Method signal_handler_callback

tests/crash_handler_win.h:616–653

    }

    static void signal_handler_callback(int sig) {
        // Prevent recursion if handler crashes
        static volatile sig_atomic_t already_dumping = 0;
        if (already_dumping) {
            signal(sig, SIG_DFL);
            raise(sig);
            return;
        }
        already_dumping = 1;

        auto& self = instance();
        self.begin_crash_dump();

        printf("\n=== INTERNAL CRASH HANDLER (SIGNAL) ===\n");
        fprintf(stderr, "Error: signal %d:\n", sig);

        switch (sig) {
            case SIGABRT: printf("Signal: SIGABRT (Abort)\n"); break;
            case SIGFPE:  printf("Signal: SIGFPE (Floating Point Exception)\n"); break;
            case SIGILL:  printf("Signal: SIGILL (Illegal Instruction)\n"); break;
            case SIGINT:  printf("Signal: SIGINT (Interrupt)\n"); break;
            case SIGSEGV: printf("Signal: SIGSEGV (Segmentation Fault)\n"); break;
            case SIGTERM: printf("Signal: SIGTERM (Termination)\n"); break;
            default:      printf("Signal: Unknown (%d)\n", sig); break;
        }

        self.print_stacktrace_windows();
        printf("=== END INTERNAL HANDLER ===\n\n");

        self.end_crash_dump();

        printf("Uninstalling crash handler and re-raising signal %d for external debugger...\n", sig);
        fflush(stdout);

        signal(sig, SIG_DFL);
        raise(sig);
        exit(1);
    }

    // --- Setup ---