summaryrefslogtreecommitdiffstats
path: root/HandleCrash.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'HandleCrash.cpp')
-rw-r--r--HandleCrash.cpp375
1 files changed, 0 insertions, 375 deletions
diff --git a/HandleCrash.cpp b/HandleCrash.cpp
deleted file mode 100644
index f8a5d5d5..00000000
--- a/HandleCrash.cpp
+++ /dev/null
@@ -1,375 +0,0 @@
-/* Copyright 2013-2014 MultiMC Contributors
- *
- * 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.
- */
-
-// This is the Unix implementation of MultiMC's crash handling system.
-#include <stdio.h>
-#include <iostream>
-#include <signal.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <time.h>
-#include <fcntl.h>
-#include <errno.h>
-#include <sys/stat.h>
-
-#include <MultiMC.h>
-
-#if defined Q_OS_UNIX
-#include <sys/utsname.h>
-#include <execinfo.h>
-#elif defined Q_OS_WIN32
-#include <windows.h>
-#include <dbghelp.h>
-#include <WinBacktrace.h>
-#endif
-
-#include "BuildConfig.h"
-
-#include "HandleCrash.h"
-
-// The maximum number of frames to include in the backtrace.
-#define BT_SIZE 20
-
-
-#define DUMPF_NAME_FMT "mmc-crash-%X.bm" // Black magic? Bowel movement? Dump?
-// 1234567890 1234
-// The maximum number of digits in a unix timestamp when encoded in hexadecimal is about 17.
-// Our format string is ~14 characters long.
-// The maximum length of the dump file's filename should be well over both of these. 42 is a good number.
-#define DUMPF_NAME_LEN 42
-
-// {{{ Platform hackery
-
-#if defined Q_OS_UNIX
-
-struct CrashData
-{
- int signal = 0;
-};
-
-// This has to be declared here, after the CrashData struct, but before the function that uses it.
-void handleCrash(CrashData);
-
-void handler(int sig)
-{
- CrashData cData;
- cData.signal = sig;
- handleCrash(cData);
-}
-
-#elif defined Q_OS_WIN32
-
-// Struct for storing platform specific crash information.
-// This gets passed into the generic handler, which will use
-// it to access platform specific information.
-struct CrashData
-{
- EXCEPTION_RECORD* exceptionInfo;
- CONTEXT* context;
-};
-
-void handleCrash(CrashData);
-
-LONG WINAPI ExceptionFilter(EXCEPTION_POINTERS* eInfo)
-{
- CrashData cData;
- cData.exceptionInfo = eInfo->ExceptionRecord;
- cData.context = eInfo->ContextRecord;
- handleCrash(cData);
- return EXCEPTION_EXECUTE_HANDLER;
-}
-
-#endif
-
-// }}}
-
-// {{{ Handling
-
-#ifdef Q_OS_WIN32
-// #ThanksMicrosoft
-// Blame Microsoft for this atrocity.
-void dprintf(int fd, const char* fmt...)
-{
- va_list args;
- va_start(args, fmt);
- char buffer[10240];
- // Just sprintf to a really long string and hope it works...
- // This is a hack, but I can't think of a better way to do it easily.
- int len = vsnprintf(buffer, 10240, fmt, args);
- printf(buffer, fmt, args);
- write(fd, buffer, len);
- va_end(args);
-}
-#endif
-
-void getVsnType(char* out);
-void readFromTo(int from, int to);
-
-void dumpErrorInfo(int dumpFile, CrashData crash)
-{
-#ifdef Q_OS_UNIX
- // TODO: Moar unix
- dprintf(dumpFile, "Signal: %d\n", crash.signal);
-#elif defined Q_OS_WIN32
- EXCEPTION_RECORD* excInfo = crash.exceptionInfo;
-
- dprintf(dumpFile, "Exception Code: %d\n", excInfo->ExceptionCode);
- dprintf(dumpFile, "Exception Address: 0x%0X\n", excInfo->ExceptionAddress);
-#endif
-}
-
-void dumpMiscInfo(int dumpFile)
-{
- char vsnType[42]; // The version type. If it's more than 42 chars, the universe might implode...
