Hello,
I have a server which waits for incoming connections, and I want the
client to connect to the server, and immediately send over a port
number. In the client's main() I do this:
--------------------------------------------------------
(void)memset(&sin, 0, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(0x7f000001);
sin.sin_port = htons(server_tcp_port);
(void)memset(&ls, 0x00, sizeof(ls));
bev = bufferevent_socket_new(base, -1, BEV_OPT_CLOSE_ON_FREE);
bufferevent_setcb(bev, readcb, writecb, eventcb, &ls);
if(bufferevent_socket_connect(bev, (struct sockaddr*)&sin,
sizeof(sin)) < 0) {
/* Error starting connection */
bufferevent_free(bev);
return 1;
}
bufferevent_enable(bev, EV_READ|EV_WRITE);
--------------------------------------------------------
The eventcb looks like this:
--------------------------------------------------------
void eventcb(struct bufferevent *bev, short events, void *ptr)
{
if(events & BEV_EVENT_CONNECTED) {
puts("Connected!");
} else if(events & BEV_EVENT_ERROR) {
/* An error occured while connecting. */
puts("ERROR!");
}
}
--------------------------------------------------------
..and I have:
--------------------------------------------------------
void writecb(struct bufferevent *bev, void *ctx)
{
linkstate_t *ls = ctx;
printf("Write!\n");
if(ls->sent_port == 0) {
unsigned short nport = htons(tcp_listen_port);
bufferevent_write(bev, &nport, sizeof(nport));
bufferevent_flush(bev, EV_WRITE, BEV_FLUSH);
puts("Disabling write");
bufferevent_disable(bev, EV_WRITE);
ls->sent_port = 1;
}
}
void readcb(struct bufferevent *bev, void *ctx)
{
linkstate_t *ls = ctx;
printf("Read!\n");
}
--------------------------------------------------------
The server reports that a client has connected to it, and the client
does print "Connected!" in eventcb(). But the client never prints "Write!".
Rather than use a writecb(), I tried calling bufferevent_write() just
after the bufferevent_socket_connect(), but the data didn't reach the
server, which I found to be slightly peculiar.
It's clear I've misunderstood something pretty fundamental about
bufferevents .. but what?
--
Kind regards,
Jan Danielsson
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