310 lines
8.1 KiB
C++
310 lines
8.1 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 "config.h"
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#include "SigUtil.hpp"
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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 <sstream>
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#include <string>
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#include <thread>
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#include "Socket.hpp"
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#include "Common.hpp"
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#include "Log.hpp"
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/// Flag to request hard termination.
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std::atomic<bool> TerminationFlag(false);
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/// Flag to request dumping of all internal state
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std::atomic<bool> DumpGlobalState(false);
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/// Flag to request WSD to notify clients and shutdown.
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std::atomic<bool> ShutdownRequestFlag(false);
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std::mutex SigHandlerTrap;
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namespace SigUtil
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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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bool hardExit = false;
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const char *domain;
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if (!ShutdownRequestFlag && signal == SIGINT)
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{
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domain = " Shutdown signal received: ";
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ShutdownRequestFlag = true;
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}
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else if (!TerminationFlag)
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{
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domain = " Forced-Termination signal received: ";
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TerminationFlag = true;
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}
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else
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{
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domain = " ok, ok - hard-termination signal received: ";
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hardExit = true;
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}
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Log::signalLogPrefix();
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Log::signalLog(domain);
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Log::signalLog(signalName(signal));
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Log::signalLog("\n");
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if (!hardExit)
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SocketPoll::wakeupWorld();
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else
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{
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::signal (signal, SIG_DFL);
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::raise (signal);
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}
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}
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void requestShutdown()
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{
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ShutdownRequestFlag = true;
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SocketPoll::wakeupWorld();
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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(SIGINT, &action, nullptr);
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sigaction(SIGTERM, &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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std::unique_lock<std::mutex> lock(SigHandlerTrap);
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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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LOG_ERR("Sleeping 30s to allow debugging.");
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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, nullptr);
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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 != nullptr)
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{
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struct iovec ioVector[maxSlots*2+1];
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ioVector[0].iov_base = static_cast<void*>(header);
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ioVector[0].iov_len = std::strlen(static_cast<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(static_cast<const char *>(ioVector[1+i*2+0].iov_base));
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ioVector[1+i*2+1].iov_base = const_cast<void*>(static_cast<const 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_SYS("Failed to dump backtrace to stderr.");
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}
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}
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}
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if (std::getenv("LOOL_DEBUG"))
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{
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LOG_ERR("Sleeping 30s to allow debugging.");
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sleep(30);
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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, nullptr);
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sigaction(SIGBUS, &action, nullptr);
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sigaction(SIGABRT, &action, nullptr);
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sigaction(SIGILL, &action, nullptr);
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sigaction(SIGFPE, &action, nullptr);
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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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static
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void handleUserSignal(const int signal)
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{
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Log::signalLogPrefix();
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Log::signalLog(" User signal received: ");
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Log::signalLog(signalName(signal));
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Log::signalLog("\n");
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if (signal == SIGUSR1)
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{
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DumpGlobalState = true;
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SocketPoll::wakeupWorld();
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}
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}
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void setUserSignals()
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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 = handleUserSignal;
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sigaction(SIGUSR1, &action, nullptr);
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}
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bool killChild(const int pid)
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{
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LOG_DBG("Killing PID: " << pid);
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if (kill(pid, SIGTERM) == 0 || errno == ESRCH)
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{
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// Killed or doesn't exist.
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return true;
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}
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LOG_SYS("Error when trying to kill PID: " << pid << ". Will wait for termination.");
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const auto sleepMs = 50;
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const auto count = std::max(CHILD_REBALANCE_INTERVAL_MS / sleepMs, 2);
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for (int i = 0; i < count; ++i)
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{
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if (kill(pid, 0) == 0 || errno == ESRCH)
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{
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// Doesn't exist.
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return true;
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}
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std::this_thread::sleep_for(std::chrono::milliseconds(sleepMs));
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}
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return false;
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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