/*
 * Example of client using TCP protocol.
 */

 #ifdef __WIN32__

#include <winsock2.h>

#else

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

#endif
#include <stdio.h>
#include <sys/types.h>

#include "message.h"

// #define SERV_HOST_ADDR "156.12.23.5"
//#define SERV_HOST_ADDR "156.12.1.120"
#define SERV_HOST_ADDR "156.12.127.18"
/* pooh's Internet address, defined in /etc/hosts */


main(argc, argv)
int argc;
char *argv[];
{
    int sockfd, i;
    struct sockaddr_in serv_addr;
    int SERV_TCP_PORT;
    char *pname;
    MES mes_out, mes_in, tmp;

    printf("Please input the same integer input to the ser program\n");
    printf("  (which is larger than 1023)\n");
    scanf("%d", &SERV_TCP_PORT);

    pname = argv[0];

    /* create a socket which is one end of a communication channel */
    if((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0)
    { perror("client: cannot open stream socket"); exit(1);  }

    /* specify server address */
//    bzero((char *) &serv_addr, sizeof(serv_addr));
    memset((char *) &serv_addr,0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;  /* address family: Internet */
    serv_addr.sin_addr.s_addr = inet_addr(SERV_HOST_ADDR);
    serv_addr.sin_port = htons(SERV_TCP_PORT);

    /* connect the socket, sockfd, to the ser program.  */
    if(connect(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
      { perror("client: cannot connect to server"); exit(2);  }

    mes_out.mtype = htonl(getpid());

    for(i=0; i<10; i++) 
      {
	mes_out.number = htonl(i);

	if(write(sockfd, &mes_out, sizeof(MES)) == -1)
	  { perror("client: write"); exit(3); }

	if(read(sockfd, &tmp, sizeof(MES)) == -1)
	  { perror("server: read"); exit(4); }

	mes_in.mtype = ntohl(tmp.mtype);
	mes_in.number = ntohl(tmp.number);
	fprintf(stderr, "client %d output: %d %d\n",
		getpid(), mes_in.mtype, mes_in.number);
	sleep(1);
      }
    
    close(sockfd);
    exit(0);
}