1/***************************************************************************
2 *                                  _   _ ____  _
3 *  Project                     ___| | | |  _ \| |
4 *                             / __| | | | |_) | |
5 *                            | (__| |_| |  _ <| |___
6 *                             \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2011, 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 http://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/* This is an example application source code using the multi interface
23 * to do a multipart formpost without "blocking". */
24#include <stdio.h>
25#include <string.h>
26#include <sys/time.h>
27
28#include <curl/curl.h>
29
30int main(void)
31{
32  CURL *curl;
33
34  CURLM *multi_handle;
35  int still_running;
36
37  struct curl_httppost *formpost=NULL;
38  struct curl_httppost *lastptr=NULL;
39  struct curl_slist *headerlist=NULL;
40  static const char buf[] = "Expect:";
41
42  /* Fill in the file upload field. This makes libcurl load data from
43     the given file name when curl_easy_perform() is called. */
44  curl_formadd(&formpost,
45               &lastptr,
46               CURLFORM_COPYNAME, "sendfile",
47               CURLFORM_FILE, "postit2.c",
48               CURLFORM_END);
49
50  /* Fill in the filename field */
51  curl_formadd(&formpost,
52               &lastptr,
53               CURLFORM_COPYNAME, "filename",
54               CURLFORM_COPYCONTENTS, "postit2.c",
55               CURLFORM_END);
56
57  /* Fill in the submit field too, even if this is rarely needed */
58  curl_formadd(&formpost,
59               &lastptr,
60               CURLFORM_COPYNAME, "submit",
61               CURLFORM_COPYCONTENTS, "send",
62               CURLFORM_END);
63
64  curl = curl_easy_init();
65  multi_handle = curl_multi_init();
66
67  /* initalize custom header list (stating that Expect: 100-continue is not
68     wanted */
69  headerlist = curl_slist_append(headerlist, buf);
70  if(curl && multi_handle) {
71
72    /* what URL that receives this POST */
73    curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com/upload.cgi");
74    curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
75
76    curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
77    curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
78
79    curl_multi_add_handle(multi_handle, curl);
80
81    curl_multi_perform(multi_handle, &still_running);
82
83    while(still_running) {
84      struct timeval timeout;
85      int rc; /* select() return code */
86
87      fd_set fdread;
88      fd_set fdwrite;
89      fd_set fdexcep;
90      int maxfd = -1;
91
92      long curl_timeo = -1;
93
94      FD_ZERO(&fdread);
95      FD_ZERO(&fdwrite);
96      FD_ZERO(&fdexcep);
97
98      /* set a suitable timeout to play around with */
99      timeout.tv_sec = 1;
100      timeout.tv_usec = 0;
101
102      curl_multi_timeout(multi_handle, &curl_timeo);
103      if(curl_timeo >= 0) {
104        timeout.tv_sec = curl_timeo / 1000;
105        if(timeout.tv_sec > 1)
106          timeout.tv_sec = 1;
107        else
108          timeout.tv_usec = (curl_timeo % 1000) * 1000;
109      }
110
111      /* get file descriptors from the transfers */
112      curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
113
114      /* In a real-world program you OF COURSE check the return code of the
115         function calls.  On success, the value of maxfd is guaranteed to be
116         greater or equal than -1.  We call select(maxfd + 1, ...), specially in
117         case of (maxfd == -1), we call select(0, ...), which is basically equal
118         to sleep. */
119
120      rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
121
122      switch(rc) {
123      case -1:
124        /* select error */
125        break;
126      case 0:
127      default:
128        /* timeout or readable/writable sockets */
129        printf("perform!\n");
130        curl_multi_perform(multi_handle, &still_running);
131        printf("running: %d!\n", still_running);
132        break;
133      }
134    }
135
136    curl_multi_cleanup(multi_handle);
137
138    /* always cleanup */
139    curl_easy_cleanup(curl);
140
141    /* then cleanup the formpost chain */
142    curl_formfree(formpost);
143
144    /* free slist */
145    curl_slist_free_all (headerlist);
146  }
147  return 0;
148}
149