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112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* 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.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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***************************************************************************/
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/* <DESC>
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* using the multi interface to do a single download
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* </DESC>
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*/
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#include <stdio.h>
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#include <string.h>
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/* somewhat unix-specific */
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#include <sys/time.h>
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#include <unistd.h>
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/* curl stuff */
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#include <curl/curl.h>
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#ifdef _WIN32
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#define WAITMS(x) Sleep(x)
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#else
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/* Portable sleep for platforms other than Windows. */
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#define WAITMS(x) \
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struct timeval wait = { 0, (x) * 1000 }; \
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(void)select(0, NULL, NULL, NULL, &wait)
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#endif
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/*
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* Simply download a HTTP file.
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*/
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int main(void)
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{
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CURL *http_handle;
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CURLM *multi_handle;
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int still_running = 0; /* keep number of running handles */
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int repeats = 0;
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curl_global_init(CURL_GLOBAL_DEFAULT);
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http_handle = curl_easy_init();
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/* set the options (I left out a few, you'll get the point anyway) */
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curl_easy_setopt(http_handle, CURLOPT_URL, "https://www.example.com/");
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/* init a multi stack */
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multi_handle = curl_multi_init();
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/* add the individual transfers */
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curl_multi_add_handle(multi_handle, http_handle);
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/* we start some action by calling perform right away */
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curl_multi_perform(multi_handle, &still_running);
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while(still_running) {
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CURLMcode mc; /* curl_multi_wait() return code */
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int numfds;
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/* wait for activity, timeout or "nothing" */
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mc = curl_multi_wait(multi_handle, NULL, 0, 1000, &numfds);
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if(mc != CURLM_OK) {
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fprintf(stderr, "curl_multi_wait() failed, code %d.\n", mc);
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break;
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}
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/* 'numfds' being zero means either a timeout or no file descriptors to
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wait for. Try timeout on first occurrence, then assume no file
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descriptors and no file descriptors to wait for means wait for 100
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milliseconds. */
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if(!numfds) {
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repeats++; /* count number of repeated zero numfds */
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if(repeats > 1) {
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WAITMS(100); /* sleep 100 milliseconds */
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}
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}
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else
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repeats = 0;
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curl_multi_perform(multi_handle, &still_running);
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}
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curl_multi_remove_handle(multi_handle, http_handle);
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curl_easy_cleanup(http_handle);
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curl_multi_cleanup(multi_handle);
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curl_global_cleanup();
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return 0;
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}
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