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comparison mupdf-source/thirdparty/curl/docs/examples/multi-uv.c @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.haxx.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 ***************************************************************************/
22
23 /* <DESC>
24 * multi_socket API using libuv
25 * </DESC>
26 */
27 /* Example application using the multi socket interface to download multiple
28 files in parallel, powered by libuv.
29
30 Requires libuv and (of course) libcurl.
31
32 See https://nikhilm.github.io/uvbook/ for more information on libuv.
33 */
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <uv.h>
38 #include <curl/curl.h>
39
40 uv_loop_t *loop;
41 CURLM *curl_handle;
42 uv_timer_t timeout;
43
44 typedef struct curl_context_s {
45 uv_poll_t poll_handle;
46 curl_socket_t sockfd;
47 } curl_context_t;
48
49 static curl_context_t* create_curl_context(curl_socket_t sockfd)
50 {
51 curl_context_t *context;
52
53 context = (curl_context_t *) malloc(sizeof(*context));
54
55 context->sockfd = sockfd;
56
57 uv_poll_init_socket(loop, &context->poll_handle, sockfd);
58 context->poll_handle.data = context;
59
60 return context;
61 }
62
63 static void curl_close_cb(uv_handle_t *handle)
64 {
65 curl_context_t *context = (curl_context_t *) handle->data;
66 free(context);
67 }
68
69 static void destroy_curl_context(curl_context_t *context)
70 {
71 uv_close((uv_handle_t *) &context->poll_handle, curl_close_cb);
72 }
73
74 static void add_download(const char *url, int num)
75 {
76 char filename[50];
77 FILE *file;
78 CURL *handle;
79
80 snprintf(filename, 50, "%d.download", num);
81
82 file = fopen(filename, "wb");
83 if(!file) {
84 fprintf(stderr, "Error opening %s\n", filename);
85 return;
86 }
87
88 handle = curl_easy_init();
89 curl_easy_setopt(handle, CURLOPT_WRITEDATA, file);
90 curl_easy_setopt(handle, CURLOPT_PRIVATE, file);
91 curl_easy_setopt(handle, CURLOPT_URL, url);
92 curl_multi_add_handle(curl_handle, handle);
93 fprintf(stderr, "Added download %s -> %s\n", url, filename);
94 }
95
96 static void check_multi_info(void)
97 {
98 char *done_url;
99 CURLMsg *message;
100 int pending;
101 CURL *easy_handle;
102 FILE *file;
103
104 while((message = curl_multi_info_read(curl_handle, &pending))) {
105 switch(message->msg) {
106 case CURLMSG_DONE:
107 /* Do not use message data after calling curl_multi_remove_handle() and
108 curl_easy_cleanup(). As per curl_multi_info_read() docs:
109 "WARNING: The data the returned pointer points to will not survive
110 calling curl_multi_cleanup, curl_multi_remove_handle or
111 curl_easy_cleanup." */
112 easy_handle = message->easy_handle;
113
114 curl_easy_getinfo(easy_handle, CURLINFO_EFFECTIVE_URL, &done_url);
115 curl_easy_getinfo(easy_handle, CURLINFO_PRIVATE, &file);
116 printf("%s DONE\n", done_url);
117
118 curl_multi_remove_handle(curl_handle, easy_handle);
119 curl_easy_cleanup(easy_handle);
120 if(file) {
121 fclose(file);
122 }
123 break;
124
125 default:
126 fprintf(stderr, "CURLMSG default\n");
127 break;
128 }
129 }
130 }
131
132 static void curl_perform(uv_poll_t *req, int status, int events)
133 {
134 int running_handles;
135 int flags = 0;
136 curl_context_t *context;
137
138 if(events & UV_READABLE)
139 flags |= CURL_CSELECT_IN;
140 if(events & UV_WRITABLE)
141 flags |= CURL_CSELECT_OUT;
142
143 context = (curl_context_t *) req->data;
144
145 curl_multi_socket_action(curl_handle, context->sockfd, flags,
146 &running_handles);
147
148 check_multi_info();
149 }
150
151 static void on_timeout(uv_timer_t *req)
152 {
153 int running_handles;
154 curl_multi_socket_action(curl_handle, CURL_SOCKET_TIMEOUT, 0,
155 &running_handles);
156 check_multi_info();
157 }
158
159 static int start_timeout(CURLM *multi, long timeout_ms, void *userp)
160 {
161 if(timeout_ms < 0) {
162 uv_timer_stop(&timeout);
163 }
164 else {
165 if(timeout_ms == 0)
166 timeout_ms = 1; /* 0 means directly call socket_action, but we'll do it
167 in a bit */
168 uv_timer_start(&timeout, on_timeout, timeout_ms, 0);
169 }
170 return 0;
171 }
172
173 static int handle_socket(CURL *easy, curl_socket_t s, int action, void *userp,
174 void *socketp)
175 {
176 curl_context_t *curl_context;
177 int events = 0;
178
179 switch(action) {
180 case CURL_POLL_IN:
181 case CURL_POLL_OUT:
182 case CURL_POLL_INOUT:
183 curl_context = socketp ?
184 (curl_context_t *) socketp : create_curl_context(s);
185
186 curl_multi_assign(curl_handle, s, (void *) curl_context);
187
188 if(action != CURL_POLL_IN)
189 events |= UV_WRITABLE;
190 if(action != CURL_POLL_OUT)
191 events |= UV_READABLE;
192
193 uv_poll_start(&curl_context->poll_handle, events, curl_perform);
194 break;
195 case CURL_POLL_REMOVE:
196 if(socketp) {
197 uv_poll_stop(&((curl_context_t*)socketp)->poll_handle);
198 destroy_curl_context((curl_context_t*) socketp);
199 curl_multi_assign(curl_handle, s, NULL);
200 }
201 break;
202 default:
203 abort();
204 }
205
206 return 0;
207 }
208
209 int main(int argc, char **argv)
210 {
211 loop = uv_default_loop();
212
213 if(argc <= 1)
214 return 0;
215
216 if(curl_global_init(CURL_GLOBAL_ALL)) {
217 fprintf(stderr, "Could not init curl\n");
218 return 1;
219 }
220
221 uv_timer_init(loop, &timeout);
222
223 curl_handle = curl_multi_init();
224 curl_multi_setopt(curl_handle, CURLMOPT_SOCKETFUNCTION, handle_socket);
225 curl_multi_setopt(curl_handle, CURLMOPT_TIMERFUNCTION, start_timeout);
226
227 while(argc-- > 1) {
228 add_download(argv[argc], argc);
229 }
230
231 uv_run(loop, UV_RUN_DEFAULT);
232 curl_multi_cleanup(curl_handle);
233
234 return 0;
235 }