man 2 gettimeofday 翻译
名字gettimeofday, settimeofday - get / set time概要#include <sys/time.h>int gettimeofday(struct timeval *tv, struct timezone *tz);int settimeofday(const struct timeval *tv, const struct timezone *tz);glibc需要的特征测试宏(查看 feature_test_macros(7))