Function faulthandler_dump_traceback

crates/stdlib/src/faulthandler.rs:279–296

(fd: i32, all_threads: bool)

    // faulthandler_dump_traceback (signal-safe, for fatal errors)
    #[cfg(any(unix, windows))]
    fn faulthandler_dump_traceback(fd: i32, all_threads: bool) {
        static REENTRANT: AtomicBool = AtomicBool::new(false);

        if REENTRANT.swap(true, Ordering::SeqCst) {
            return;
        }

        // Write thread header
        if all_threads {
            write_thread_id(fd, current_thread_id(), true);
        } else {
            puts(fd, "Stack (most recent call first):\n");
        }

        dump_live_frames(fd);

        REENTRANT.store(false, Ordering::SeqCst);
    }

    /// MAX_STRING_LENGTH in traceback.c
    const MAX_STRING_LENGTH: usize = 500;