Ok, at least my example seem to work onw.
As usual, when writing things down, ithe problem seem to go away by
itself...
Anyway, maybe someone has general comments on working with libuv for
building servers.
On Friday, January 10, 2020 at 11:48:27 AM UTC+1, patrick wrote:
>
> 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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