;
// Convert realtime to sequence number
if (start != log_time::EPOCH) {
class LogFindStart {
const pid_t mPid;
const unsigned mLogMask;
bool startTimeSet;
log_time &start;
uint64_t &sequence;
uint64_t last;
public:
LogFindStart(unsigned logMask, pid_t pid, log_time &start, uint64_t &sequence) :
mPid(pid),
mLogMask(logMask),
startTimeSet(false),
start(start),
sequence(sequence),
last(sequence) {
}
static int callback(const LogBufferElement *element, void *obj) {
LogFindStart *me = reinterpret_cast<LogFindStart *>(obj);
if ((!me->mPid || (me->mPid == element->getPid()))
&& (me->mLogMask & (1 << element->getLogId()))) {
if (me->start == element->getRealTime()) {
me->sequence = element->getSequence();
me->startTimeSet = true;
return -1;
} else {
if (me->start < element->getRealTime()) {
me->sequence = me->last;
me->startTimeSet = true;
return -1;
}
me->last = element->getSequence();
}
}
return false;
}
bool found() { return startTimeSet; }
} logFindStart(logMask, pid, start, sequence);
logbuf().flushTo(cli, sequence, FlushCommand::hasReadLogs(cli),
logFindStart.callback, &logFindStart);
if (!logFindStart.found()) {
if (nonBlock) {
doSocketDelete(cli);
return false;
}
sequence = LogBufferElement::getCurrentSequence();
}
}
FlushCommand command(*this, nonBlock, tail, logMask, pid, sequence);
command.runSocketCommand(cli);
return true;
}
void LogReader::doSocketDelete(SocketClient *cli) {
LastLogTimes × = mLogbuf.mTimes;
LogTimeEntry::lock();
LastLogTimes::iterator it = times.begin();
while(it != times.end()) {
LogTimeEntry *entry = (*it);
if (entry->mClient == cli) {
times.erase(it);
entry->release_Locked();
break;
}
it++;
}
LogTimeEntry::unlock();
}
int LogReader::getLogSocket() {
static const char socketName[] = "logdr";
int sock = android_get_control_socket(socketName);
if (sock < 0) {
sock = socket_local_server(socketName,
ANDROID_SOCKET_NAMESPACE_RESERVED,
SOCK_SEQPACKET);
}
return sock;
}
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