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comparison mupdf-source/thirdparty/curl/docs/examples/multi-app.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 /* <DESC>
23 * A basic application source code using the multi interface doing two
24 * transfers in parallel.
25 * </DESC>
26 */
27
28 #include <stdio.h>
29 #include <string.h>
30
31 /* somewhat unix-specific */
32 #include <sys/time.h>
33 #include <unistd.h>
34
35 /* curl stuff */
36 #include <curl/curl.h>
37
38 /*
39 * Download a HTTP file and upload an FTP file simultaneously.
40 */
41
42 #define HANDLECOUNT 2 /* Number of simultaneous transfers */
43 #define HTTP_HANDLE 0 /* Index for the HTTP transfer */
44 #define FTP_HANDLE 1 /* Index for the FTP transfer */
45
46 int main(void)
47 {
48 CURL *handles[HANDLECOUNT];
49 CURLM *multi_handle;
50
51 int still_running = 0; /* keep number of running handles */
52 int i;
53
54 CURLMsg *msg; /* for picking up messages with the transfer status */
55 int msgs_left; /* how many messages are left */
56
57 /* Allocate one CURL handle per transfer */
58 for(i = 0; i<HANDLECOUNT; i++)
59 handles[i] = curl_easy_init();
60
61 /* set the options (I left out a few, you'll get the point anyway) */
62 curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "https://example.com");
63
64 curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://example.com");
65 curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L);
66
67 /* init a multi stack */
68 multi_handle = curl_multi_init();
69
70 /* add the individual transfers */
71 for(i = 0; i<HANDLECOUNT; i++)
72 curl_multi_add_handle(multi_handle, handles[i]);
73
74 /* we start some action by calling perform right away */
75 curl_multi_perform(multi_handle, &still_running);
76
77 while(still_running) {
78 struct timeval timeout;
79 int rc; /* select() return code */
80 CURLMcode mc; /* curl_multi_fdset() return code */
81
82 fd_set fdread;
83 fd_set fdwrite;
84 fd_set fdexcep;
85 int maxfd = -1;
86
87 long curl_timeo = -1;
88
89 FD_ZERO(&fdread);
90 FD_ZERO(&fdwrite);
91 FD_ZERO(&fdexcep);
92
93 /* set a suitable timeout to play around with */
94 timeout.tv_sec = 1;
95 timeout.tv_usec = 0;
96
97 curl_multi_timeout(multi_handle, &curl_timeo);
98 if(curl_timeo >= 0) {
99 timeout.tv_sec = curl_timeo / 1000;
100 if(timeout.tv_sec > 1)
101 timeout.tv_sec = 1;
102 else
103 timeout.tv_usec = (curl_timeo % 1000) * 1000;
104 }
105
106 /* get file descriptors from the transfers */
107 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
108
109 if(mc != CURLM_OK) {
110 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
111 break;
112 }
113
114 /* On success the value of maxfd is guaranteed to be >= -1. We call
115 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
116 no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
117 to sleep 100ms, which is the minimum suggested value in the
118 curl_multi_fdset() doc. */
119
120 if(maxfd == -1) {
121 #ifdef _WIN32
122 Sleep(100);
123 rc = 0;
124 #else
125 /* Portable sleep for platforms other than Windows. */
126 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
127 rc = select(0, NULL, NULL, NULL, &wait);
128 #endif
129 }
130 else {
131 /* Note that on some platforms 'timeout' may be modified by select().
132 If you need access to the original value save a copy beforehand. */
133 rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
134 }
135
136 switch(rc) {
137 case -1:
138 /* select error */
139 break;
140 case 0: /* timeout */
141 default: /* action */
142 curl_multi_perform(multi_handle, &still_running);
143 break;
144 }
145 }
146
147 /* See how the transfers went */
148 while((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
149 if(msg->msg == CURLMSG_DONE) {
150 int idx;
151
152 /* Find out which handle this message is about */
153 for(idx = 0; idx<HANDLECOUNT; idx++) {
154 int found = (msg->easy_handle == handles[idx]);
155 if(found)
156 break;
157 }
158
159 switch(idx) {
160 case HTTP_HANDLE:
161 printf("HTTP transfer completed with status %d\n", msg->data.result);
162 break;
163 case FTP_HANDLE:
164 printf("FTP transfer completed with status %d\n", msg->data.result);
165 break;
166 }
167 }
168 }
169
170 curl_multi_cleanup(multi_handle);
171
172 /* Free the CURL handles */
173 for(i = 0; i<HANDLECOUNT; i++)
174 curl_easy_cleanup(handles[i]);
175
176 return 0;
177 }