oold
commented
2 years ago This is not a help forum, but here's a minimal example of how to do it for one signal.
#include <backward.hpp>
#include <csignal>
#include <cstdlib>
#include <fstream>
// This is definitely not async-signal-safe. Let's hope it doesn't crash or hang.
void handler(int signo) {
if (std::ofstream file_stream("my_stacktrace.log", std::ios::trunc); file_stream.is_open()) {
file_stream << "Caught signal " << signo << ".\nTrace:\n";
backward::StackTrace st;
st.load_here(32);
backward::Printer p;
p.print(st, file_stream);
}
// Raise signal again. Should usually terminate the program.
std::raise(signo);
}
int main() {
// Repeat this for each signal you want to catch and log.
struct sigaction act {};
// Allow signal handler to re-raise signal and reset to default handler after entering.
act.sa_flags = SA_NODEFER | SA_RESETHAND;
act.sa_handler = &handler;
sigfillset(&act.sa_mask);
sigdelset(&act.sa_mask, SIGSEGV /* or other signal */);
if (sigaction(SIGSEGV /* or other signal */, &act, nullptr) == -1)
std::exit(EXIT_FAILURE);
int* invalid_ptr = nullptr;
*invalid_ptr = 0; // Cause SIGSEGV. Could also std::raise(SIGSEGV).
}
bombela
How to store back trace info to a file?
I want to store this segment fault info to a file, how to realize(or configuration) it ? Thanks!