curl/docs/examples/multi-app.c

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
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* are also available at https://curl.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.
*
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* SPDX-License-Identifier: curl
*
***************************************************************************/
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/* <DESC>
* A basic application source code using the multi interface doing two
* transfers in parallel.
* </DESC>
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*/
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#include <stdio.h>
#include <string.h>
/* somewhat unix-specific */
#include <sys/time.h>
#include <unistd.h>
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/* curl stuff */
#include <curl/curl.h>
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/*
* Download an HTTP file and upload an FTP file simultaneously.
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*/
#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 */
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int main(void)
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{
CURL *handles[HANDLECOUNT];
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CURLM *multi_handle;
int still_running = 1; /* keep number of running handles */
int i;
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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();
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/* set the options (I left out a few, you will get the point anyway) */
curl_easy_setopt(handles[HTTP_HANDLE], CURLOPT_URL, "https://example.com");
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curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_URL, "ftp://example.com");
curl_easy_setopt(handles[FTP_HANDLE], CURLOPT_UPLOAD, 1L);
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/* 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]);
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while(still_running) {
CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
if(still_running)
/* wait for activity, timeout or "nothing" */
mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
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if(mc)
break;
}
/* See how the transfers went */
while((msg = curl_multi_info_read(multi_handle, &msgs_left))) {
if(msg->msg == CURLMSG_DONE) {
int idx;
/* Find out which handle this message is about */
for(idx = 0; idx<HANDLECOUNT; idx++) {
int 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;
}
}
}
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/* remove the transfers and cleanup the handles */
for(i = 0; i<HANDLECOUNT; i++) {
curl_multi_remove_handle(multi_handle, handles[i]);
curl_easy_cleanup(handles[i]);
}
curl_multi_cleanup(multi_handle);
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return 0;
}