int create_serv(int sockfd,int port)
{
struct sockaddr_in srvaddr;
int on=1;

bzero(&srvaddr,sizeof(struct sockaddr));
srvaddr.sin_port=htons(port);
srvaddr.sin_family=AF_INET;
srvaddr.sin_addr.s_addr=htonl(INADDR_ANY);

setsockopt(sockfd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on)); //so I can rebind the port
if(bind(sockfd,(struct sockaddr *)&srvaddr,sizeof(struct sockaddr))<0){perror("error");return(0);}
if(listen(sockfd,CONNECT_NUMBER)<0){perror("listen error\n");return(0);}
return(1);
}

int client_connect(int sockfd,char* server,int port)
{
struct sockaddr_in cliaddr;
struct hostent *host;

if(!(host=gethostbyname(server))){printf("gethostbyname(%s) error:%s\n",server,strerror(errno));return(0);}

bzero(&cliaddr,sizeof(struct sockaddr));
cliaddr.sin_family=AF_INET;
cliaddr.sin_port=htons(port);
cliaddr.sin_addr=*((struct in_addr *)host->h_addr);

if(connect(sockfd,(struct sockaddr *)&cliaddr,sizeof(struct sockaddr))<0){perror("error");return(0);}
return(1);
}