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CURLOPT_DNS_USE_GLOBAL_CACHE

Section: C Library Functions (3)
Updated: 202-0-19
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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

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, threa-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).