1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 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.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 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 /* <DESC>
25 * A basic application source code using the multi interface doing two
26 * transfers in parallel.
27 * </DESC>
28 */
29
30 #include <stdio.h>
31 #include <string.h>
32
33 /* somewhat unix-specific */
34 #include <sys/time.h>
35 #include <unistd.h>
36
37 /* curl stuff */
38 #include <curl/curl.h>
39
40 /*
41 * Download an HTTP file and upload an FTP file simultaneously.
42 */
43
44 #define HANDLECOUNT 2 /* Number of simultaneous transfers */
45 #define HTTP_HANDLE 0 /* Index for the HTTP transfer */
46 #define FTP_HANDLE 1 /* Index for the FTP transfer */
47
main(void)48 int main(void)
49 {
50 CURL *handles[HANDLECOUNT];
51 CURLM *multi_handle;
52
53 int still_running = 1; /* keep number of running handles */
54 int i;
55
56 CURLMsg *msg; /* for picking up messages with the transfer status */
57 int msgs_left; /* how many messages are left */
58
59 /* Allocate one CURL handle per transfer */
60 for(i = 0; i<HANDLECOUNT; i++)
61 handles[i] = curl_easy_init();
62
63 /* set the options (I left out a few, you will get the point anyway) */
64 curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "https://example.com");
65
66 curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://example.com");
67 curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L);
68
69 /* init a multi stack */
70 multi_handle = curl_multi_init();
71
72 /* add the individual transfers */
73 for(i = 0; i<HANDLECOUNT; i++)
74 curl_multi_add_handle(multi_handle, handles[i]);
75
76 while(still_running) {
77 CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
78
79 if(still_running)
80 /* wait for activity, timeout or "nothing" */
81 mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
82
83 if(mc)
84 break;
85 }
86 /* See how the transfers went */
87 while((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
88 if(msg->msg == CURLMSG_DONE) {
89 int idx;
90
91 /* Find out which handle this message is about */
92 for(idx = 0; idx<HANDLECOUNT; idx++) {
93 int found = (msg->easy_handle == handles[idx]);
94 if(found)
95 break;
96 }
97
98 switch(idx) {
99 case HTTP_HANDLE:
100 printf("HTTP transfer completed with status %d\n", msg->data.result);
101 break;
102 case FTP_HANDLE:
103 printf("FTP transfer completed with status %d\n", msg->data.result);
104 break;
105 }
106 }
107 }
108
109 /* remove the transfers and cleanup the handles */
110 for(i = 0; i<HANDLECOUNT; i++) {
111 curl_multi_remove_handle(multi_handle, handles[i]);
112 curl_easy_cleanup(handles[i]);
113 }
114
115 curl_multi_cleanup(multi_handle);
116
117 return 0;
118 }
119