Linux C 时间和定时器

最新推荐文章于 2025-10-21 16:06:52 发布

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最新推荐文章于 2025-10-21 16:06:52 发布 · 480 阅读

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#linux #c语言

当前时间

#include <stdio.h>
#include <time.h>
#include <sys/time.h>

int main()
{
   
   
    //<time.h> 精度s
    time_t now = time(NULL);
    printf("current time: %lds\n", now);

    //<sys/time.h> 精度us
    struct timeval tval;
    gettimeofday(&tval, NULL);
    printf("current time: %lds %ldus\n", tval.tv_sec, tval.tv_usec);

    //<time.h> 精度ns
    struct timespec res;
    clock_gettime(CLOCK_REALTIME, &res);
    printf("current time: %lds %ldns\n", res.tv_sec, res.tv_nsec);

    //<time.h> 讲time_t转换为struct tm
    struct tm* t = localtime(&now);
    printf("current time: %d/%d/%d %d:%d:%ds\n",
        t->tm_year + 1900, t->