69 lines
3.0 KiB
Groff
69 lines
3.0 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" * SPDX-License-Identifier: curl
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.\" *
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.\" **************************************************************************
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.TH libcurl-share 3 "August 22, 2023" "libcurl 8.3.0" "libcurl"
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.SH NAME
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libcurl-share \- how to use the share interface
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.SH DESCRIPTION
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This is an overview on how to use the libcurl share interface in your C
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programs. There are specific man pages for each function mentioned in
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here.
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All functions in the share interface are prefixed with curl_share.
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.SH "OBJECTIVES"
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The share interface was added to enable sharing of data between curl
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\&"handles".
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.SH "ONE SET OF DATA - MANY TRANSFERS"
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You can have multiple easy handles share data between them. Have them update
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and use the \fBsame\fP cookie database, DNS cache, TLS session cache and/or
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connection cache! This way, each single transfer takes advantage from data
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updates made by the other transfer(s).
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.SH "SHARE OBJECT"
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You create a shared object with \fIcurl_share_init(3)\fP. It returns a handle
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for a newly created one.
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You tell the shared object what data you want it to share by using
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\fIcurl_share_setopt(3)\fP.
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Since you can use this share from multiple threads, and libcurl has no
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internal thread synchronization, you must provide mutex callbacks if you are
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using this multi-threaded. You set lock and unlock functions with
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\fIcurl_share_setopt(3)\fP too.
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Then, you make an easy handle to use this share, you set the
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\fICURLOPT_SHARE(3)\fP option with \fIcurl_easy_setopt(3)\fP, and pass in
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share handle. You can make any number of easy handles share the same share
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handle.
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To make an easy handle stop using that particular share, you set
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\fICURLOPT_SHARE(3)\fP to NULL for that easy handle. To make a handle stop
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sharing a particular data, you can \fICURLSHOPT_UNSHARE\fP it.
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When you are done using the share, make sure that no easy handle is still using
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it, and call \fIcurl_share_cleanup(3)\fP on the handle.
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.SH "SEE ALSO"
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.BR curl_share_init "(3), " curl_share_setopt "(3), " curl_share_cleanup "(3)"
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.BR libcurl-errors "(3), " libcurl-easy "(3), " libcurl-multi "(3) "
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