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comparison mupdf-source/thirdparty/curl/docs/examples/evhiperfifo.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 - 2019, 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 /* <DESC>
23 * multi socket interface together with libev
24 * </DESC>
25 */
26 /* Example application source code using the multi socket interface to
27 * download many files at once.
28 *
29 * This example features the same basic functionality as hiperfifo.c does,
30 * but this uses libev instead of libevent.
31 *
32 * Written by Jeff Pohlmeyer, converted to use libev by Markus Koetter
33
34 Requires libev and a (POSIX?) system that has mkfifo().
35
36 This is an adaptation of libcurl's "hipev.c" and libevent's "event-test.c"
37 sample programs.
38
39 When running, the program creates the named pipe "hiper.fifo"
40
41 Whenever there is input into the fifo, the program reads the input as a list
42 of URL's and creates some new easy handles to fetch each URL via the
43 curl_multi "hiper" API.
44
45
46 Thus, you can try a single URL:
47 % echo http://www.yahoo.com > hiper.fifo
48
49 Or a whole bunch of them:
50 % cat my-url-list > hiper.fifo
51
52 The fifo buffer is handled almost instantly, so you can even add more URL's
53 while the previous requests are still being downloaded.
54
55 Note:
56 For the sake of simplicity, URL length is limited to 1023 char's !
57
58 This is purely a demo app, all retrieved data is simply discarded by the write
59 callback.
60
61 */
62
63 #include <stdio.h>
64 #include <string.h>
65 #include <stdlib.h>
66 #include <sys/time.h>
67 #include <time.h>
68 #include <unistd.h>
69 #include <sys/poll.h>
70 #include <curl/curl.h>
71 #include <ev.h>
72 #include <fcntl.h>
73 #include <sys/stat.h>
74 #include <errno.h>
75
76 #define DPRINT(x...) printf(x)
77
78 #define MSG_OUT stdout /* Send info to stdout, change to stderr if you want */
79
80
81 /* Global information, common to all connections */
82 typedef struct _GlobalInfo
83 {
84 struct ev_loop *loop;
85 struct ev_io fifo_event;
86 struct ev_timer timer_event;
87 CURLM *multi;
88 int still_running;
89 FILE *input;
90 } GlobalInfo;
91
92
93 /* Information associated with a specific easy handle */
94 typedef struct _ConnInfo
95 {
96 CURL *easy;
97 char *url;
98 GlobalInfo *global;
99 char error[CURL_ERROR_SIZE];
100 } ConnInfo;
101
102
103 /* Information associated with a specific socket */
104 typedef struct _SockInfo
105 {
106 curl_socket_t sockfd;
107 CURL *easy;
108 int action;
109 long timeout;
110 struct ev_io ev;
111 int evset;
112 GlobalInfo *global;
113 } SockInfo;
114
115 static void timer_cb(EV_P_ struct ev_timer *w, int revents);
116
117 /* Update the event timer after curl_multi library calls */
118 static int multi_timer_cb(CURLM *multi, long timeout_ms, GlobalInfo *g)
119 {
120 DPRINT("%s %li\n", __PRETTY_FUNCTION__, timeout_ms);
121 ev_timer_stop(g->loop, &g->timer_event);
122 if(timeout_ms >= 0) {
123 /* -1 means delete, other values are timeout times in milliseconds */
