#define log_pet(level, dlv, format, args ...) \
    do { \
        if (log_level >= level) \
            syslog(dlv, "<%s:%d:%s> " format, __FILE__, __LINE__, __FUNCTION__, ##args); \
    } while (0)


或

#define log_pet(level, dlv, format, ...) \
    do { \
        if (log_level >= level) \
            syslog(dlv, "<%s:%d:%s> " format, __FILE__, __LINE__, __FUNCTION__,  ##__VA_ARGS__); \
    } while (0)