c: Copyright (C) Daniel Stenberg, <daniel.se>, et al. SPDX-License-Identifier: curl Title: CURLOPT_DNS_USE_GLOBAL_CACHE Section: 3 Source: libcurl See-also:
CURLOPT_DNS_USE_GLOBAL_CACHE - global DNS cache
#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 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.
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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 since 7.11.1. Function removed in 7.62.0.
Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.