---
name: "CURLOPT_DNS_USE_GLOBAL_CACHE"
section: "3"
platform: "macos"
package: "curl"
version: "166.0.0.0.1"
release: "macOS 26.5"
platforms: ["linux", "macos"]
url: "https://new.carta.tech/CURLOPT_DNS_USE_GLOBAL_CACHE"
---

# CURLOPT\_DNS\_USE\_GLOBAL\_CACHE(3)

global DNS cache

## 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)](/CURLOPT_SHARE/3.md)* and *[curl\_share\_init(3)](/curl_share_init/3.md)* for the correct way to share DNS cache between transfers.

## DEFAULT

0

## PROTOCOLS

All

## 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);
  }
}
```

## AVAILABILITY

Deprecated since 7.11.1. Function removed in 7.62.0.

## RETURN VALUE

Returns CURLE\_OK if the option is supported, and CURLE\_UNKNOWN\_OPTION if not.

## SEE ALSO

[**CURLOPT\_DNS\_CACHE\_TIMEOUT**(3)](/CURLOPT_DNS_CACHE_TIMEOUT/3.md), [**CURLOPT\_SHARE**(3)](/CURLOPT_SHARE/3.md)