-/*****************************************************************************
+/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
- * $Id$
+ * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al.
*
- * This is an example application source code using the multi interface
- * to do a multipart formpost without "blocking".
- */
+ * 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(int argc, char *argv[])
+int main(void)
{
CURL *curl;
struct curl_slist *headerlist=NULL;
static const char buf[] = "Expect:";
- /* Fill in the file upload field. This makes libcurl load data from
+ /* 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,
if(curl && multi_handle) {
/* what URL that receives this POST */
- curl_easy_setopt(curl, CURLOPT_URL,
- "http://www.fillinyoururl.com/upload.cgi");
- curl_easy_setopt(curl, CURLOPT_VERBOSE, 1);
+ 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);
- while(CURLM_CALL_MULTI_PERFORM ==
- curl_multi_perform(multi_handle, &still_running));
+ curl_multi_perform(multi_handle, &still_running);
- while(still_running) {
+ do {
struct timeval timeout;
int rc; /* select() return code */
+ CURLMcode mc; /* curl_multi_fdset() return code */
fd_set fdread;
fd_set fdwrite;
fd_set fdexcep;
- int maxfd;
+ int maxfd = -1;
+
+ long curl_timeo = -1;
FD_ZERO(&fdread);
FD_ZERO(&fdwrite);
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);
+ mc = 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, *and* you make sure that maxfd is bigger than -1
- so that the call to select() below makes sense! */
+ if(mc != CURLM_OK)
+ {
+ fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
+ break;
+ }
- rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+ /* On success the value of maxfd is guaranteed to be >= -1. We call
+ select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
+ no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
+ to sleep 100ms, which is the minimum suggested value in the
+ curl_multi_fdset() doc. */
+
+ if(maxfd == -1) {
+#ifdef _WIN32
+ Sleep(100);
+ rc = 0;
+#else
+ /* Portable sleep for platforms other than Windows. */
+ struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
+ rc = select(0, NULL, NULL, NULL, &wait);
+#endif
+ }
+ else {
+ /* Note that on some platforms 'timeout' may be modified by select().
+ If you need access to the original value save a copy beforehand. */
+ rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+ }
switch(rc) {
case -1:
/* select error */
break;
case 0:
- printf("timeout!\n");
default:
/* timeout or readable/writable sockets */
printf("perform!\n");
- while(CURLM_CALL_MULTI_PERFORM ==
- curl_multi_perform(multi_handle, &still_running));
+ curl_multi_perform(multi_handle, &still_running);
printf("running: %d!\n", still_running);
break;
}
- }
+ } while(still_running);
curl_multi_cleanup(multi_handle);