| /* |
| * 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 |
| * |
| * 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 <stdlib.h> |
| |
| #include <private/android_filesystem_config.h> |
| |
| #include "FlushCommand.h" |
| #include "LogBuffer.h" |
| #include "LogBufferElement.h" |
| #include "LogCommand.h" |
| #include "LogReader.h" |
| #include "LogTimes.h" |
| #include "LogUtils.h" |
| |
| // runSocketCommand is called once for every open client on the |
| // log reader socket. Here we manage and associated the reader |
| // client tracking and log region locks LastLogTimes list of |
| // LogTimeEntrys, and spawn a transitory per-client thread to |
| // work at filing data to the socket. |
| // |
| // global LogTimeEntry::wrlock() is used to protect access, |
| // reference counts are used to ensure that individual |
| // LogTimeEntry lifetime is managed when not protected. |
| void FlushCommand::runSocketCommand(SocketClient* client) { |
| LogTimeEntry* entry = nullptr; |
| LastLogTimes& times = mReader.logbuf().mTimes; |
| |
| LogTimeEntry::wrlock(); |
| LastLogTimes::iterator it = times.begin(); |
| while (it != times.end()) { |
| entry = (*it); |
| if (entry->mClient == client) { |
| if (!entry->isWatchingMultiple(mLogMask)) { |
| LogTimeEntry::unlock(); |
| return; |
| } |
| if (entry->mTimeout.tv_sec || entry->mTimeout.tv_nsec) { |
| if (mReader.logbuf().isMonotonic()) { |
| LogTimeEntry::unlock(); |
| return; |
| } |
| // If the user changes the time in a gross manner that |
| // invalidates the timeout, fall through and trigger. |
| log_time now(CLOCK_REALTIME); |
| if (((entry->mEnd + entry->mTimeout) > now) && |
| (now > entry->mEnd)) { |
| LogTimeEntry::unlock(); |
| return; |
| } |
| } |
| entry->triggerReader_Locked(); |
| if (entry->runningReader_Locked()) { |
| LogTimeEntry::unlock(); |
| return; |
| } |
| entry->incRef_Locked(); |
| break; |
| } |
| it++; |
| } |
| |
| if (it == times.end()) { |
| // Create LogTimeEntry in notifyNewLog() ? |
| if (mTail == (unsigned long)-1) { |
| LogTimeEntry::unlock(); |
| return; |
| } |
| entry = new LogTimeEntry(mReader, client, mNonBlock, mTail, mLogMask, |
| mPid, mStart, mTimeout); |
| times.push_front(entry); |
| } |
| |
| client->incRef(); |
| |
| // release client and entry reference counts once done |
| entry->startReader_Locked(); |
| LogTimeEntry::unlock(); |
| } |
| |
| bool FlushCommand::hasReadLogs(SocketClient* client) { |
| return clientHasLogCredentials(client); |
| } |
| |
| static bool clientHasSecurityCredentials(SocketClient* client) { |
| return (client->getUid() == AID_SYSTEM) || (client->getGid() == AID_SYSTEM); |
| } |
| |
| bool FlushCommand::hasSecurityLogs(SocketClient* client) { |
| return clientHasSecurityCredentials(client); |
| } |