mirror of https://github.com/OpenTTD/OpenTTD.git
225 lines
6.1 KiB
C++
225 lines
6.1 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file crashlog_unix.cpp Unix crash log handler */
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#include "../../stdafx.h"
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#include "../../crashlog.h"
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#include "../../fileio_func.h"
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#include "../../string_func.h"
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#include "../../gamelog.h"
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#include "../../saveload/saveload.h"
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#include <setjmp.h>
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#include <signal.h>
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#include <sys/utsname.h>
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#if defined(__GLIBC__)
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/* Execinfo (and thus making stacktraces) is a GNU extension */
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# include <execinfo.h>
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#endif
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#ifdef WITH_UNOFFICIAL_BREAKPAD
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# include <client/linux/handler/exception_handler.h>
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#endif
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#if defined(__EMSCRIPTEN__)
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# include <emscripten.h>
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/* We avoid abort(), as it is a SIGBART, and use _exit() instead. But emscripten doesn't know _exit(). */
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# define _exit emscripten_force_exit
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#else
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#include <unistd.h>
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#endif
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#include "../../safeguards.h"
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/** The signals we want our crash handler to handle. */
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static constexpr int _signals_to_handle[] = { SIGSEGV, SIGABRT, SIGFPE, SIGBUS, SIGILL, SIGQUIT };
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/**
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* Unix implementation for the crash logger.
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*/
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class CrashLogUnix : public CrashLog {
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/** Signal that has been thrown. */
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int signum;
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void SurveyCrash(nlohmann::json &survey) const override
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{
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survey["id"] = signum;
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survey["reason"] = strsignal(signum);
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}
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void SurveyStacktrace([[maybe_unused]] nlohmann::json &survey) const override
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{
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#if defined(__GLIBC__)
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void *trace[64];
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int trace_size = backtrace(trace, lengthof(trace));
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survey = nlohmann::json::array();
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char **messages = backtrace_symbols(trace, trace_size);
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for (int i = 0; i < trace_size; i++) {
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survey.push_back(messages[i]);
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}
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free(messages);
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#endif
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}
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#ifdef WITH_UNOFFICIAL_BREAKPAD
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static bool MinidumpCallback(const google_breakpad::MinidumpDescriptor &descriptor, void *context, bool succeeded)
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{
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CrashLogUnix *crashlog = reinterpret_cast<CrashLogUnix *>(context);
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crashlog->crashdump_filename = crashlog->CreateFileName(".dmp");
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std::rename(descriptor.path(), crashlog->crashdump_filename.c_str());
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return succeeded;
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}
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bool WriteCrashDump() override
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{
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return google_breakpad::ExceptionHandler::WriteMinidump(_personal_dir, MinidumpCallback, this);
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}
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#endif
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/* virtual */ bool TryExecute(std::string_view section_name, std::function<bool()> &&func) override
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{
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this->try_execute_active = true;
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/* Setup a longjump in case a crash happens. */
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if (setjmp(this->internal_fault_jmp_buf) != 0) {
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fmt::print("Something went wrong when attempting to fill {} section of the crash log.\n", section_name);
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/* Reset the signals and continue on. The handler is responsible for dealing with the crash. */
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sigset_t sigs;
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sigemptyset(&sigs);
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for (int signum : _signals_to_handle) {
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sigaddset(&sigs, signum);
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}
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sigprocmask(SIG_UNBLOCK, &sigs, nullptr);
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this->try_execute_active = false;
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return false;
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}
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bool res = func();
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this->try_execute_active = false;
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return res;
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}
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public:
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/**
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* A crash log is always generated by signal.
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* @param signum the signal that was caused by the crash.
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*/
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CrashLogUnix(int signum) :
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signum(signum)
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{
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}
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/** Buffer to track the long jump set setup. */
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jmp_buf internal_fault_jmp_buf;
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/** Whether we are in a TryExecute block. */
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bool try_execute_active = false;
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/** Points to the current crash log. */
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static CrashLogUnix *current;
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};
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/* static */ CrashLogUnix *CrashLogUnix::current = nullptr;
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/**
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* Set a signal handler for all signals we want to capture.
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*
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* @param handler The handler to use.
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* @return sigset_t A sigset_t containing all signals we want to capture.
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*/
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static sigset_t SetSignals(void(*handler)(int))
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{
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sigset_t sigs;
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sigemptyset(&sigs);
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for (int signum : _signals_to_handle) {
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sigaddset(&sigs, signum);
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}
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_flags = SA_RESTART;
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sigemptyset(&sa.sa_mask);
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sa.sa_handler = handler;
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sa.sa_mask = sigs;
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for (int signum : _signals_to_handle) {
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sigaction(signum, &sa, nullptr);
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}
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return sigs;
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}
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/**
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* Entry point for a crash that happened during the handling of a crash.
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*
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* @param signum the signal that caused us to crash.
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*/
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static void CDECL HandleInternalCrash([[maybe_unused]] int signum)
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{
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if (CrashLogUnix::current == nullptr || !CrashLogUnix::current->try_execute_active) {
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fmt::print("Something went seriously wrong when creating the crash log. Aborting.\n");
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_exit(1);
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}
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longjmp(CrashLogUnix::current->internal_fault_jmp_buf, 1);
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}
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/**
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* Entry point for the crash handler.
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*
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* @param signum the signal that caused us to crash.
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*/
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static void CDECL HandleCrash(int signum)
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{
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if (CrashLogUnix::current != nullptr) {
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CrashLog::AfterCrashLogCleanup();
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_exit(2);
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}
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/* Capture crashing during the handling of a crash. */
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sigset_t sigs = SetSignals(HandleInternalCrash);
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sigset_t old_sigset;
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sigprocmask(SIG_UNBLOCK, &sigs, &old_sigset);
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if (_gamelog.TestEmergency()) {
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fmt::print("A serious fault condition occurred in the game. The game will shut down.\n");
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fmt::print("As you loaded an emergency savegame no crash information will be generated.\n");
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_exit(3);
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}
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if (SaveloadCrashWithMissingNewGRFs()) {
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fmt::print("A serious fault condition occurred in the game. The game will shut down.\n");
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fmt::print("As you loaded an savegame for which you do not have the required NewGRFs\n");
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fmt::print("no crash information will be generated.\n");
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_exit(3);
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}
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CrashLogUnix *log = new CrashLogUnix(signum);
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CrashLogUnix::current = log;
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log->MakeCrashLog();
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CrashLog::AfterCrashLogCleanup();
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_exit(2);
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}
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/* static */ void CrashLog::InitialiseCrashLog()
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{
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SetSignals(HandleCrash);
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}
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/* static */ void CrashLog::InitThread()
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{
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}
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