curl / libcurl / API / curl_easy_setopt / CURLOPT_DNS_USE_GLOBAL_CACHE

CURLOPT_DNS_USE_GLOBAL_CACHE explained

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 and curl_share_init for the correct way to share DNS cache between transfers.

Default

Protocols

This functionality affects all supported protocols

Example

int main(void)
{
  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

Deprecated since 7.11.1. Functionality removed in 7.62.0.

Availability

Added in curl 7.9.3

Return value

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