void _proxy_log(log_level_t level, const char *fmt, ...)
    __attribute__((format (printf, 2, 3)));

#define proxy_log(level, fmt, ...) _proxy_log(level, fmt"\n", ##__VA_ARGS__)

void _proxy_log(log_level_t level, const char *fmt, ...) {
    va_list arg;
    FILE *log_file = (level == LOG_ERROR) ? err_log : info_log;

    /* Check if the message should be logged */
    if (level > log_level)
        return;

    /* Write the error message */
    va_start(arg, fmt);
    vfprintf(log_file, fmt, arg);
    va_end(arg);

#ifdef DEBUG
    fflush(log_file);
    fsync(fileno(log_file));
#endif
}