Linux 下c获取当前时间戳（精确到秒和毫秒或者微秒或者纳秒）

t.c源码： #include <stdlib.h>#include <stdio.h>#include <sys/time.h>#include <unistd.h>int main(){ s

t.c源码：

#include <stdlib.h>#include <stdio.h>#include <sys/time.h>#include <unistd.h>int main(){    struct timeval tv;    gettimeofday(&tv,NULL);    printf("second:%ld/n",tv.tv_sec);  //秒    printf("millisecond:%ld/n",tv.tv_sec*1000 + tv.tv_usec/1000);  //毫秒    printf("microsecond:%ld/n",tv.tv_sec*1000000 + tv.tv_usec);  //微秒    sleep(3); // 为方便观看，让程序睡三秒后对比    printf("------------------------------/n");    gettimeofday(&tv,NULL);    printf("second:%ld/n",tv.tv_sec);  //秒    printf("millisecond:%ld/n",tv.tv_sec*1000 + tv.tv_usec/1000);  //毫秒    printf("microsecond:%ld/n",tv.tv_sec*1000000 + tv.tv_usec);  //微秒    return 0;}

运行：

$ ./t second:1501000012millisecond:1501000012738microsecond:1501000012738594------------------------------second:1501000015millisecond:1501000015738microsecond:1501000015738717

 

--- 获取纳秒级别的 ---

t1.c源码：

#include<stdio.h>#include<stdlib.h>#include<time.h>int main(void){    struct timespec time_start={0, 0},time_end={0, 0};    clock_gettime(CLOCK_REALTIME, &time_start);    printf("start time %llus,%llu ns/n", time_start.tv_sec, time_start.tv_nsec);    clock_gettime(CLOCK_REALTIME, &time_end);    printf("endtime %llus,%llu ns/n", time_end.tv_sec, time_end.tv_nsec);    printf("duration:%llus %lluns/n", time_end.tv_sec-time_start.tv_sec, time_end.tv_nsec-time_start.tv_nsec);    return 0;}

编译：

gcc -o t1 t1.c -lrt

运行：

$ ./t1 start time 1501001451s,320841750 nsendtime 1501001451s,320881827 nsduration:0s 40077ns