gistfile1.txt

// ... (previous code remains the same)

void* check_stop_file(void* arg) {
    while (!stop_requested) {
        if (access(STOP_FILE, F_OK) != -1) {
            // Stop file exists, set the stop flag
            stop_requested = 1;
            break;
        }
        // Sleep for a short interval before checking again
        usleep(100000); // Sleep for 100ms
    }
    return NULL;
}

int main(int argc, char **argv) {
    // ... (previous code remains the same)

    // Create a thread to check for the STOP file
    pthread_t stop_thread;
    pthread_create(&stop_thread, NULL, check_stop_file, NULL);

    // Main loop to process messages from the pipe
    while (!stop_requested) {
        // ... (main loop code remains the same)
    }

    // Wait for the stop thread to finish
    pthread_join(stop_thread, NULL);

    // ... (remaining code remains the same)
}