sources/int/net/ip/t.c

   1 # include       <stdio.h>
   2 # include       <string.h>
   3 # include       <stdlib.h>
   4 # include       <sys/types.h>
   5 # include       <signal.h>
   6 # include       <sys/socket.h>
   7 # include       <sys/time.h>
   8 # include       <netinet/in.h>
   9 # include       <netdb.h>
  10 # include       <errno.h>
  11
  12
  13 int main(){
  14
  15    int i=0;
  16    long diff;
  17    struct timeval time_before,time_after;
  18
  19    if( gettimeofday(&time_before,NULL) ){
  20       perror("gettimeofday:");
  21       exit(1);
  22    }
  23
  24    for(;;i++){
  25
  26       if( gettimeofday(&time_after ,NULL) ){
  27          perror("gettimeofday:");
  28          exit(1);
  29       }
  30
  31       diff  = (time_after.tv_sec - time_before.tv_sec)*1000;
  32       diff -= time_before.tv_usec/1000;
  33       diff += time_after .tv_usec/1000;
  34
  35       if( diff < 0 ){
  36          printf("%d-th operation took %d ms\n",i,diff);
  37          fflush(stdout);
  38          i=0;
  39       }
  40
  41 /*      printf("time now %d s %d us\n",time_after.tv_sec,time_after.tv_usec);
  42 */
  43       fflush(stdout);
  44
  45       time_before = time_after;
  46
  47    }
  48
  49    return 0;
  50 }
  51