CURLOPT_DNS_USE_GLOBAL_CACHE(3)                       Library Functions Manual

NAME
       CURLOPT_DNS_USE_GLOBAL_CACHE - global DNS cache

SYNOPSIS
       #include <curl/curl.h>

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

DESCRIPTION
       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 survives between easy handle creations and deletions.
       This is not thread-safe and this uses a global variable.

       See CURLOPT_SHARE(3) and curl_share_init(3) for the correct way to
       share DNS cache between transfers.

DEFAULT
       0

PROTOCOLS
       This functionality affects all supported protocols

EXAMPLE
       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           CURLcode result;
           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);
           result = curl_easy_perform(curl);
           curl_easy_cleanup(curl);
         }
       }


DEPRECATED
       Deprecated since 7.11.1. Functionality removed in 7.62.0.

AVAILABILITY
       Added in curl 7.9.3

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).

SEE ALSO
       CURLOPT_DNS_CACHE_TIMEOUT(3), CURLOPT_SHARE(3)

libcurl                           2026-09-02   CURLOPT_DNS_USE_GLOBAL_CACHE(3)