Hello,
I am rather new to systems/network programming with C, but I want to get
better. So I have some questions. The background of my questions are these:
To send messages in a network, I have a TCP server without libuv using the
Socket API:
m_addr.sin_family = AF_INET;
m_addr.sin_port = htons(port);
m_addr.sin_addr.s_addr = htonl(INADDR_ANY);
My questions:
1) By using libuv and an event loop - I would save CPU resources (in
general) or just when there is no incoming request?
2) How to best declar the loop memory space (global and malloc from main or
do it in main directly?
uv_loop_t *loop = malloc(sizeof(uv_loop_t));
3) I wanted to build a basic libuv based socket server example. I succeeded
with building a libuv loop listening to idle events - when I try to go to a
TCP server example, the event loop does not seem to start. This is the code:
int main() {
// init loop
printf("init\n");
uv_loop_t *loop = malloc(sizeof(uv_loop_t));
uv_loop_init(loop);
// need handler
uv_idle_t idhandler;
uv_idle_init(loop, &idhandler);
uv_idle_start(&idhandler, wait_for_a_while);
#ifdef SERVERLOOP
// attach server to loop
printf("prepare tcp socket\n");
uv_tcp_t server;
uv_tcp_init(loop, &server);
printf("ip setup");
uv_ip4_addr("0.0.0.0", DEFAULT_PORT, &addr);
printf("setup port: %d", DEFAULT_PORT);
uv_tcp_bind(&server, (const struct sockaddr*)&addr, 0);
int r = uv_listen((uv_stream_t*) &server, DEFAULT_BACKLOG,
on_new_connection);
if (r) {
fprintf(stderr, "Listen error %s\n", uv_strerror(r));
return 1;
}
#endif
uv_run(loop, UV_RUN_DEFAULT);
uv_loop_close(loop);
free(loop);
return 0;
}
When I build this example with the SERVERLOOP define, the printf are not
shown. I suspect that the server hangs somewhere, but not sure.
What can I do to learn more on the uv loop if setup would work? Any
debugging statements? Maybe using gdb... ?
Thanks for your help!
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