Linux获取时间函数及计算时间差(二)

? ? ? time_t mktime(struct tm *tm);

? ? ? double difftime(time_t time1, time_t time0);

? ? ? int gettimeofday(struct timeva l *tv, struct timezone *tz);

? ? ? int settimeofday(const struct timeva l *tv , const struct timezone *tz);