ping的c實現

       /*確保所接收的是我所發的的ICMP的回應*/
       if( (icmp->icmp_type==ICMP_ECHOREPLY) && (icmp->icmp_id==pid) )
       {       tvsend=(struct timeval *)icmp->icmp_data;
               tv_sub(&tvrecv,tvsend);  /*接收和發送的時間差*/
               rtt=tvrecv.tv_sec*1000+tvrecv.tv_usec/1000;  /*以毫秒為單位計算rtt*/
               /*顯示相關信息*/
               printf("%d byte from %s: icmp_seq=%u ttl=%d rtt=%.3f ms\n",
                       len,
                       .net_ntoa(from.sin_addr),
                       icmp->icmp_seq,
                       ip->ip_ttl,
                       rtt);
       }
       else    return -1;
}

main(int argc,char *argv[])
{       struct hostent *host;
       struct protoent *protocol;
       unsigned long inaddr=0l;
       int waittime=MAX_WAIT_TIME;
       int size=50*1024;

       if(argc<2)
       {       printf("usage:%s hostname/IP address\n",argv[0]);
               exit(1);
       }

       if( (protocol=getprotobyname("icmp") )==NULL)
       {       perror("getprotobyname");
               exit(1);

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