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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. */
+
+#include <stdio.h>
+#include <string.h>
+
+/* somewhat unix-specific */
+#include <sys/time.h>
+#include <unistd.h>
+
+/* curl stuff */
+#include <curl/curl.h>
+
+/*
+ * Download a HTTP file and upload an FTP file simultaneously.
+ */
+
+#define HANDLECOUNT 2 /* Number of simultaneous transfers */
+#define HTTP_HANDLE 0 /* Index for the HTTP transfer */
+#define FTP_HANDLE 1 /* Index for the FTP transfer */
+
+int main(void)
+{
+ CURL *handles[HANDLECOUNT];
+ CURLM *multi_handle;
+
+ int still_running; /* keep number of running handles */
+ int i;
+
+ CURLMsg *msg; /* for picking up messages with the transfer status */
+ int msgs_left; /* how many messages are left */
+
+ /* Allocate one CURL handle per transfer */
+ for (i=0; i<HANDLECOUNT; i++)
+ handles[i] = curl_easy_init();
+
+ /* set the options (I left out a few, you'll get the point anyway) */
+ curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "http://example.com");
+
+ curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://example.com");
+ curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L);
+
+ /* init a multi stack */
+ multi_handle = curl_multi_init();
+
+ /* add the individual transfers */
+ for (i=0; i<HANDLECOUNT; i++)
+ curl_multi_add_handle(multi_handle, handles[i]);
+
+ /* we start some action by calling perform right away */
+ 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: /* timeout */
+ default: /* action */
+ curl_multi_perform(multi_handle, &still_running);
+ break;
+ }
+ } while(still_running);
+
+ /* See how the transfers went */
+ while ((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
+ if (msg->msg == CURLMSG_DONE) {
+ int idx, found = 0;
+
+ /* Find out which handle this message is about */
+ for (idx=0; idx<HANDLECOUNT; idx++) {
+ found = (msg->easy_handle == handles[idx]);
+ if(found)
+ break;
+ }
+
+ switch (idx) {
+ case HTTP_HANDLE:
+ printf("HTTP transfer completed with status %d\n", msg->data.result);
+ break;
+ case FTP_HANDLE:
+ printf("FTP transfer completed with status %d\n", msg->data.result);
+ break;
+ }
+ }
+ }
+
+ curl_multi_cleanup(multi_handle);
+
+ /* Free the CURL handles */
+ for (i=0; i<HANDLECOUNT; i++)
+ curl_easy_cleanup(handles[i]);
+
+ return 0;
+}