118 lines
3.3 KiB
Markdown
118 lines
3.3 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
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SPDX-License-Identifier: curl
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Title: CURLSHOPT_SHARE
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Section: 3
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Source: libcurl
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See-also:
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- CURLSHOPT_UNSHARE (3)
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- curl_share_cleanup (3)
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- curl_share_init (3)
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- curl_share_setopt (3)
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---
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# NAME
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CURLSHOPT_SHARE - add data to share
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# SYNOPSIS
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~~~c
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#include <curl/curl.h>
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CURLSHcode curl_share_setopt(CURLSH *share, CURLSHOPT_SHARE, long type);
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~~~
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# DESCRIPTION
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The *type* parameter specifies what specific data that should be shared
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and kept in the share object that was created with curl_share_init(3).
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The given *type* must be be one of the values described below. You can set
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CURLSHOPT_SHARE(3) multiple times with different data arguments to have
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the share object share multiple types of data. Unset a type again by setting
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CURLSHOPT_UNSHARE(3).
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## CURL_LOCK_DATA_COOKIE
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Cookie data is shared across the easy handles using this shared object. Note
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that this does not activate an easy handle's cookie handling. You can do that
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separately by using CURLOPT_COOKIEFILE(3) for example.
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## CURL_LOCK_DATA_DNS
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Cached DNS hosts are shared across the easy handles using this shared
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object. Note that when you use the multi interface, all easy handles added to
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the same multi handle share DNS cache by default without using this option.
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## CURL_LOCK_DATA_SSL_SESSION
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SSL session IDs are shared across the easy handles using this shared
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object. This reduces the time spent in the SSL handshake when reconnecting to
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the same server. Note SSL session IDs are reused within the same easy handle
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by default. Note this symbol was added in 7.10.3 but was not implemented until
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7.23.0.
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## CURL_LOCK_DATA_CONNECT
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Put the connection cache in the share object and make all easy handles using
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this share object share the connection cache.
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It is not supported to share connections between multiple concurrent threads.
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Connections that are used for HTTP/1.1 Pipelining or HTTP/2 multiplexing only
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get additional transfers added to them if the existing connection is held by
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the same multi or easy handle. libcurl does not support doing HTTP/2 streams
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in different threads using a shared connection.
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Support for **CURL_LOCK_DATA_CONNECT** was added in 7.57.0, but the symbol
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existed before this.
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Note that when you use the multi interface, all easy handles added to the same
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multi handle shares connection cache by default without using this option.
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## CURL_LOCK_DATA_PSL
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The Public Suffix List stored in the share object is made available to all
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easy handle bound to the later. Since the Public Suffix List is periodically
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refreshed, this avoids updates in too many different contexts.
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Added in 7.61.0.
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Note that when you use the multi interface, all easy handles added to the same
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multi handle shares PSL cache by default without using this option.
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## CURL_LOCK_DATA_HSTS
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The in-memory HSTS cache.
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It is not supported to share the HSTS between multiple concurrent threads.
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Added in 7.88.0
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# PROTOCOLS
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All
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# EXAMPLE
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~~~c
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int main(void)
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{
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CURLSHcode sh;
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CURLSH *share = curl_share_init();
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sh = curl_share_setopt(share, CURLSHOPT_SHARE, CURL_LOCK_DATA_COOKIE);
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if(sh)
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printf("Error: %s\n", curl_share_strerror(sh));
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}
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~~~
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# AVAILABILITY
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Added in 7.10
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# RETURN VALUE
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CURLSHE_OK (zero) means that the option was set properly, non-zero means an
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error occurred. See libcurl-errors(3) for the full list with
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descriptions.
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