CURLOPT_DNS_USE_GLOBAL_CACHE - Man Page

#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_USE_GLOBAL_CACHE,
                          long enable);

Has no function since 7.62.0. Do not use!

Pass a long. If the enable value is 1, it tells curl to use a global DNS cache that will survive between easy handle creations and deletions. This is not thread-safe and this will use a global variable.

WARNING: this option is considered obsolete. Stop using it. Switch over to using the share interface instead! See CURLOPT_SHARE(3) and curl_share_init(3).

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CURL *curl = curl_easy_init();
if(curl) {
  CURLcode ret;
  curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/");
  /* switch off the use of a global, thread unsafe, cache */
  curl_easy_setopt(curl, CURLOPT_DNS_USE_GLOBAL_CACHE, 0L);
  ret = curl_easy_perform(curl);
  curl_easy_cleanup(curl);
}

Deprecated since 7.11.1. Function removed in 7.62.0.

Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.

CURLOPT_SHARE(3), CURLOPT_DNS_CACHE_TIMEOUT(3),

curl_easy_setopt(3), curl_multi_add_handle(3), CURLOPT_DNS_CACHE_TIMEOUT(3), libcurl-thread(3).