// Clnt.C:  Experiment with pth and I/O, paired with Svr.C. 

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>

main(int argc, char **argv)

{  int SD,MsgSize;
   struct sockaddr_in Addr;
   struct hostent *HostPtr;
   int N;
   int Port;

   Port = atoi(argv[2]);

   /* open a socket */
   SD = socket(AF_INET,SOCK_STREAM,0);

   /* set up for an Internet connection to the host whose 
      name was specified by the user on the command line */
   Addr.sin_family = AF_INET;
   Addr.sin_port = Port;
   /* get IP address of host */
   HostPtr = gethostbyname(argv[1]);
   memcpy(&Addr.sin_addr.s_addr,
      HostPtr->h_addr_list[0],HostPtr->h_length);

   /* OK, now connect */
   if (connect(SD,(sockaddr *) &Addr,sizeof(Addr)) < 0) perror(NULL);

   while (1)  {
      scanf("%d",&N);
      write(SD,&N,1);
      read(SD,&N,1);
      printf("%d\n",N);
   }

}