/* CLISERVER - SERVER CONNESSION LESS SU INTERNET */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <signal.h>
#include <fcntl.h>
#include <stdio.h>

#define BUFSZ	256
#define DATA "012345678901234567890123456789..."

int ceposta();
int sock, sock, length, flength,i;
struct sockaddr_in name, fromname;
int buf[BUFSZ];


main()
{
 	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
		perror("server:socket");
		exit(1);
	}

	name.sin_family = AF_INET;
	name.sin_addr.s_addr = INADDR_ANY;
/*	name.sin_port =0;			*/
	name.sin_port =htons(2000);

	length = sizeof(name);
	
	fromname.sin_family = AF_INET;
	fromname.sin_addr.s_addr = INADDR_ANY;
	fromname.sin_port =0;
	flength = sizeof(fromname); 
		
	if (bind(sock, &name, sizeof name) < 0) {
		perror("server: bind");
		exit(1);
	}

 
 	signal(SIGIO, ceposta);

	if (fcntl(sock,F_SETOWN, getpid()) <0){
		perror("fcntl F_SETOWN");
		exit(1);
	}

	if (fcntl(sock,F_SETFL, FASYNC) <0){
		perror("fcntl FASYNC");
		exit(1);
	}


	printf("socket port #%d\n", ntohs(name.sin_port));

	i = 0;
	while (1) {
 	
	printf("\r%d",i);
 	}
	close(sock);

	exit(0);


}


int ceposta()

{ 	if (recvfrom(sock,buf, sizeof(buf),0, &fromname, &flength) <0)
		perror("receiving datagram pocket");
	buf[2]=++i;
 
 	if (sendto(sock,buf, sizeof(buf),0,
		(struct sockaddr*) &fromname, sizeof fromname) < 0)
		perror("sending datagram pocket");
    
}