{

/// catch segment fault action

struct sigaction sa;

sigemptyset(&sa.sa_mask);

sa.sa_sigaction = Backtrace::HandleErrorSignal;

sa.sa_flags = SA_SIGINFO;

for (auto iter = signals.begin(); iter != signals.end(); ++iter)

sigaction(*iter, &sa, nullptr);

{

(void) signal_info;

(void) arg;

std::cerr << "catch signal:" << signal_number << ", call-stack dumped:" << std::endl;

std::string dumpinfo = Backtrace::DumpCallStack(Backtrace::instance().max_frames_, Backtrace::instance().skip_frames_);

std::cerr << dumpinfo << std::endl;

_exit(signal_number);

{

char buf[1024];

Dl_info info;

void *callstack[max_frames];

std::ostringstream oss;

unsigned int number_frames = ::backtrace(callstack, max_frames);

char **symbols = ::backtrace_symbols(callstack, number_frames);

constexpr const char *BACKTRACE_FORMAT = "[%d]: %s <%p>"; // callstack number | address | symbols

for (unsigned int i = skip_frames; i < number_frames; ++i) {

/// try to translate an address to symbolic information

if (dladdr(callstack[i], &info)) {

int status = -1;

char *demangled = abi::__cxa_demangle(info.dli_sname, NULL, 0, &status);

snprintf(buf, sizeof(buf), BACKTRACE_FORMAT, i, (status == 0 ? demangled : info.dli_sname), callstack[i]);

if (demangled != nullptr)

free(demangled);

} else {

snprintf(buf, sizeof(buf), BACKTRACE_FORMAT, i, (symbols != nullptr ? symbols[i] : "null"), callstack[i]);

}

oss << buf << std::endl;

}

if (symbols != nullptr)

free(symbols);

if (number_frames >= max_frames)

oss << "[truncated]" << std::endl;

return oss.str();