-
- // Get MMC info.
- getVsnType(vsnType);
-
- // Get MMC info.
- getVsnType(vsnType);
-
- dprintf(dumpFile, "MultiMC Version: %s\n", BuildConfig.VERSION_CSTR);
- dprintf(dumpFile, "MultiMC Version Type: %s\n", vsnType);
-}
-
-void dumpBacktrace(int dumpFile, CrashData crash)
-{
-#ifdef Q_OS_UNIX
- // Variables for storing crash info.
- void* trace[BT_SIZE]; // Backtrace frames
- size_t size; // The backtrace size
-
- // Get the backtrace.
- size = backtrace(trace, BT_SIZE);
-
- // Dump the backtrace
- dprintf(dumpFile, "---- BEGIN BACKTRACE ----\n");
- backtrace_symbols_fd(trace, size, dumpFile);
- dprintf(dumpFile, "---- END BACKTRACE ----\n");
-#elif defined Q_OS_WIN32
- dprintf(dumpFile, "---- BEGIN BACKTRACE ----\n");
-
- StackFrame stack[BT_SIZE];
- size_t size;
-
- SYMBOL_INFO *symbol;
- HANDLE process;
-
- size = getBacktrace(stack, BT_SIZE, *crash.context);
-
- // FIXME: Accessing heap memory is supposedly "dangerous",
- // but I can't find another way of doing this.
-
- // Initialize
- process = GetCurrentProcess();
- if (!SymInitialize(process, NULL, true))
- {
- dprintf(dumpFile, "Failed to initialize symbol handler. Can't print stack trace.\n");
- dprintf(dumpFile, "Here's a list of addresses in the call stack instead:\n");
- for(int i = 0; i < size; i++)
- {
- dprintf(dumpFile, "0x%0X\n", (DWORD64)stack[i].address);
- }
- } else {
- // Allocate memory... ._.
- symbol = (SYMBOL_INFO *) calloc(sizeof(SYMBOL_INFO) + 256 * sizeof(char), 1);
- symbol->MaxNameLen = 255;
- symbol->SizeOfStruct = sizeof(SYMBOL_INFO);
-
- // Dump stacktrace
- for(int i = 0; i < size; i++)
- {
- DWORD64 addr = (DWORD64)stack[i].address;
- if (!SymFromAddr(process, (DWORD64)(addr), 0, symbol))
- dprintf(dumpFile, "?? - 0x%0X\n", addr);
- else
- dprintf(dumpFile, "%s - 0x%0X\n", symbol->Name, symbol->Address);
- }
-
- free(symbol);
- }
-
- dprintf(dumpFile, "---- END BACKTRACE ----\n");
-#endif
-}
-
-void dumpSysInfo(int dumpFile)
-{
-#ifdef Q_OS_UNIX
- utsname sysinfo; // System information
-
- // Dump system info
- if (uname(&sysinfo) >= 0)
- {
- dprintf(dumpFile, "OS System: %s\n", sysinfo.sysname);
- dprintf(dumpFile, "OS Machine: %s\n", sysinfo.machine);
- dprintf(dumpFile, "OS Release: %s\n", sysinfo.release);
- dprintf(dumpFile, "OS Version: %s\n", sysinfo.version);
- } else {
- dprintf(dumpFile, "OS System: Unknown Unix");
- }
-#else
- // TODO: Get more information here.
- dprintf(dumpFile, "OS System: Windows");
-#endif
-}
-
-void dumpLogs(int dumpFile)
-{
- int otherFile;
-
- // Attempt to attach the log file if the logger was initialized.
- dprintf(dumpFile, "---- BEGIN LOGS ----\n");
- if (loggerInitialized)
- {
- otherFile = open("MultiMC-0.log", O_RDONLY);
- readFromTo(otherFile, dumpFile);
- } else {
- dprintf(dumpFile, "Logger not initialized.\n");
- }
- dprintf(dumpFile, "---- END LOGS ----\n");
-}
-
-// The signal handler. If this function is called, it means shit has probably collided with some sort of device one might use to keep oneself cool.
