ping的c實現

void send_packet()
{       int packetsize;
       while( nsend<MAX_NO_PACKETS)
       {       nsend++;
               packetsize=pack(nsend); /*設置ICMP報頭*/
               if( sendto(sockfd,sendpacket,packetsize,0,
                         (struct sockaddr *)&dest_addr,sizeof(dest_addr) )<0  )
               {       perror("sendto error");
                       continue;
               }
               sleep(1); /*每隔一秒發送一個ICMP報文*/
       }
}

/*接收所有ICMP報文*/
void recv_packet()
{       int n,fromlen;
       extern int errno;

       signal(SIGALRM,statistics);
       fromlen=sizeof(from);
       while( nreceived<nsend)
       {       alarm(MAX_WAIT_TIME);

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