How to call bufferevent_write several times? - c

Question

I am a newbie in libevent, my program below is quite simple. I want to call bubufferevent_write several times, but is seems that it works only for the 1st time.
int main(int argc, char const *argv[])
{
struct sockaddr_in serv_addr;
struct hostent *server;
int portno = atoi(argv[2]);
server = gethostbyname(argv[1]);
if (server == NULL) {
fprintf(stderr,"ERROR, no such host\n");
}
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sin_family = AF_INET;
bcopy((char *)server->h_addr, (char *)&serv_addr.sin_addr.s_addr, server->h_length);
serv_addr.sin_port = htons(portno);
struct event_base* base = event_base_new();
evutil_socket_t fd;
fd = socket(AF_INET, SOCK_STREAM, 0);
struct bufferevent* con_conn = bufferevent_socket_new(base,fd,BEV_OPT_CLOSE_ON_FREE);
bufferevent_setcb(con_conn,NULL,NULL,NULL,NULL);
bufferevent_enable(con_conn,EV_READ|EV_WRITE|EV_PERSIST);
bufferevent_socket_connect(con_conn,(struct sockaddr*)&serv_addr,sizeof(struct sockaddr_in));
int enable = 1;
if(setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, (void*)&enable, sizeof(enable)) < 0)
printf("TCP_NODELAY SETTING ERROR!\n");
char data[5] = "sss";
int i;
for (i = 0; i < 2; ++i)
{
int rc = bufferevent_write(con_conn,data,5);
printf("rc is %d\n", rc);
}
event_base_dispatch(base);
return 0;
}
My server side:
void error(char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno, clilen;
char buffer[256];
struct sockaddr_in serv_addr, cli_addr;
int n;
if (argc < 2) {
fprintf(stderr,"ERROR, no port provided\n");
//exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr,
sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
printf("waiting...\n");
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
sleep(5);
bzero(buffer,256);
n = read(newsockfd,buffer,255);
if (n < 0) error("ERROR reading from socket");
printf("Here is the message: %s\n",buffer);
return 0;
}