3dbaae7f44
Change-Id: I773cc9bafc1593e125af2dbcd2471daf4685d125
558 lines
15 KiB
C++
558 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include "Util.hpp"
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#include "config.h"
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#include <execinfo.h>
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#include <csignal>
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#include <sys/poll.h>
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#include <sys/prctl.h>
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#include <sys/stat.h>
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#include <sys/uio.h>
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#include <sys/vfs.h>
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#include <unistd.h>
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#include <atomic>
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#include <cassert>
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#include <chrono>
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#include <cstdio>
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#include <cstdlib>
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#include <cstring>
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#include <fstream>
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#include <iomanip>
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#include <iostream>
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#include <mutex>
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#include <random>
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#include <sstream>
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#include <string>
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#include <Poco/Base64Encoder.h>
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#include <Poco/ConsoleChannel.h>
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#include <Poco/Exception.h>
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#include <Poco/Format.h>
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#include <Poco/Net/WebSocket.h>
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#include <Poco/Process.h>
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#include <Poco/RandomStream.h>
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#include <Poco/TemporaryFile.h>
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#include <Poco/Thread.h>
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#include <Poco/Timestamp.h>
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#include <Poco/Util/Application.h>
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#include "Common.hpp"
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#include "Log.hpp"
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#include "Util.hpp"
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std::atomic<bool> TerminationFlag(false);
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namespace Util
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{
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namespace rng
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{
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static std::random_device _rd;
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static std::mutex _rngMutex;
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static Poco::RandomBuf _randBuf;
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// Create the prng with a random-device for seed.
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// If we don't have a hardware random-device, we will get the same seed.
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// In that case we are better off with an arbitrary, but changing, seed.
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static std::mt19937_64 _rng = std::mt19937_64(_rd.entropy()
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? _rd()
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: (clock() + getpid()));
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// A new seed is used to shuffle the sequence.
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// N.B. Always reseed after getting forked!
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void reseed()
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{
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_rng.seed(_rd.entropy() ? _rd() : (clock() + getpid()));
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}
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// Returns a new random number.
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unsigned getNext()
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{
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std::unique_lock<std::mutex> lock(_rngMutex);
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return _rng();
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}
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std::vector<char> getBytes(const size_t length)
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{
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std::vector<char> v(length);
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_randBuf.readFromDevice(v.data(), v.size());
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return v;
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}
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/// Generates a random string in Base64.
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/// Note: May contain '/' characters.
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std::string getB64String(const size_t length)
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{
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std::stringstream ss;
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Poco::Base64Encoder b64(ss);
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b64.write(getBytes(length).data(), length);
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return ss.str().substr(0, length);
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}
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/// Generates a random string suitable for
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/// file/directory names.
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std::string getFilename(const size_t length)
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{
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std::string s = getB64String(length);
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std::replace(s.begin(), s.end(), '/', '_');
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return s.substr(0, length);
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}
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}
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}
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namespace
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{
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void alertAllUsersAndLog(const std::string& message, const std::string& cmd, const std::string& kind)
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{
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Log::error(message);
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Util::alertAllUsers(cmd, kind);
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}
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}
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namespace Util
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{
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std::string encodeId(const unsigned number, const int padding)
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{
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std::ostringstream oss;
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oss << std::hex << std::setw(padding) << std::setfill('0') << number;
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return oss.str();
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}
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unsigned decodeId(const std::string& str)
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{
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unsigned id = 0;
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std::stringstream ss;
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ss << std::hex << str;
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ss >> id;
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return id;
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}
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/// Create a secure, random directory path.
