1 #include <assert.h>
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <string.h>
5 #include <unistd.h>
6 #include <uv.h>
7
8 uv_loop_t *loop;
9 uv_pipe_t queue;
10
11 typedef struct {
12 uv_write_t req;
13 uv_buf_t buf;
14 } write_req_t;
15
free_write_req(uv_write_t * req)16 void free_write_req(uv_write_t *req) {
17 write_req_t *wr = (write_req_t*) req;
18 free(wr->buf.base);
19 free(wr);
20 }
21
alloc_buffer(uv_handle_t * handle,size_t suggested_size,uv_buf_t * buf)22 void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
23 buf->base = malloc(suggested_size);
24 buf->len = suggested_size;
25 }
26
echo_write(uv_write_t * req,int status)27 void echo_write(uv_write_t *req, int status) {
28 if (status) {
29 fprintf(stderr, "Write error %s\n", uv_err_name(status));
30 }
31 free_write_req(req);
32 }
33
echo_read(uv_stream_t * client,ssize_t nread,const uv_buf_t * buf)34 void echo_read(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf) {
35 if (nread > 0) {
36 write_req_t *req = (write_req_t*) malloc(sizeof(write_req_t));
37 req->buf = uv_buf_init(buf->base, nread);
38 uv_write((uv_write_t*) req, client, &req->buf, 1, echo_write);
39 return;
40 }
41
42 if (nread < 0) {
43 if (nread != UV_EOF)
44 fprintf(stderr, "Read error %s\n", uv_err_name(nread));
45 uv_close((uv_handle_t*) client, NULL);
46 }
47
48 free(buf->base);
49 }
50
on_new_connection(uv_stream_t * q,ssize_t nread,const uv_buf_t * buf)51 void on_new_connection(uv_stream_t *q, ssize_t nread, const uv_buf_t *buf) {
52 if (nread < 0) {
53 if (nread != UV_EOF)
54 fprintf(stderr, "Read error %s\n", uv_err_name(nread));
55 uv_close((uv_handle_t*) q, NULL);
56 return;
57 }
58
59 uv_pipe_t *pipe = (uv_pipe_t*) q;
60 if (!uv_pipe_pending_count(pipe)) {
61 fprintf(stderr, "No pending count\n");
62 return;
63 }
64
65 uv_handle_type pending = uv_pipe_pending_type(pipe);
66 assert(pending == UV_TCP);
67
68 uv_tcp_t *client = (uv_tcp_t*) malloc(sizeof(uv_tcp_t));
69 uv_tcp_init(loop, client);
70 if (uv_accept(q, (uv_stream_t*) client) == 0) {
71 uv_os_fd_t fd;
72 uv_fileno((const uv_handle_t*) client, &fd);
73 fprintf(stderr, "Worker %d: Accepted fd %d\n", getpid(), fd);
74 uv_read_start((uv_stream_t*) client, alloc_buffer, echo_read);
75 }
76 else {
77 uv_close((uv_handle_t*) client, NULL);
78 }
79 }
80
main()81 int main() {
82 loop = uv_default_loop();
83
84 uv_pipe_init(loop, &queue, 1 /* ipc */);
85 uv_pipe_open(&queue, 0);
86 uv_read_start((uv_stream_t*)&queue, alloc_buffer, on_new_connection);
87 return uv_run(loop, UV_RUN_DEFAULT);
88 }
89