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comparison third_party/libuv/docs/code/dns/main.c @ 160:948de3f54cea

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[ThirdParty] Added libuv
author June Park <parkjune1995@gmail.com>
date Wed, 14 Jan 2026 19:39:52 -0800
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159:05cf9467a1c3 160:948de3f54cea
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <uv.h>
5
6 uv_loop_t *loop;
7
8 void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
9 buf->base = malloc(suggested_size);
10 buf->len = suggested_size;
11 }
12
13 void on_read(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf) {
14 if (nread < 0) {
15 if (nread != UV_EOF)
16 fprintf(stderr, "Read error %s\n", uv_err_name(nread));
17 uv_close((uv_handle_t*) client, NULL);
18 free(buf->base);
19 free(client);
20 return;
21 }
22
23 char *data = (char*) malloc(sizeof(char) * (nread+1));
24 data[nread] = '\0';
25 strncpy(data, buf->base, nread);
26
27 fprintf(stderr, "%s", data);
28 free(data);
29 free(buf->base);
30 }
31
32 void on_connect(uv_connect_t *req, int status) {
33 if (status < 0) {
34 fprintf(stderr, "connect failed error %s\n", uv_err_name(status));
35 free(req);
36 return;
37 }
38
39 uv_read_start((uv_stream_t*) req->handle, alloc_buffer, on_read);
40 free(req);
41 }
42
43 void on_resolved(uv_getaddrinfo_t *resolver, int status, struct addrinfo *res) {
44 if (status < 0) {
45 fprintf(stderr, "getaddrinfo callback error %s\n", uv_err_name(status));
46 return;
47 }
48
49 char addr[17] = {'\0'};
50 uv_ip4_name((struct sockaddr_in*) res->ai_addr, addr, 16);
51 fprintf(stderr, "%s\n", addr);
52
53 uv_connect_t *connect_req = (uv_connect_t*) malloc(sizeof(uv_connect_t));
54 uv_tcp_t *socket = (uv_tcp_t*) malloc(sizeof(uv_tcp_t));
55 uv_tcp_init(loop, socket);
56
57 uv_tcp_connect(connect_req, socket, (const struct sockaddr*) res->ai_addr, on_connect);
58
59 uv_freeaddrinfo(res);
60 }
61
62 int main() {
63 loop = uv_default_loop();
64
65 struct addrinfo hints;
66 hints.ai_family = PF_INET;
67 hints.ai_socktype = SOCK_STREAM;
68 hints.ai_protocol = IPPROTO_TCP;
69 hints.ai_flags = 0;
70
71 uv_getaddrinfo_t resolver;
72 fprintf(stderr, "irc.libera.chat is... ");
73 int r = uv_getaddrinfo(loop, &resolver, on_resolved, "irc.libera.chat", "6667", &hints);
74
75 if (r) {
76 fprintf(stderr, "getaddrinfo call error %s\n", uv_err_name(r));
77 return 1;
78 }
79 return uv_run(loop, UV_RUN_DEFAULT);
80 }