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linux获取时间api
1:gettimeofday();
2:time()
3:localtime_r()
4:settimeofday()
对应接口定义可以使用man查看
头文件include<sys/time>
或者include<time>
例子：
int main()
{
struct timeval tv;
gettimeofday(&tv,NULL);
printf(“sec:%ld,usec:%ld”,tv.tv_sec,tv.tv_usec);//微秒
}
例子设置时间
void setsystime(unsigned char hour, unsigned char min, unsigned char sec)
{
time_t timep;
struct tm stTime;
struct timeval tv;
time(&timep);
localtime_r(&timep;&stTime);
stTime.tm_hour = hour;
stTime.tm_min = min;
stTime.tm_sec = sec;
tv.tv_sec = (long)mktime(&stTime);
tv.tv_usec = 0;
settimeofday(&tv, (struct timezone*)0);
}
获取系统时间
int getsystime(unsigned char *hour, unsigned char *min, unsigned char *sec)
{
if((NULL == hour)||(NULL == min)||(NULL == sec))
{
return -1;
}
time_t timep;
struct tm tmnow;
time(&timep);
localtime_r(&timep,&tmnow);
*sec = (unsigned char)tmnow.tm_sec;
*min = (unsigned char)tmnow.tm_min;
*hour = (unsigned char)tmnow.tm_hour;
return 0;
}
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