curl / libcurl / API / Examples / multi-single.c

multi-single.c

/***************************************************************************
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 *
 * Copyright (C) 1998 - 2021, 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 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.
 *
 ***************************************************************************/
/* <DESC>
 * using the multi interface to do a single download
 * </DESC>
 */
 
#include <stdio.h>
#include <string.h>
 
/* somewhat unix-specific */
#include <sys/time.h>
#include <unistd.h>
 
/* curl stuff */
#include <curl/curl.h>
 
#ifdef _WIN32
#define WAITMS(x) Sleep(x)
#else
/* Portable sleep for platforms other than Windows. */
#define WAITMS(x)                               \ 
  struct timeval wait = { 0, (x) * 1000 };      \ 
  (void)select(0, NULL, NULL, NULL, &wait)
#endif
 
/*
 * Simply download a HTTP file.
 */
int main(void)
{
  CURL *http_handle;
  CURLM *multi_handle;
  int still_running = 1; /* keep number of running handles */
 
  curl_global_init(CURL_GLOBAL_DEFAULT);
 
  http_handle = curl_easy_init();
 
  /* set the options (I left out a few, you'll get the point anyway) */
  curl_easy_setopt(http_handle, CURLOPT_URL, "https://www.example.com/");
 
  /* init a multi stack */
  multi_handle = curl_multi_init();
 
  /* add the individual transfers */
  curl_multi_add_handle(multi_handle, http_handle);
 
  do {
    CURLMcode mc = curl_multi_perform(multi_handle, &still_running);
 
    if(!mc)
      /* wait for activity, timeout or "nothing" */
      mc = curl_multi_poll(multi_handle, NULL, 0, 1000, NULL);
 
    if(mc) {
      fprintf(stderr, "curl_multi_poll() failed, code %d.\n", (int)mc);
      break;
    }
 
  } while(still_running);
 
  curl_multi_remove_handle(multi_handle, http_handle);
 
  curl_easy_cleanup(http_handle);
 
  curl_multi_cleanup(multi_handle);
 
  curl_global_cleanup();
 
  return 0;
}