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std::string createRandomDir(const std::string& path)
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{
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const auto name = rng::getFilename(64);
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Poco::File(Poco::Path(path, name)).createDirectories();
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return name;
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}
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std::string getTempFilePath(const std::string& srcDir, const std::string& srcFilename)
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{
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const std::string srcPath = srcDir + '/' + srcFilename;
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const std::string dstPath = Poco::Path::temp() + encodeId(rng::getNext()) + '_' + srcFilename;
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Poco::File(srcPath).copyTo(dstPath);
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Poco::TemporaryFile::registerForDeletion(dstPath);
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return dstPath;
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}
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bool windowingAvailable()
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{
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return std::getenv("DISPLAY") != nullptr;
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}
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bool saveDataToFileSafely(const std::string& fileName, const char *data, size_t size)
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{
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const auto tempFileName = fileName + ".temp";
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std::fstream outStream(tempFileName, std::ios::out);
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// If we can't create the file properly, just remove it
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if (!outStream.good())
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{
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alertAllUsersAndLog("Creating " + tempFileName + " failed, disk full?", "internal", "diskfull");
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// Try removing both just in case
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std::remove(tempFileName.c_str());
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std::remove(fileName.c_str());
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return false;
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}
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else
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{
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outStream.write(data, size);
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if (!outStream.good())
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{
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alertAllUsersAndLog("Writing to " + tempFileName + " failed, disk full?", "internal", "diskfull");
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outStream.close();
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std::remove(tempFileName.c_str());
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std::remove(fileName.c_str());
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return false;
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}
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else
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{
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outStream.close();
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if (!outStream.good())
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{
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alertAllUsersAndLog("Closing " + tempFileName + " failed, disk full?", "internal", "diskfull");
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std::remove(tempFileName.c_str());
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std::remove(fileName.c_str());
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return false;
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}
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else
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{
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// Everything OK, rename the file to its proper name
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if (std::rename(tempFileName.c_str(), fileName.c_str()) == 0)
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{
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Log::debug() << "Renaming " << tempFileName << " to " << fileName << " OK." << Log::end;
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return true;
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}
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else
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{
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alertAllUsersAndLog("Renaming " + tempFileName + " to " + fileName + " failed, disk full?", "internal", "diskfull");
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std::remove(tempFileName.c_str());
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std::remove(fileName.c_str());
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return false;
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}
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}
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}
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}
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}
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} // namespace Util
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namespace
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{
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struct fs
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{
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fs(const std::string& p, dev_t d)
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: path(p), dev(d)
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{
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}
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fs(dev_t d)
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: fs("", d)
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{
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}
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std::string path;
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dev_t dev;
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};
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struct fsComparator
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{
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bool operator() (const fs& lhs, const fs& rhs) const
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{
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return (lhs.dev < rhs.dev);
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}
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};
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static std::mutex fsmutex;
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static std::set<fs, fsComparator> filesystems;
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} // unnamed namespace
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namespace Util
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{
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void registerFileSystemForDiskSpaceChecks(const std::string& path)
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{
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std::lock_guard<std::mutex> lock(fsmutex);
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if (path != "")
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{
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std::string dirPath = path;
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std::string::size_type lastSlash = dirPath.rfind('/');
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assert(lastSlash != std::string::npos);
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dirPath = dirPath.substr(0, lastSlash + 1) + ".";
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struct stat s;
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if (stat(dirPath.c_str(), &s) == -1)
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return;
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filesystems.insert(fs(dirPath, s.st_dev));
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}
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}
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void checkDiskSpaceOnRegisteredFileSystems()
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{
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std::lock_guard<std::mutex> lock(fsmutex);
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static std::chrono::steady_clock::time_point lastCheck;
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std::chrono::steady_clock::time_point now(std::chrono::steady_clock::now());
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// Don't check more often that once a minute
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if (std::chrono::duration_cast<std::chrono::seconds>(now - lastCheck).count() < 60)
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return;
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lastCheck = now;
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for (auto& i: filesystems)
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{
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if (!checkDiskSpace(i.path))
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{
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alertAllUsersAndLog("File system of " + i.path + " dangerously low on disk space", "internal", "diskfull");
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break;
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}
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}
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}
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bool checkDiskSpace(const std::string& path)
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{
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assert(path != "");
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struct statfs sfs;
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if (statfs(path.c_str(), &sfs) == -1)
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return true;
