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79 lines
2.8 KiB
Groff
79 lines
2.8 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 curl_easy_duphandle 3 "19 Sep 2014" "libcurl" "libcurl"
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.SH NAME
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curl_easy_duphandle - Clone a libcurl session handle
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.SH SYNOPSIS
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.nf
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#include <curl/curl.h>
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CURL *curl_easy_duphandle(CURL *handle);
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.fi
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.SH DESCRIPTION
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This function returns a new curl handle, a duplicate, using all the options
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previously set in the input curl \fIhandle\fP. Both handles can subsequently
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be used independently and they must both be freed with
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\fIcurl_easy_cleanup(3)\fP.
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Any options that the input handle has been told to point to (as opposed to
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copy) with previous calls to \fIcurl_easy_setopt(3)\fP, are pointed to by the
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new handle as well. You must therefore make sure to keep the data around until
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both handles have been cleaned up.
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The new handle does \fBnot\fP inherit any state information, no connections,
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no SSL sessions and no cookies. It also does not inherit any share object
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states or options (created as if \fICURLOPT_SHARE(3)\fP was set to NULL).
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If the source handle has HSTS or alt-svc enabled, the duplicate gets data read
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data from the main file name to populate the cache.
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In multi-threaded programs, this function must be called in a synchronous way,
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the input handle may not be in use when cloned.
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.SH EXAMPLE
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.nf
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int main(void)
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{
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CURL *curl = curl_easy_init();
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if(curl) {
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CURLcode res;
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CURL *nother;
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curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
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nother = curl_easy_duphandle(curl);
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res = curl_easy_perform(nother);
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curl_easy_cleanup(nother);
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curl_easy_cleanup(curl);
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}
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}
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.fi
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.SH AVAILABILITY
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Added in 7.9
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.SH RETURN VALUE
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If this function returns NULL, something went wrong and no valid handle was
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returned.
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.SH SEE ALSO
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.BR curl_easy_cleanup (3),
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.BR curl_easy_init (3),
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.BR curl_easy_reset (3),
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.BR curl_global_init (3)
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