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/*
* File: crash-u.cc
* Summary: UNIX specific crash handling functions.
* Written by: Matthew Cline
*
* Modified for Crawl Reference by $Author$ on $Date$
*/
#include "AppHdr.h"
REVISION("$Rev$");
#ifdef USE_UNIX_SIGNALS
#include <signal.h>
#endif
#ifdef __GLIBC__
#include <execinfo.h>
#endif
#include "crash.h"
#include "externs.h"
#include "state.h"
#include "initfile.h"
/////////////////////////////////////////////////////////////////////////////
// Code for printing out debugging info on a crash.
////////////////////////////////////////////////////////////////////////////
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-%d.txt", dir.c_str(),
you.your_name, (int) time(NULL));
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);
}
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
if (i == SIGWINCH)
continue;
signal(i, _crash_signal_handler);
}
#endif // if defined(USE_UNIX_SIGNALS)
}
void dump_crash_info(FILE* file)
{
const char *name = strsignal(_crash_signal);
if (name == NULL)
name = "INVALID";
fprintf(file, "Crash caused by signal #%d: %s" EOL EOL, _crash_signal,
name);
}
#ifdef __GLIBC__
// NOTE: This should work on OS X, according to
// http://developer.apple.com/DOCUMENTATION/DARWIN/Reference/ManPages/man3/backtrace_symbols.3.html
void write_stack_trace(FILE* file, int ignore_count)
{
void* frames[50];
int num_frames = backtrace(frames, ARRAYSZ(frames));
char **symbols = backtrace_symbols(frames, num_frames);
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;
}
for (int i = ignore_count; i < num_frames; i++)
{
fprintf(file, "%s" EOL, symbols[i]);
}
free(symbols);
}
#else // ifdef __GLIBC__
void write_stack_trace(FILE* file, int ignore_count)
{
const char* msg = "Unable to get stack trace on this platform." EOL;
fprintf(stderr, msg);
fprintf(file, msg);
}
#endif
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