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if (static_cast<double>(sfs.f_bavail) / sfs.f_blocks <= 0.05)
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return false;
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return true;
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}
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const char *signalName(const int signo)
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{
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switch (signo)
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{
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#define CASE(x) case SIG##x: return "SIG" #x
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CASE(HUP);
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CASE(INT);
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CASE(QUIT);
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CASE(ILL);
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CASE(ABRT);
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CASE(FPE);
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CASE(KILL);
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CASE(SEGV);
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CASE(PIPE);
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CASE(ALRM);
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CASE(TERM);
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CASE(USR1);
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CASE(USR2);
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CASE(CHLD);
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CASE(CONT);
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CASE(STOP);
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CASE(TSTP);
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CASE(TTIN);
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CASE(TTOU);
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CASE(BUS);
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#ifdef SIGPOLL
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CASE(POLL);
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#endif
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CASE(PROF);
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CASE(SYS);
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CASE(TRAP);
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CASE(URG);
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CASE(VTALRM);
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CASE(XCPU);
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CASE(XFSZ);
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#ifdef SIGEMT
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CASE(EMT);
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#endif
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#ifdef SIGSTKFLT
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CASE(STKFLT);
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#endif
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#if defined(SIGIO) && SIGIO != SIGPOLL
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CASE(IO);
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#endif
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#ifdef SIGPWR
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CASE(PWR);
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#endif
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#ifdef SIGLOST
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CASE(LOST);
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#endif
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CASE(WINCH);
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#if defined(SIGINFO) && SIGINFO != SIGPWR
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CASE(INFO);
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#endif
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#undef CASE
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default:
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return "unknown";
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}
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}
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static
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void handleTerminationSignal(const int signal)
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{
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if (!TerminationFlag)
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{
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TerminationFlag = true;
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Log::signalLogPrefix();
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Log::signalLog(" Termination signal received: ");
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Log::signalLog(signalName(signal));
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Log::signalLog("\n");
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}
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}
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void setTerminationSignals()
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{
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struct sigaction action;
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sigemptyset(&action.sa_mask);
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action.sa_flags = 0;
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action.sa_handler = handleTerminationSignal;
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sigaction(SIGTERM, &action, nullptr);
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sigaction(SIGINT, &action, nullptr);
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sigaction(SIGQUIT, &action, nullptr);
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sigaction(SIGHUP, &action, nullptr);
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}
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static char FatalGdbString[256] = { '\0' };
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static
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void handleFatalSignal(const int signal)
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{
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Log::signalLogPrefix();
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Log::signalLog(" Fatal signal received: ");
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Log::signalLog(signalName(signal));
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Log::signalLog("\n");
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if (std::getenv("LOOL_DEBUG"))
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{
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Log::signalLog(FatalGdbString);
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sleep(30);
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}
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struct sigaction action;
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sigemptyset(&action.sa_mask);
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action.sa_flags = 0;
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action.sa_handler = SIG_DFL;
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sigaction(signal, &action, NULL);
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char header[32];
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sprintf(header, "Backtrace %d:\n", getpid());
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const int maxSlots = 50;
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void *backtraceBuffer[maxSlots];
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int numSlots = backtrace(backtraceBuffer, maxSlots);
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if (numSlots > 0)
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{
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char **symbols = backtrace_symbols(backtraceBuffer, numSlots);
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if (symbols != NULL)
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{
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struct iovec ioVector[maxSlots*2+1];
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ioVector[0].iov_base = (void*)header;
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ioVector[0].iov_len = std::strlen((const char*)ioVector[0].iov_base);
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for (int i = 0; i < numSlots; i++)
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{
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ioVector[1+i*2+0].iov_base = symbols[i];
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ioVector[1+i*2+0].iov_len = std::strlen((const char *)ioVector[1+i*2+0].iov_base);
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ioVector[1+i*2+1].iov_base = (void*)"\n";
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ioVector[1+i*2+1].iov_len = 1;
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}
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if (writev(STDERR_FILENO, ioVector, numSlots*2+1) == -1)
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{
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Log::syserror("Failed to dump backtrace to stderr.");
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}
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}
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}
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// let default handler process the signal
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kill(Poco::Process::id(), signal);
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}
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void setFatalSignals()
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{
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struct sigaction action;
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sigemptyset(&action.sa_mask);
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action.sa_flags = 0;
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action.sa_handler = handleFatalSignal;
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sigaction(SIGSEGV, &action, NULL);
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sigaction(SIGBUS, &action, NULL);
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sigaction(SIGABRT, &action, NULL);
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sigaction(SIGILL, &action, NULL);
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sigaction(SIGFPE, &action, NULL);
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// prepare this in advance just in case.
