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 * using the multi interface to do a multipart formpost without blocking
24 * </DESC>
25 */
26
27 #include <stdio.h>
28 #include <string.h>
29 #include <sys/time.h>
30
31 #include <curl/curl.h>
32
main(void)33 int main(void)
34 {
35 CURL *curl;
36
37 CURLM *multi_handle;
38 int still_running = 0;
39
40 struct curl_httppost *formpost = NULL;
41 struct curl_httppost *lastptr = NULL;
42 struct curl_slist *headerlist = NULL;
43 static const char buf[] = "Expect:";
44
45 /* Fill in the file upload field. This makes libcurl load data from
46 the given file name when curl_easy_perform() is called. */
47 curl_formadd(&formpost,
48 &lastptr,
49 CURLFORM_COPYNAME, "sendfile",
50 CURLFORM_FILE, "postit2.c",
51 CURLFORM_END);
52
53 /* Fill in the filename field */
54 curl_formadd(&formpost,
55 &lastptr,
56 CURLFORM_COPYNAME, "filename",
57 CURLFORM_COPYCONTENTS, "postit2.c",
58 CURLFORM_END);
59
60 /* Fill in the submit field too, even if this is rarely needed */
61 curl_formadd(&formpost,
62 &lastptr,
63 CURLFORM_COPYNAME, "submit",
64 CURLFORM_COPYCONTENTS, "send",
65 CURLFORM_END);
66
67 curl = curl_easy_init();
68 multi_handle = curl_multi_init();
69
70 /* initialize custom header list (stating that Expect: 100-continue is not
71 wanted */
72 headerlist = curl_slist_append(headerlist, buf);
73 if(curl && multi_handle) {
74
75 /* what URL that receives this POST */
76 curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/upload.cgi");
77 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
78
79 curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
80 curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
81
82 curl_multi_add_handle(multi_handle, curl);
83
84 curl_multi_perform(multi_handle, &still_running);
85
86 while(still_running) {
87 struct timeval timeout;
88 int rc; /* select() return code */
89 CURLMcode mc; /* curl_multi_fdset() return code */
90
91 fd_set fdread;
92 fd_set fdwrite;
93 fd_set fdexcep;
94 int maxfd = -1;
95
96 long curl_timeo = -1;
97
98 FD_ZERO(&fdread);
99 FD_ZERO(&fdwrite);
100 FD_ZERO(&fdexcep);
101
102 /* set a suitable timeout to play around with */
103 timeout.tv_sec = 1;
104 timeout.tv_usec = 0;
105
106 curl_multi_timeout(multi_handle, &curl_timeo);
107 if(curl_timeo >= 0) {
108 timeout.tv_sec = curl_timeo / 1000;
109 if(timeout.tv_sec > 1)
110 timeout.tv_sec = 1;
111 else
112 timeout.tv_usec = (curl_timeo % 1000) * 1000;
113 }
114
115 /* get file descriptors from the transfers */
116 mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
117
118 if(mc != CURLM_OK) {
119 fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
120 break;
121 }
122
123 /* On success the value of maxfd is guaranteed to be >= -1. We call
124 select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
125 no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
126 to sleep 100ms, which is the minimum suggested value in the
127 curl_multi_fdset() doc. */
128
129 if(maxfd == -1) {
130 #ifdef _WIN32
131 Sleep(100);
132 rc = 0;
133 #else
134 /* Portable sleep for platforms other than Windows. */
135 struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
136 rc = select(0, NULL, NULL, NULL, &wait);
137 #endif
138 }
139 else {
140 /* Note that on some platforms 'timeout' may be modified by select().
141 If you need access to the original value save a copy beforehand. */
142 rc = select(maxfd + 1, &fdread, &fdwrite, &fdexcep, &timeout);
143 }
144
145 switch(rc) {
146 case -1:
147 /* select error */
148 break;
149 case 0:
150 default:
151 /* timeout or readable/writable sockets */
152 printf("perform!\n");
153 curl_multi_perform(multi_handle, &still_running);
154 printf("running: %d!\n", still_running);
155 break;
156 }
157 }
158
159 curl_multi_cleanup(multi_handle);
160
161 /* always cleanup */
162 curl_easy_cleanup(curl);
163
164 /* then cleanup the formpost chain */
165 curl_formfree(formpost);
166
167 /* free slist */
168 curl_slist_free_all(headerlist);
169 }
170 return 0;
171 }
172