source example trying to reproduce curl issue #3629

issue-3629.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2019, 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.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.
 *
 ***************************************************************************/
#include <stdio.h>
#include <string.h>

/* somewhat unix-specific */
#include <sys/time.h>
#include <unistd.h>

/* curl stuff */
#include <curl/curl.h>

/*
 * Simply download three HTTP files!
 */
int main(void)
{
  CURL *http_handle1;
  CURL *http_handle2;
  CURL *http_handle3;
  CURLM *multi_handle;
  char error1[CURL_ERROR_SIZE];
  char error2[CURL_ERROR_SIZE];
  char error3[CURL_ERROR_SIZE];

  int still_running = 3; /* keep number of running handles */

  http_handle1 = curl_easy_init();
  http_handle2 = curl_easy_init();
  http_handle3 = curl_easy_init();

  /* set options */
  curl_easy_setopt(http_handle1, CURLOPT_URL, "https://www.example.com/");
  curl_easy_setopt(http_handle2, CURLOPT_URL, "https://www.example.com/");
  curl_easy_setopt(http_handle3, CURLOPT_URL, "https://www.example.com/");

  curl_easy_setopt(http_handle1, CURLOPT_ERRORBUFFER, error1);
  curl_easy_setopt(http_handle2, CURLOPT_ERRORBUFFER, error2);
  curl_easy_setopt(http_handle3, CURLOPT_ERRORBUFFER, error3);

  /* init a multi stack */
  multi_handle = curl_multi_init();

  /* add the individual transfers */
  curl_multi_add_handle(multi_handle, http_handle1);
  curl_multi_add_handle(multi_handle, http_handle2);
  curl_multi_add_handle(multi_handle, http_handle3);

  while(still_running) {
    (void) curl_multi_wait(multi_handle, NULL, 0, 1000, NULL);
    (void) curl_multi_perform(multi_handle, &still_running);
  }

  curl_multi_cleanup(multi_handle);

  curl_easy_cleanup(http_handle1);
  curl_easy_cleanup(http_handle2);
  curl_easy_cleanup(http_handle3);

  fprintf(stderr, "error1: '%s'\n", error1);
  fprintf(stderr, "error2: '%s'\n", error2);
  fprintf(stderr, "error3: '%s'\n", error3);

  return 0;
}