1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <uv.h>
5 
6 #ifdef _WIN32
7 #define PIPENAME "\\\\?\\pipe\\echo.sock"
8 #else
9 #define PIPENAME "/tmp/echo.sock"
10 #endif
11 
12 uv_loop_t *loop;
13 
14 typedef struct {
15     uv_write_t req;
16     uv_buf_t buf;
17 } write_req_t;
18 
free_write_req(uv_write_t * req)19 void free_write_req(uv_write_t *req) {
20     write_req_t *wr = (write_req_t*) req;
21     free(wr->buf.base);
22     free(wr);
23 }
24 
alloc_buffer(uv_handle_t * handle,size_t suggested_size,uv_buf_t * buf)25 void alloc_buffer(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf) {
26   buf->base = malloc(suggested_size);
27   buf->len = suggested_size;
28 }
29 
echo_write(uv_write_t * req,int status)30 void echo_write(uv_write_t *req, int status) {
31     if (status < 0) {
32         fprintf(stderr, "Write error %s\n", uv_err_name(status));
33     }
34     free_write_req(req);
35 }
36 
echo_read(uv_stream_t * client,ssize_t nread,const uv_buf_t * buf)37 void echo_read(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf) {
38     if (nread > 0) {
39         write_req_t *req = (write_req_t*) malloc(sizeof(write_req_t));
40         req->buf = uv_buf_init(buf->base, nread);
41         uv_write((uv_write_t*) req, client, &req->buf, 1, echo_write);
42         return;
43     }
44 
45     if (nread < 0) {
46         if (nread != UV_EOF)
47             fprintf(stderr, "Read error %s\n", uv_err_name(nread));
48         uv_close((uv_handle_t*) client, NULL);
49     }
50 
51     free(buf->base);
52 }
53 
on_new_connection(uv_stream_t * server,int status)54 void on_new_connection(uv_stream_t *server, int status) {
55     if (status == -1) {
56         // error!
57         return;
58     }
59 
60     uv_pipe_t *client = (uv_pipe_t*) malloc(sizeof(uv_pipe_t));
61     uv_pipe_init(loop, client, 0);
62     if (uv_accept(server, (uv_stream_t*) client) == 0) {
63         uv_read_start((uv_stream_t*) client, alloc_buffer, echo_read);
64     }
65     else {
66         uv_close((uv_handle_t*) client, NULL);
67     }
68 }
69 
remove_sock(int sig)70 void remove_sock(int sig) {
71     uv_fs_t req;
72     uv_fs_unlink(loop, &req, PIPENAME, NULL);
73     exit(0);
74 }
75 
main()76 int main() {
77     loop = uv_default_loop();
78 
79     uv_pipe_t server;
80     uv_pipe_init(loop, &server, 0);
81 
82     signal(SIGINT, remove_sock);
83 
84     int r;
85     if ((r = uv_pipe_bind(&server, PIPENAME))) {
86         fprintf(stderr, "Bind error %s\n", uv_err_name(r));
87         return 1;
88     }
89     if ((r = uv_listen((uv_stream_t*) &server, 128, on_new_connection))) {
90         fprintf(stderr, "Listen error %s\n", uv_err_name(r));
91         return 2;
92     }
93     return uv_run(loop, UV_RUN_DEFAULT);
94 }
95