Linux下获取毫秒级时间差

代码如下：

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

int main(int argc, char* argv[]){
  struct timeval struc_start, struc_end;
  long dif_time = 0;

  //get start time
  gettimeofday(&struc_start, NULL);
  long start = ((long)struc_start.tv_sec)*1000 +  (long)struc_start.tv_usec/1000;
  printf("\tstart time:%ld ms\n", start);

  sleep(10);
  
  //get end time
  gettimeofday(&struc_end, NULL);
  long end = ((long)struc_end.tv_sec)*1000 + (long)struc_end.tv_usec/1000;
  printf("\tend time:%ld ms\n", end);

  //calculate time slot
  dif_time = end - start;
  printf("\tdif time:%ld ms\n", dif_time);

 return 0;
}