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/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file crashlog_unix.cpp Unix crash log handler */
#include "../../stdafx.h"
#include "../../crashlog.h"
#include "../../string_func.h"
#include "../../gamelog.h"
#include "../../saveload/saveload.h"
#include <errno.h>
#include <signal.h>
#include <sys/utsname.h>
#if defined(__GLIBC__)
/* Execinfo (and thus making stacktraces) is a GNU extension */
# include <execinfo.h>
#elif defined(SUNOS)
# include <ucontext.h>
# include <dlfcn.h>
#endif
#if defined(__NetBSD__)
#include <unistd.h>
#endif
#include "../../safeguards.h"
/**
* Unix implementation for the crash logger.
*/
class CrashLogUnix : public CrashLog {
/** Signal that has been thrown. */
int signum;
char *LogOSVersion(char *buffer, const char *last) const override
{
struct utsname name;
if (uname(&name) < 0) {
return buffer + seprintf(buffer, last, "Could not get OS version: %s\n", strerror(errno));
}
return buffer + seprintf(buffer, last,
"Operating system:\n"
" Name: %s\n"
" Release: %s\n"
" Version: %s\n"
" Machine: %s\n",
name.sysname,
name.release,
name.version,
name.machine
);
}
char *LogError(char *buffer, const char *last, const char *message) const override
{
return buffer + seprintf(buffer, last,
"Crash reason:\n"
" Signal: %s (%d)\n"
" Message: %s\n\n",
strsignal(this->signum),
this->signum,
message == nullptr ? "<none>" : message
);
}
#if defined(SUNOS)
/** Data needed while walking up the stack */
struct StackWalkerParams {
char **bufptr; ///< Buffer
const char *last; ///< End of buffer
int counter; ///< We are at counter-th stack level
};
/**
* Callback used while walking up the stack.
* @param pc program counter
* @param sig 'active' signal (unused)
* @param params parameters
* @return always 0, continue walking up the stack
*/
static int SunOSStackWalker(uintptr_t pc, int sig, void *params)
{
StackWalkerParams *wp = (StackWalkerParams *)params;
/* Resolve program counter to file and nearest symbol (if possible) */
Dl_info dli;
if (dladdr((void *)pc, &dli) != 0) {
*wp->bufptr += seprintf(*wp->bufptr, wp->last, " [%02i] %s(%s+0x%x) [0x%x]\n",
wp->counter, dli.dli_fname, dli.dli_sname, (int)((byte *)pc - (byte *)dli.dli_saddr), (uint)pc);
} else {
*wp->bufptr += seprintf(*wp->bufptr, wp->last, " [%02i] [0x%x]\n", wp->counter, (uint)pc);
}
wp->counter++;
return 0;
}
#endif
char *LogStacktrace(char *buffer, const char *last) const override
{
buffer += seprintf(buffer, last, "Stacktrace:\n");
#if defined(__GLIBC__)
void *trace[64];
int trace_size = backtrace(trace, lengthof(trace));
char **messages = backtrace_symbols(trace, trace_size);
for (int i = 0; i < trace_size; i++) {
buffer += seprintf(buffer, last, " [%02i] %s\n", i, messages[i]);
}
free(messages);
#elif defined(SUNOS)
ucontext_t uc;
if (getcontext(&uc) != 0) {
buffer += seprintf(buffer, last, " getcontext() failed\n\n");
return buffer;
}
StackWalkerParams wp = { &buffer, last, 0 };
walkcontext(&uc, &CrashLogUnix::SunOSStackWalker, &wp);
#else
buffer += seprintf(buffer, last, " Not supported.\n");
#endif
return buffer + seprintf(buffer, last, "\n");
}
public:
/**
* A crash log is always generated by signal.
* @param signum the signal that was caused by the crash.
*/
CrashLogUnix(int signum) :
signum(signum)
{
}
};
/** The signals we want our crash handler to handle. */
static const int _signals_to_handle[] = { SIGSEGV, SIGABRT, SIGFPE, SIGBUS, SIGILL };
/**
* Entry point for the crash handler.
* @note Not static so it shows up in the backtrace.
* @param signum the signal that caused us to crash.
*/
static void CDECL HandleCrash(int signum)
{
/* Disable all handling of signals by us, so we don't go into infinite loops. */
for (const int *i = _signals_to_handle; i != endof(_signals_to_handle); i++) {
signal(*i, SIG_DFL);
}
if (GamelogTestEmergency()) {
printf("A serious fault condition occurred in the game. The game will shut down.\n");
printf("As you loaded an emergency savegame no crash information will be generated.\n");
abort();
}
if (SaveloadCrashWithMissingNewGRFs()) {
printf("A serious fault condition occurred in the game. The game will shut down.\n");
printf("As you loaded an savegame for which you do not have the required NewGRFs\n");
printf("no crash information will be generated.\n");
abort();
}
CrashLogUnix log(signum);
log.MakeCrashLog();
CrashLog::AfterCrashLogCleanup();
abort();
}
/* static */ void CrashLog::InitialiseCrashLog()
{
for (const int *i = _signals_to_handle; i != endof(_signals_to_handle); i++) {
signal(*i, HandleCrash);
}
}
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