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/*
* File: crash-u.cc
* Summary: UNIX specific crash handling functions.
* Written by: Matthew Cline
*/
#include "AppHdr.h"
#ifdef USE_UNIX_SIGNALS
#include <signal.h>
#endif
#if defined(UNIX)
#define BACKTRACE_SUPPORTED
#endif
#ifdef BACKTRACE_SUPPORTED
#if defined(TARGET_CPU_MIPS) || \
defined(TARGET_OS_FREEBSD) || \
defined(TARGET_OS_NETBSD) || \
defined(TARGET_OS_OPENBSD) || \
defined(TARGET_COMPILER_CYGWIN)
#undef BACKTRACE_SUPPORTED
#endif
#endif
#ifdef BACKTRACE_SUPPORTED
#include <cxxabi.h>
#if !defined(TARGET_OS_MACOSX) && \
!defined(TARGET_OS_WINDOWS) && \
!defined(TARGET_COMPILER_CYGWIN)
#include <execinfo.h>
#endif
#ifdef TARGET_OS_MACOSX
#include <dlfcn.h>
typedef int (*backtrace_t)(void * *, int);
typedef char **(*backtrace_symbols_t)(void * const *, int);
// Used to convert from void* to function pointer (without a
// compiler warning).
template <typename TO, typename FROM> TO nasty_cast(FROM f) {
union {
FROM f; TO t;
} u; u.f = f; return u.t;
}
#endif // TARGET_OS_MACOSX
#endif // defined(UNIX) || defined(TARGET_OS_MACOSX)
#include "crash.h"
#include "dbg-crsh.h"
#include "externs.h"
#include "options.h"
#include "state.h"
#include "stuff.h"
#include "initfile.h"
/////////////////////////////////////////////////////////////////////////////
// Code for printing out debugging info on a crash.
////////////////////////////////////////////////////////////////////////////
#ifdef USE_UNIX_SIGNALS
static int _crash_signal = 0;
static int _recursion_depth = 0;
static void _crash_signal_handler(int sig_num)
{
if (crawl_state.game_crashed)
{
if (_recursion_depth > 0)
return;
_recursion_depth++;
fprintf(stderr, "Recursive crash." EOL);
std::string dir = (!Options.morgue_dir.empty() ? Options.morgue_dir :
!SysEnv.crawl_dir.empty() ? SysEnv.crawl_dir
: "");
if (!dir.empty() && dir[dir.length() - 1] != FILE_SEPARATOR)
dir += FILE_SEPARATOR;
char name[180];
sprintf(name, "%scrash-recursive-%s-%s.txt", dir.c_str(),
you.your_name.c_str(), make_file_time(time(NULL)).c_str());
FILE* file = fopen(name, "w");
if (file == NULL)
file = stderr;
write_stack_trace(file, 0);
if (file != stderr)
fclose(file);
return;
}
_crash_signal = sig_num;
crawl_state.game_crashed = true;
// In case the crash dumper is unable to open a file and has to dump
// to stderr.
#ifndef USE_TILE
unixcurses_shutdown();
#endif
do_crash_dump();
// Now crash for real.
signal(sig_num, SIG_DFL);
raise(sig_num);
}
#endif
void init_crash_handler()
{
#if defined(USE_UNIX_SIGNALS)
for (int i = 1; i <= 64; i++)
{
#ifdef SIGHUP_SAVE
if (i == SIGHUP)
continue;
#endif
#ifdef SIGQUIT
if (i == SIGQUIT)
continue;
#endif
#ifdef SIGINT
if (i == SIGINT)
continue;
#endif
#ifdef SIGCHLD
if (i == SIGCHLD)
continue;
#endif
#ifdef SIGTSTP
if (i == SIGTSTP)
continue;
#endif
#ifdef SIGCONT
if (i == SIGCONT)
continue;
#endif
#ifdef SIGIO
if (i == SIGIO)
continue;
#endif
#ifdef SIGPROF
if (i == SIGPROF)
continue;
#endif
#ifdef SIGTTOU
if (i == SIGTTOU)
continue;
#endif
#ifdef SIGTTIN
if (i == SIGTTIN)
continue;
#endif
if (i == SIGWINCH)
continue;
signal(i, _crash_signal_handler);
}
#endif // if defined(USE_UNIX_SIGNALS)
}
void dump_crash_info(FILE* file)
{
#if defined(UNIX)
const char *name = strsignal(_crash_signal);
if (name == NULL)
name = "INVALID";
fprintf(file, "Crash caused by signal #%d: %s" EOL EOL, _crash_signal,
name);
#endif
}
#if defined(BACKTRACE_SUPPORTED)
void write_stack_trace(FILE* file, int ignore_count)
{
void* frames[50];
#if defined (TARGET_OS_MACOSX)
backtrace_t backtrace;
backtrace_symbols_t backtrace_symbols;
backtrace = nasty_cast<backtrace_t, void*>(dlsym(RTLD_DEFAULT, "backtrace"));
backtrace_symbols = nasty_cast<backtrace_symbols_t, void*>(dlsym(RTLD_DEFAULT, "backtrace_symbols"));
if (!backtrace || !backtrace_symbols)
{
fprintf(stderr, "Couldn't get a stack trace." EOL);
fprintf(file, "Couldn't get a stack trace." EOL);
return;
}
#endif
int num_frames = backtrace(frames, ARRAYSZ(frames));
char **symbols = backtrace_symbols(frames, num_frames);
#if !defined(TARGET_OS_MACOSX)
if (symbols == NULL)
{
fprintf(stderr, "Out of memory." EOL);
fprintf(file, "Out of memory." EOL);
// backtrace_symbols_fd() can print out the stack trace even if
// malloc() can't find any free memory.
backtrace_symbols_fd(frames, num_frames, fileno(file));
return;
}
#endif
fprintf(file, "Obtained %d stack frames." EOL, num_frames);
// Now we prettify the printout to even show demangled C++ function names.
std::string bt = "";
for (int i = 0; i < num_frames; i++)
{
#if defined (TARGET_OS_MACOSX)
char *addr = ::strstr(symbols[i], "0x");
char *mangled = ::strchr(addr, ' ') + 1;
char *offset = ::strchr(addr, '+');
char *postmangle = ::strchr(mangled, ' ');
if (mangled)
*(mangled - 1) = 0;
bt += addr;
int status;
bt += ": ";
if (addr && mangled)
{
if (postmangle)
*postmangle = '\0';
char *realname = abi::__cxa_demangle(mangled, 0, 0, &status);
if (realname)
bt += realname;
else
bt += mangled;
bt += " ";
bt += offset;
free(realname);
}
#else // TARGET_OS_MACOSX
bt += symbols[i];
int status;
// Extract the identifier from symbols[i]. It's inside of parens.
char *firstparen = ::strchr(symbols[i], '(');
char *lastparen = ::strchr(symbols[i], '+');
if (firstparen != 0 && lastparen != 0 && firstparen < lastparen)
{
bt += ": ";
*lastparen = '\0';
char *realname = abi::__cxa_demangle(firstparen + 1, 0, 0, &status);
if (realname != NULL)
bt += realname;
free(realname);
}
#endif
bt += EOL;
}
fprintf(file, "%s", bt.c_str());
free(symbols);
}
#else // defined(UNIX)
void write_stack_trace(FILE* file, int ignore_count)
{
const char* msg = "Unable to get stack trace on this platform." EOL;
fprintf(stderr, "%s", msg);
fprintf(file, "%s", msg);
}
#endif
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