int main(int argc, char **argv)
{
	const int PORT=1234;
	const int BACKLOG=256;
	const int INET_ADDRLEN=256;
	const int BUFFER_SIZE=256;
	
	int fd,fd2,rec_size,pr;
	unsigned int sin_size=sizeof(sockaddr_in);
	char buffer[BUFFER_SIZE];
	sockaddr_in server,client;
	char ip_handled[INET_ADDRLEN];
	
	if((fd=socket(AF_INET,SOCK_STREAM,0))==-1){
		exit(-1);
	}
	
	server.sin_family=AF_INET;
	server.sin_port=htons(PORT);
	server.sin_addr.s_addr=INADDR_ANY;
	for(int i=0;i<8;i++) server.sin_zero[i]=0;
	
	if((bind(fd,(sockaddr *)&server,sizeof(sockaddr_in)))==-1){
		exit(-1);
	}
	
	if((listen(fd,BACKLOG))==-1){
		exit(-1);
	}
	while(1){
		printf("Listening...\n");
		if((fd2=accept(fd,(sockaddr *)&client,&sin_size))==-1){
			printf("Error en accept()\n");
			close(fd);
			exit(-1);
		}else{
			pr=fork();
			switch(pr){
				case -1:
					cout<<"Critical Error"<<endl;
					close(fd);
					close(fd2);
					exit(-1);
					break;
				case 0:
					printf("Client lstened \n");
					if(inet_ntop(AF_INET,&(client.sin_addr),ip_handled,INET_ADDRLEN)==NULL){
						printf("Error en inet_ntop()\n");
						close(fd);
						close(fd2);
						exit(-1);
					}else{
						printf("Handling client %s at port %d\n",ip_handled,ntohs(client.sin_port));
					}
					if((rec_size=recv(fd2,buffer,BUFFER_SIZE,0))==-1){
						printf("Error en lectura\n");
						close(fd);
						close(fd2);
						exit(-1);
					}
					while(strcmp(buffer,"-1")!=0){
						printf("Mensaje recivido: \n\t%s\n",buffer);
						if(send(fd2,buffer,rec_size,0)==-1){
							printf("Error en escritura\n");
						}
						if((rec_size=recv(fd2,buffer,BUFFER_SIZE,0))==-1){
							printf("Error en lectura\n");
							close(fd);
							close(fd2);
							exit(-1);
						}
					}
					exit(0);
					break;
				default:
					break;
			}
		}
	}
	exit(0);
}