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+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+/* This is an example application source code using the multi interface
+ * to do a multipart formpost without "blocking". */
+#include <stdio.h>
+#include <string.h>
+#include <sys/time.h>
+
+#include <curl/curl.h>
+
+int main(void)
+{
+ CURL *curl;
+
+ CURLM *multi_handle;
+ int still_running;
+
+ struct curl_httppost *formpost=NULL;
+ struct curl_httppost *lastptr=NULL;
+ struct curl_slist *headerlist=NULL;
+ static const char buf[] = "Expect:";
+
+ /* Fill in the file upload field. This makes libcurl load data from
+ the given file name when curl_easy_perform() is called. */
+ curl_formadd(&formpost,
+ &lastptr,
+ CURLFORM_COPYNAME, "sendfile",
+ CURLFORM_FILE, "postit2.c",
+ CURLFORM_END);
+
+ /* Fill in the filename field */
+ curl_formadd(&formpost,
+ &lastptr,
+ CURLFORM_COPYNAME, "filename",
+ CURLFORM_COPYCONTENTS, "postit2.c",
+ CURLFORM_END);
+
+ /* Fill in the submit field too, even if this is rarely needed */
+ curl_formadd(&formpost,
+ &lastptr,
+ CURLFORM_COPYNAME, "submit",
+ CURLFORM_COPYCONTENTS, "send",
+ CURLFORM_END);
+
+ curl = curl_easy_init();
+ multi_handle = curl_multi_init();
+
+ /* initalize custom header list (stating that Expect: 100-continue is not
+ wanted */
+ headerlist = curl_slist_append(headerlist, buf);
+ if(curl && multi_handle) {
+
+ /* what URL that receives this POST */
+ curl_easy_setopt(curl, CURLOPT_URL, "http://www.example.com/upload.cgi");
+ curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+
+ curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headerlist);
+ curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);
+
+ curl_multi_add_handle(multi_handle, curl);
+
+ curl_multi_perform(multi_handle, &still_running);
+
+ do {
+ struct timeval timeout;
+ int rc; /* select() return code */
+
+ fd_set fdread;
+ fd_set fdwrite;
+ fd_set fdexcep;
+ int maxfd = -1;
+
+ long curl_timeo = -1;
+
+ FD_ZERO(&fdread);
+ FD_ZERO(&fdwrite);
+ FD_ZERO(&fdexcep);
+
+ /* set a suitable timeout to play around with */
+ timeout.tv_sec = 1;
+ timeout.tv_usec = 0;
+
+ curl_multi_timeout(multi_handle, &curl_timeo);
+ if(curl_timeo >= 0) {
+ timeout.tv_sec = curl_timeo / 1000;
+ if(timeout.tv_sec > 1)
+ timeout.tv_sec = 1;
+ else
+ timeout.tv_usec = (curl_timeo % 1000) * 1000;
+ }
+
+ /* get file descriptors from the transfers */
+ curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
+
+ /* In a real-world program you OF COURSE check the return code of the
+ function calls. On success, the value of maxfd is guaranteed to be
+ greater or equal than -1. We call select(maxfd + 1, ...), specially in
+ case of (maxfd == -1), we call select(0, ...), which is basically equal
+ to sleep. */
+
+ rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+
+ switch(rc) {
+ case -1:
+ /* select error */
+ break;
+ case 0:
+ default:
+ /* timeout or readable/writable sockets */
+ printf("perform!\n");
+ curl_multi_perform(multi_handle, &still_running);
+ printf("running: %d!\n", still_running);
+ break;
+ }
+ } while(still_running);
+
+ curl_multi_cleanup(multi_handle);
+
+ /* always cleanup */
+ curl_easy_cleanup(curl);
+
+ /* then cleanup the formpost chain */
+ curl_formfree(formpost);
+
+ /* free slist */
+ curl_slist_free_all (headerlist);
+ }
+ return 0;
+}