-// This is the generic part of the code that will be called after platform specific handling is finished.
-void handleCrash(CrashData crash)
-{
-#ifdef Q_OS_UNIX
- fprintf(stderr, "Fatal error! Received signal %d\n", crash.signal);
-#endif
-
- time_t unixTime = 0; // Unix timestamp. Used to give our crash dumps "unique" names.
-
- char dumpFileName[DUMPF_NAME_LEN]; // The name of the file we're dumping to.
- int dumpFile; // File descriptor for our dump file.
-
- // Determine what our dump file should be called.
- // We'll just call it "mmc-crash-<unixtime>.dump"
- // First, check the time.
- time(&unixTime);
-
- // Now we get to do some !!FUN!! hackery to ensure we don't use the stack when we convert
- // the timestamp from an int to a string. To do this, we just allocate a fixed size array
- // of chars on the stack, and sprintf into it. We know the timestamp won't ever be longer
- // than a certain number of digits, so this should work just fine.
- // sprintf doesn't support writing signed values as hex, so this breaks on negative timestamps.
- // It really shouldn't matter, though...
- sprintf(dumpFileName, DUMPF_NAME_FMT, unixTime);
-
- // Now, we need to open the file.
- // Fail if it already exists. This should never happen.
- dumpFile = open(dumpFileName, O_WRONLY | O_CREAT | O_TRUNC, 0644);
-
-
- if (dumpFile >= 0)
- {
- // If we opened the dump file successfully.
- // Dump everything we can and GTFO.
- fprintf(stderr, "Dumping crash report to %s\n", dumpFileName);
-
- // Dump misc info
- dprintf(dumpFile, "Unix Time: %d\n", unixTime);
- dumpErrorInfo(dumpFile, crash);
- dumpMiscInfo(dumpFile);
-
- dprintf(dumpFile, "\n");
-
- dumpSysInfo(dumpFile);
-
- dprintf(dumpFile, "\n");
-
- dumpBacktrace(dumpFile, crash);
-
- dprintf(dumpFile, "\n");
-
- // DIE DIE DIE!
- exit(1);
- }
- else
- {
- fprintf(stderr, "Failed to open dump file %s to write crash info (ERRNO: %d)\n", dumpFileName, errno);
- exit(2);
- }
-}
-
-
-// Reads data from the file descriptor on the first argument into the second argument.
-void readFromTo(int from, int to)
-{
- char buffer[1024];
- size_t lastread = 1;
- while (lastread > 0)
- {
- lastread = read(from, buffer, 1024);
- if (lastread > 0) write(to, buffer, lastread);
- }
-}
-
-// Writes the current version type to the given char buffer.
-void getVsnType(char* out)
-{
- switch (BuildConfig.versionTypeEnum)
- {
- case Config::Release:
- sprintf(out, "Release");
- break;
- case Config::ReleaseCandidate:
- sprintf(out, "ReleaseCandidate");
- break;
- case Config::Development:
- sprintf(out, "Development");
- break;
- default:
- sprintf(out, "Unknown");
- break;
- }
-}
-
-// }}}
-
-// {{{ Misc
-
-#if defined TEST_SEGV
-// Causes a crash. For testing.
-void testCrash()
-{
- char* lol = (char*)MMC->settings().get();
- lol -= 8;
-
- // Throw shit at the fan.
- for (int i = 0; i < 8; i++)
- lol[i] = 'f';
-}
-#endif
-
-// Initializes the Unix crash handler.
-void initBlackMagic()
-{
-#ifdef Q_OS_UNIX
- // Register the handler.
- signal(SIGSEGV, handler);
- signal(SIGABRT, handler);
-#elif defined Q_OS_WIN32
- // I hate Windows
- SetUnhandledExceptionFilter(ExceptionFilter);
-#endif
-
-#ifdef TEST_SEGV
- testCrash();
-#endif
-}
-
-// }}}
-