124 double t = timeout_ms / 1000;
125 ev_timer_init(&g->timer_event, timer_cb, t, 0.);
126 ev_timer_start(g->loop, &g->timer_event);
127 }
128 return 0;
129 }
130
131 /* Die if we get a bad CURLMcode somewhere */
132 static void mcode_or_die(const char *where, CURLMcode code)
133 {
134 if(CURLM_OK != code) {
135 const char *s;
136 switch(code) {
137 case CURLM_BAD_HANDLE:
138 s = "CURLM_BAD_HANDLE";
139 break;
140 case CURLM_BAD_EASY_HANDLE:
141 s = "CURLM_BAD_EASY_HANDLE";
142 break;
143 case CURLM_OUT_OF_MEMORY:
144 s = "CURLM_OUT_OF_MEMORY";
145 break;
146 case CURLM_INTERNAL_ERROR:
147 s = "CURLM_INTERNAL_ERROR";
148 break;
149 case CURLM_UNKNOWN_OPTION:
150 s = "CURLM_UNKNOWN_OPTION";
151 break;
152 case CURLM_LAST:
153 s = "CURLM_LAST";
154 break;
155 default:
156 s = "CURLM_unknown";
157 break;
158 case CURLM_BAD_SOCKET:
159 s = "CURLM_BAD_SOCKET";
160 fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
161 /* ignore this error */
162 return;
163 }
164 fprintf(MSG_OUT, "ERROR: %s returns %s\n", where, s);
165 exit(code);
166 }
167 }
168
169
170
171 /* Check for completed transfers, and remove their easy handles */
172 static void check_multi_info(GlobalInfo *g)
173 {
174 char *eff_url;
175 CURLMsg *msg;
176 int msgs_left;
177 ConnInfo *conn;
178 CURL *easy;
179 CURLcode res;
180
181 fprintf(MSG_OUT, "REMAINING: %d\n", g->still_running);
182 while((msg = curl_multi_info_read(g->multi, &msgs_left))) {
183 if(msg->msg == CURLMSG_DONE) {
184 easy = msg->easy_handle;
185 res = msg->data.result;
186 curl_easy_getinfo(easy, CURLINFO_PRIVATE, &conn);
187 curl_easy_getinfo(easy, CURLINFO_EFFECTIVE_URL, &eff_url);
188 fprintf(MSG_OUT, "DONE: %s => (%d) %s\n", eff_url, res, conn->error);
189 curl_multi_remove_handle(g->multi, easy);
190 free(conn->url);
191 curl_easy_cleanup(easy);
192 free(conn);
193 }
194 }
195 }
196
197
198
199 /* Called by libevent when we get action on a multi socket */
200 static void event_cb(EV_P_ struct ev_io *w, int revents)
201 {
202 DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
203 GlobalInfo *g = (GlobalInfo*) w->data;
204 CURLMcode rc;
205
206 int action = ((revents & EV_READ) ? CURL_POLL_IN : 0) |
207 ((revents & EV_WRITE) ? CURL_POLL_OUT : 0);
208 rc = curl_multi_socket_action(g->multi, w->fd, action, &g->still_running);
209 mcode_or_die("event_cb: curl_multi_socket_action", rc);
210 check_multi_info(g);
211 if(g->still_running <= 0) {
212 fprintf(MSG_OUT, "last transfer done, kill timeout\n");
213 ev_timer_stop(g->loop, &g->timer_event);
214 }
215 }
216
217 /* Called by libevent when our timeout expires */
218 static void timer_cb(EV_P_ struct ev_timer *w, int revents)
219 {
220 DPRINT("%s w %p revents %i\n", __PRETTY_FUNCTION__, w, revents);
221
222 GlobalInfo *g = (GlobalInfo *)w->data;
223 CURLMcode rc;
224
225 rc = curl_multi_socket_action(g->multi, CURL_SOCKET_TIMEOUT, 0,
226 &g->still_running);
227 mcode_or_die("timer_cb: curl_multi_socket_action", rc);
228 check_multi_info(g);
229 }
230
