| /* |
| * 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 "FlushCommand.h" |
| #include "LogBuffer.h" |
| #include "LogBufferElement.h" |
| #include "LogReader.h" |
| #include "LogUtils.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"); |
| } |
| |
| uint64_t timeout = 0; |
| static const char _timeout[] = " timeout="; |
| cp = strstr(buffer, _timeout); |
| if (cp) { |
| timeout = atol(cp + sizeof(_timeout) - 1) * NS_PER_SEC + |
| log_time(CLOCK_REALTIME).nsec(); |
| } |
| |
| 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 (!fast<strncmp>(buffer, "dumpAndClose", 12)) { |
| // 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; |
| bool isMonotonic; |
| |
| public: |
| LogFindStart(unsigned logMask, pid_t pid, log_time &start, uint64_t &sequence, bool isMonotonic) : |
| mPid(pid), |
| mLogMask(logMask), |
| startTimeSet(false), |
| start(start), |
| sequence(sequence), |
| last(sequence), |
| isMonotonic(isMonotonic) { |
| } |
| |
| 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->isMonotonic || |
| android::isMonotonic(element->getRealTime())) { |
| if (me->start < element->getRealTime()) { |
| me->sequence = me->last; |
| me->startTimeSet = true; |
| return -1; |
| } |
| me->last = element->getSequence(); |
| } else { |
| me->last = element->getSequence(); |
| } |
| } |
| return false; |
| } |
| |
| bool found() { return startTimeSet; } |
| } logFindStart(logMask, pid, start, sequence, |
| logbuf().isMonotonic() && android::isMonotonic(start)); |
| |
| logbuf().flushTo(cli, sequence, FlushCommand::hasReadLogs(cli), |
| FlushCommand::hasSecurityLogs(cli), |
| logFindStart.callback, &logFindStart); |
| |
| if (!logFindStart.found()) { |
| if (nonBlock) { |
| doSocketDelete(cli); |
| return false; |
| } |
| sequence = LogBufferElement::getCurrentSequence(); |
| } |
| } |
| |
| FlushCommand command(*this, nonBlock, tail, logMask, pid, sequence, timeout); |
| 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; |
| } |