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std::ostringstream stream;
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stream << "\nFatal signal! Attach debugger with:\n"
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<< "sudo gdb --pid=" << Poco::Process::id() << "\n or \n"
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<< "sudo gdb --q --n --ex 'thread apply all backtrace full' --batch --pid="
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<< Poco::Process::id() << "\n";
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std::string streamStr = stream.str();
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assert (sizeof (FatalGdbString) > strlen(streamStr.c_str()) + 1);
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strncpy(FatalGdbString, streamStr.c_str(), sizeof(FatalGdbString));
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}
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void requestTermination(const Poco::Process::PID& pid)
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{
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try
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{
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Poco::Process::requestTermination(pid);
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}
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catch(const Poco::Exception& exc)
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{
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Log::warn("Util::requestTermination: Exception: " + exc.message());
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}
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}
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int getMemoryUsage(const Poco::Process::PID nPid)
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{
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//TODO: Instead of RSS, return PSS
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const auto cmd = "ps o rss= -p " + std::to_string(nPid);
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FILE* fp = popen(cmd.c_str(), "r");
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if (fp == nullptr)
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{
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return 0;
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}
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std::string sResponse;
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char cmdBuffer[1024];
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while (fgets(cmdBuffer, sizeof(cmdBuffer) - 1, fp) != nullptr)
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{
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sResponse += cmdBuffer;
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}
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pclose(fp);
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int nMem = -1;
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try
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{
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nMem = std::stoi(sResponse);
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}
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catch(std::exception& e)
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{
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Log::warn() << "Trying to find memory of invalid/dead PID" << Log::end;
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}
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return nMem;
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}
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std::string replace(const std::string& s, const std::string& a, const std::string& b)
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{
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std::string result = s;
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std::string::size_type pos;
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while ((pos = result.find(a)) != std::string::npos)
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{
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result = result.replace(pos, a.size(), b);
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}
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return result;
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}
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std::string formatLinesForLog(const std::string& s)
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{
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std::string r;
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std::string::size_type n = s.size();
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if (n > 0 && s.back() == '\n')
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r = s.substr(0, n-1);
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else
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r = s;
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return replace(r, "\n", " / ");
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}
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void setThreadName(const std::string& s)
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{
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if (prctl(PR_SET_NAME, reinterpret_cast<unsigned long>(s.c_str()), 0, 0, 0) != 0)
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Log::syserror("Cannot set thread name to " + s + ".");
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}
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void getVersionInfo(std::string& version, std::string& hash)
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{
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version = std::string(LOOLWSD_VERSION);
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hash = std::string(LOOLWSD_VERSION_HASH);
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hash.resize(std::min(8, (int)hash.length()));
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}
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std::string UniqueId()
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{
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static std::atomic_int counter(0);
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return std::to_string(Poco::Process::id()) + "/" + std::to_string(counter++);
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}
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}
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