231 /* Clean up the SockInfo structure */
232 static void remsock(SockInfo *f, GlobalInfo *g)
233 {
234 printf("%s \n", __PRETTY_FUNCTION__);
235 if(f) {
236 if(f->evset)
237 ev_io_stop(g->loop, &f->ev);
238 free(f);
239 }
240 }
241
242
243
244 /* Assign information to a SockInfo structure */
245 static void setsock(SockInfo *f, curl_socket_t s, CURL *e, int act,
246 GlobalInfo *g)
247 {
248 printf("%s \n", __PRETTY_FUNCTION__);
249
250 int kind = ((act & CURL_POLL_IN) ? EV_READ : 0) |
251 ((act & CURL_POLL_OUT) ? EV_WRITE : 0);
252
253 f->sockfd = s;
254 f->action = act;
255 f->easy = e;
256 if(f->evset)
257 ev_io_stop(g->loop, &f->ev);
258 ev_io_init(&f->ev, event_cb, f->sockfd, kind);
259 f->ev.data = g;
260 f->evset = 1;
261 ev_io_start(g->loop, &f->ev);
262 }
263
264
265
266 /* Initialize a new SockInfo structure */
267 static void addsock(curl_socket_t s, CURL *easy, int action, GlobalInfo *g)
268 {
269 SockInfo *fdp = calloc(sizeof(SockInfo), 1);
270
271 fdp->global = g;
272 setsock(fdp, s, easy, action, g);
273 curl_multi_assign(g->multi, s, fdp);
274 }
275
276 /* CURLMOPT_SOCKETFUNCTION */
277 static int sock_cb(CURL *e, curl_socket_t s, int what, void *cbp, void *sockp)
278 {
279 DPRINT("%s e %p s %i what %i cbp %p sockp %p\n",
280 __PRETTY_FUNCTION__, e, s, what, cbp, sockp);
281
282 GlobalInfo *g = (GlobalInfo*) cbp;
283 SockInfo *fdp = (SockInfo*) sockp;
284 const char *whatstr[]={ "none", "IN", "OUT", "INOUT", "REMOVE"};
285
286 fprintf(MSG_OUT,
287 "socket callback: s=%d e=%p what=%s ", s, e, whatstr[what]);
288 if(what == CURL_POLL_REMOVE) {
289 fprintf(MSG_OUT, "\n");
290 remsock(fdp, g);
291 }
292 else {
293 if(!fdp) {
294 fprintf(MSG_OUT, "Adding data: %s\n", whatstr[what]);
295 addsock(s, e, what, g);
296 }
297 else {
298 fprintf(MSG_OUT,
299 "Changing action from %s to %s\n",
300 whatstr[fdp->action], whatstr[what]);
301 setsock(fdp, s, e, what, g);
302 }
303 }
304 return 0;
305 }
306
307
308 /* CURLOPT_WRITEFUNCTION */
309 static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *data)
310 {
311 size_t realsize = size * nmemb;
312 ConnInfo *conn = (ConnInfo*) data;
313 (void)ptr;
314 (void)conn;
315 return realsize;
316 }
317
318
319 /* CURLOPT_PROGRESSFUNCTION */
320 static int prog_cb(void *p, double dltotal, double dlnow, double ult,
321 double uln)
322 {
323 ConnInfo *conn = (ConnInfo *)p;
324 (void)ult;
325 (void)uln;
326
327 fprintf(MSG_OUT, "Progress: %s (%g/%g)\n", conn->url, dlnow, dltotal);
328 return 0;
329 }
330
331
332 /* Create a new easy handle, and add it to the global curl_multi */
333 static void new_conn(char *url, GlobalInfo *g)
334 {
335 ConnInfo *conn;
336 CURLMcode rc;
337
338 conn = calloc(1, sizeof(ConnInfo));
339 conn->error[0]='\0';
340
341 conn->easy = curl_easy_init();
342 if(!conn->easy) {
343 fprintf(MSG_OUT, "curl_easy_init() failed, exiting!\n");
344 exit(2);
345 }
346 conn->global = g;
347 conn->url = strdup(url);
348 curl_easy_setopt(conn->easy, CURLOPT_URL, conn->url);
349 curl_easy_setopt(conn->easy, CURLOPT_WRITEFUNCTION, write_cb);
