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curl/docs/libcurl/opts/CURLOPT_DNS_USE_GLOBAL_CACHE.3

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+.\" **************************************************************************
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+.\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <[email protected]>, et al.
+.\" *
+.\" * This software is licensed as described in the file COPYING, which
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+.\" **************************************************************************
+.\"
+.TH CURLOPT_DNS_USE_GLOBAL_CACHE 3 "November 04, 2020" "libcurl 7.75.0" "curl_easy_setopt options"
+
+.SH NAME
+CURLOPT_DNS_USE_GLOBAL_CACHE \- enable/disable global DNS cache
+.SH SYNOPSIS
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_USE_GLOBAL_CACHE,
+                          long enable);
+.SH DESCRIPTION
+Has no function since 7.62.0. Do not use!
+
+Pass a long. If the \fIenable\fP value is 1, it tells curl to use a global DNS
+cache that will survive between easy handle creations and deletions. This is
+not thread-safe and this will use a global variable.
+
+\fBWARNING:\fP this option is considered obsolete. Stop using it. Switch over
+to using the share interface instead! See \fICURLOPT_SHARE(3)\fP and
+\fIcurl_share_init(3)\fP.
+.SH DEFAULT
+0
+.SH PROTOCOLS
+All
+.SH EXAMPLE
+.nf
+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);
+}
+.fi
+.SH AVAILABILITY
+Deprecated since 7.62.0. Has no function.
+.SH RETURN VALUE
+Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not.
+.SH "SEE ALSO"
+.BR CURLOPT_SHARE "(3), " CURLOPT_DNS_CACHE_TIMEOUT "(3), "