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CURLOPT_DNS_USE_GLOBAL_CACHE: remove

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Remove the code too. The functionality has been disabled in code since
7.62.0. Setting this option will from now on simply be ignored and have
no function.

Closes #3654
This commit is contained in:
Daniel Stenberg 2019-03-07 15:39:43 +01:00
parent ebc0550110
commit f73de32d46
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9 changed files with 35 additions and 119 deletions
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20
docs/DEPRECATE.md
View file

@ -5,26 +5,6 @@ email the curl-library mailing list as soon as possible and explain to us why
this is a problem for you and how your use case can't be satisfied properly
using a work around.
## `CURLOPT_DNS_USE_GLOBAL_CACHE`
This option makes libcurl use a global non-thread-safe cache for DNS if
enabled. The option has been marked as "obsolete" in the header file and in
documentation for several years already.
There's proper and safe method alternative provided since many years: the
share API.
### State
In curl 7.62.0 setting this option to TRUE will not have any effect. The
global cache will not be enabled. The code still remains so it is easy to
revert if need be.
### Removal
Remove all global-cache related code from curl around April 2019 (might be
7.66.0).
## HTTP/0.9
Supporting this is non-obvious and might even come as a surprise to some

6
docs/libcurl/opts/CURLOPT_DNS_USE_GLOBAL_CACHE.3
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@ -5,7 +5,7 @@
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" * Copyright (C) 1998 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
.\" *
.\" * This software is licensed as described in the file COPYING, which
.\" * you should have received as part of this distribution. The terms
@ -29,6 +29,8 @@ CURLOPT_DNS_USE_GLOBAL_CACHE \- enable/disable global DNS cache
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_DNS_USE_GLOBAL_CACHE,
long enable);
.SH DESCRIPTION
Has no function since 7.62.0. Do note 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.
@ -53,7 +55,7 @@ if(curl) {
}
.fi
.SH AVAILABILITY
Subject for removal in the future. Do not use!
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"