350 curl_easy_setopt(conn->easy, CURLOPT_WRITEDATA, conn);
351 curl_easy_setopt(conn->easy, CURLOPT_VERBOSE, 1L);
352 curl_easy_setopt(conn->easy, CURLOPT_ERRORBUFFER, conn->error);
353 curl_easy_setopt(conn->easy, CURLOPT_PRIVATE, conn);
354 curl_easy_setopt(conn->easy, CURLOPT_NOPROGRESS, 0L);
355 curl_easy_setopt(conn->easy, CURLOPT_PROGRESSFUNCTION, prog_cb);
356 curl_easy_setopt(conn->easy, CURLOPT_PROGRESSDATA, conn);
357 curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_TIME, 3L);
358 curl_easy_setopt(conn->easy, CURLOPT_LOW_SPEED_LIMIT, 10L);
359
360 fprintf(MSG_OUT,
361 "Adding easy %p to multi %p (%s)\n", conn->easy, g->multi, url);
362 rc = curl_multi_add_handle(g->multi, conn->easy);
363 mcode_or_die("new_conn: curl_multi_add_handle", rc);
364
365 /* note that the add_handle() will set a time-out to trigger very soon so
366 that the necessary socket_action() call will be called by this app */
367 }
368
369 /* This gets called whenever data is received from the fifo */
370 static void fifo_cb(EV_P_ struct ev_io *w, int revents)
371 {
372 char s[1024];
373 long int rv = 0;
374 int n = 0;
375 GlobalInfo *g = (GlobalInfo *)w->data;
376
377 do {
378 s[0]='\0';
379 rv = fscanf(g->input, "%1023s%n", s, &n);
380 s[n]='\0';
381 if(n && s[0]) {
382 new_conn(s, g); /* if we read a URL, go get it! */
383 }
384 else
385 break;
386 } while(rv != EOF);
387 }
388
389 /* Create a named pipe and tell libevent to monitor it */
390 static int init_fifo(GlobalInfo *g)
391 {
392 struct stat st;
393 static const char *fifo = "hiper.fifo";
394 curl_socket_t sockfd;
395
396 fprintf(MSG_OUT, "Creating named pipe \"%s\"\n", fifo);
397 if(lstat (fifo, &st) == 0) {
398 if((st.st_mode & S_IFMT) == S_IFREG) {
399 errno = EEXIST;
400 perror("lstat");
401 exit(1);
402 }
403 }
404 unlink(fifo);
405 if(mkfifo (fifo, 0600) == -1) {
406 perror("mkfifo");
407 exit(1);
408 }
409 sockfd = open(fifo, O_RDWR | O_NONBLOCK, 0);
410 if(sockfd == -1) {
411 perror("open");
412 exit(1);
413 }
414 g->input = fdopen(sockfd, "r");
415
416 fprintf(MSG_OUT, "Now, pipe some URL's into > %s\n", fifo);
417 ev_io_init(&g->fifo_event, fifo_cb, sockfd, EV_READ);
418 ev_io_start(g->loop, &g->fifo_event);
419 return (0);
420 }
421
422 int main(int argc, char **argv)
423 {
424 GlobalInfo g;
425 (void)argc;
426 (void)argv;
427
428 memset(&g, 0, sizeof(GlobalInfo));
429 g.loop = ev_default_loop(0);
430
431 init_fifo(&g);
432 g.multi = curl_multi_init();
433
434 ev_timer_init(&g.timer_event, timer_cb, 0., 0.);
435 g.timer_event.data = &g;
436 g.fifo_event.data = &g;
437 curl_multi_setopt(g.multi, CURLMOPT_SOCKETFUNCTION, sock_cb);
438 curl_multi_setopt(g.multi, CURLMOPT_SOCKETDATA, &g);
439 curl_multi_setopt(g.multi, CURLMOPT_TIMERFUNCTION, multi_timer_cb);
440 curl_multi_setopt(g.multi, CURLMOPT_TIMERDATA, &g);
441
442 /* we don't call any curl_multi_socket*() function yet as we have no handles
443 added! */
444
445 ev_loop(g.loop, 0);
446 curl_multi_cleanup(g.multi);
447 return 0;
448 }